Carpentry and Construction

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Stair Calculator - Risers, runs, and headroom from total rise.
Roof Pitch - Pitch as fraction, degrees, and percent.
Rafter Length - Rafter length from span, pitch, overhang.
Square Footage - Area for rectangle, triangle, trapezoid, circle.
Lumber Board Footage - Total board feet from thickness, width, length, count.
Concrete Volume - Cubic yards for slab, footing, column, footing-with-stem.
Shotcrete / Gunite Order Quantity with Rebound - Cubic yards of shotcrete or gunite to order once rebound (the fraction that bounces off and never stays) is grossed up.
Rebar Spacing and Quantity - Linear feet of rebar from slab dimensions and spacing.
Lumber Spans - Maximum span from species, grade, size, load.
Nail and Screw Pull-Out - Typical pull-out resistance by fastener and species.
Beam Loading - Moment and deflection for simply supported beams.
Material Quantity - Quantity for common assemblies with waste factor.
Stair Stringer Length - Diagonal stringer length and 2x12 board feet from rise and run.
Joist Mid-Span Deflection - Mid-span deflection with L/360 and L/240 checks.
Footing Area for Soil Bearing - Required footing area and side dimension by soil class.
Tile Count and Grout Volume - Tile count with waste and grout cubic-inch estimate.
Paint Coverage - Gallons per coat by surface porosity and coats.
Excavation Volume - Cubic yards of soil for a sloped excavation.
Brick and CMU Count - Unit count from wall area, unit size, and mortar joint.
Wind Velocity Pressure - The wind pressure on a wall or roof at a design wind speed.
Basic Wind Speed from Velocity Pressure - The equivalent basic wind speed behind a bare velocity pressure.
Flat-Roof Snow Load - The design snow load on a flat roof, from the ground snow load for the site.
Anchor Bolt Embedment - Required embedment depth from public bond strength formula.
Corner Bead / Drywall Trim Takeoff - Corner bead and drywall trim takeoff: one full-height bead per outside corner.
Drywall Sheet Count and Mud - Sheets, mud gallons, tape lf, and screws from wall and ceiling area.
Roofing Squares and Bundles - Squares, bundles per shingle product, underlayment rolls, drip edge.
Asphalt Tonnage - Tons of mix and truck loads at typical 20 tons per haul.
Asphalt Paver Speed and Production Rate - Tons per hour and lane-feet per hour a paver lays at a given screed width, depth, and forward speed.
Chip Seal Design by the McLeod Method - Chip seal aggregate and binder spread rates by the McLeod method.
Asphalt Tack / Prime Coat Quantity - Emulsion gallons to order for a tack or prime coat.
Aggregate / Gravel Cubic Yards - Cubic yards and tons from area, depth, and material density.
Conical Stockpile Volume and Tonnage - Volume (cy) and tonnage of a free-standing conical stockpile from its base diameter, angle of repose, and bulk density.
Mortar Mix and Yield - Bags of mortar mix from brick / CMU count and joint thickness.
Concrete Mix Design (Simplified) - Water-to-cement ratio interpolated from ACI 211-style curves; cement, coarse, fine aggregate per cubic yard.
Bolt Torque to Clamp Load - Short-form torque T = K * D * F with grade proof loads.
Sheet Metal Bend Allowance - Bend allowance and flat blank length from K-factor and angle.
Coil / Roll Stock Length - How much strip is left on the coil without unrolling it.
Sheet-Metal Gauge to Decimal Thickness - The decimal thickness of a sheet-metal or plate gauge, which differs by MATERIAL.
Mixed-Length Bar Nesting (Cutting Stock) - What barstock-cutlist says it does not do.
Bar / Tube Stock Cut List Yield - How many cut pieces come off a stick of bar, tube, or angle and how many sticks to buy, with the saw kerf counted.
Dished Tank / Vessel Head Volume - The liquid volume of one dished tank head (the bulge past the tangent line), plus any straight-flange skirt.
Multi-Bend Flat Pattern (Developed Length) - The flat blank length for a sheet-metal part with several bends.
Shop Speeds and Feeds - Spindle RPM and feed rate from SFM and chipload by tool / material.
Welding Rod and Wire Usage - Deposit weight, consumable weight, time, and shielding gas by process.
Demolition Debris Weight - Tons of debris and recommended dumpster size by structure type.
Formwork Pressure - Lateral form pressure (ACI 347 short form) capped at wet head.
Concrete Pour Rate, Rate of Rise, and Delivery Cadence - How fast concrete rises in the forms at a given placement rate, plus pour time and truck cadence.
Residential Framing Package - Stud + plate + joist + rafter rollup with board-feet totals from footprint, perimeter, wall height, joist span.
Excavation Slope and Bench-Step Plan - OSHA Appendix B slope ratios A 0.75:1 / B 1:1 / C 1.5:1 turned into spoil volume (yd^3), surface footprint.
Window / Door Header Sizing (IRC R602.7) - Smallest built-up dimension-lumber header (double / triple 2x6-2x12) from tributary load, span, snow, and species.
Wall Stud Notching and Boring Limits (IRC R602.6) - The 'can I drill or notch this stud' field check on the actual stud width.
Floor Joist Notching and Boring Limits (IRC R502.8.1) - The 'where can I notch or drill this floor joist' field check on the actual joist depth (sawn lumber).
Joist / Deck Cantilever Ratio Check (IRC R507.6) - The 1:4 deck rule: a joist may overhang its support by a quarter of its backspan.
Deck Beam and Post Sizing (IRC R507) - Deck beam ply and size, post size (4x4 / 6x6) from an NDS column check, footing size from soil bearing.
Braced-Wall-Panel Length (IRC R602.10) - Required braced-panel length (bracing percent x wall-line length), provided vs. required, and a pass/fail.
Deck Ledger Fastener Spacing (IRC R507.9) - On-center spacing, fasteners for the ledger length, and a span/table check.
Stair Stringer Layout (with code check) - Riser count, exact rise, total run, stringer hypotenuse, throat depth.
Hip / Valley / Jack Rafter Schedule - Common-rafter and hip multipliers, jack-rafter shortening per OC, irregular-hip second pitch handling.
Rebar Bend and Weight Schedule - Cut length with bend allowance and total weight by bar size from the bundled #3-#11 unit weights.
Welded-Wire Reinforcement (Mesh) Sheet Takeoff - Sheets of welded-wire reinforcement (mesh / WWF) for a slab once the side and end laps eat coverage.
Plywood and OSB Sheathing Span Rating - Allowable spacing / live load / total load from APA span-rating tables; pass/fail against user-supplied design loads.
Helical Pile Torque-to-Capacity - Ultimate axial capacity from torque × Kt and allowable from factor of safety.
Helical Pile Acceptance Torque for a Target Capacity - The installation torque a helical pile must reach to confirm a target capacity.
Crane Lift Plan Quick-Math - Gross load, sling tension, percent of chart, and 75 / 90 percent flag.
Bearing Length on a Wood Plate - Required bearing length and actual compression-perpendicular-to-grain stress for a point load on a wood plate.
Wood Column Capacity (Slenderness) - Slenderness ratio, column stability factor Cp, allowable Fc-prime.
Simple-Span Beam Reactions and Max Moment - Reactions, max shear, and max moment for a simple-span beam under uniform and point loads.
Welding Heat Input - Heat input in kJ/in and kJ/mm from volts, amps, travel speed, and arc efficiency, with WPS pass/fail.
Metal Weight by Shape and Alloy - Weight per piece and total by shape, dimensions, length, and alloy density.
Layout Squaring (3-4-5) - Diagonal to pull and out-of-square diagnosis for a rectangular layout.
Horizontal Curve Layout - Tangent, length, external, middle ordinate, chord, and PC/PT stations for a circular curve.
Spiral (Transition) Curve Layout - The transition (clothoid) curve between a tangent and a circular curve.
Compound Circular Curve - Two circular arcs of different radii turning the same way, meeting at a point of compound curvature (PCC).
Reverse (S) Curve Between Parallel Tangents - Two opposite arcs that shift an alignment onto a parallel line, like a crossover or lane shift.
Curve Deflection-Angle Stakeout - How to set a circular curve in the field by deflection angles.
Vertical Curve Elevations - Equal-tangent parabolic elevations and the high or low point of a vertical curve.
Earthwork Volume (End-Area) - Average-end-area and prismoidal earthwork volume in cubic feet and yards.
Slope-Stake Cut and Fill - Cut or fill depth and the catch-point offset for a planar design slope.
Superelevation / Min Curve Radius (AASHTO) - AASHTO point-mass e + f = V^2/(15 R): required superelevation for a radius, or the minimum radius at a maximum bank.
Safe Curve Speed from Radius and Superelevation - The maximum safe speed a curve supports from its radius, superelevation (bank), and side-friction factor.
Crest Vertical Curve Length for SSD (AASHTO) - AASHTO minimum crest vertical-curve length L for a stopping sight distance, both S<=L and S>L branches, with the K rate.
Sag Vertical Curve Length for Headlight SSD (AASHTO) - The minimum length of a sag (valley) vertical curve, which at night is limited by headlight reach.
Sag Vertical Curve Comfort and Drainage (AASHTO) - The comfort and drainage limits on a sag vertical curve - the two controls beyond headlight sight distance.
Horizontal Sightline Offset on a Curve (AASHTO) - How far back an inside obstruction must sit on a curve for stopping sight distance.
Fillet Weld Strength and Size - Throat, ASD/LRFD shear capacity, utilization.
Intermittent Fillet Weld Schedule (AISC J2 / AWS) - When a required continuous fillet is smaller than the practical minimum weld.
Groove Weld Strength - CJP / PJP groove-weld shear capacity on the effective throat (ASD / LRFD).
Groove Weld Length for an Applied Load - The weld length an applied load needs at a given effective throat.
Press-Brake Air-Bend Tonnage - Air-bend press-brake tonnage from thickness, bend length, V-die opening, and tensile strength.
Press-Brake Max Bendable Thickness - The thickest material a press can air-bend.
Welder Duty Cycle - Allowable welder duty cycle at a target amperage from the rated amperage and duty cycle.
Carbon Equivalent and Preheat Screen - IIW carbon equivalent CE = C + Mn/6 + (Cr + Mo + V)/5 + (Ni + Cu)/15 from the steel chemistry.
Shielding-Gas Cylinder Runtime and Cost - Gas used, runtime per cylinder, cylinders needed, and the prorated gas cost from a flow setting and arc-on time.
Compressed Gas Cylinder Storage Separation (OSHA 1926.350) - The rule everyone half-remembers as "20 feet" is an OR, and the alternative is usually cheaper.
Oxy-Fuel Cutting Gas Consumption - Cut time, oxygen and fuel consumed, and runtime per cylinder for an oxy-fuel cut from the tip flows, cut length.
Weld Preheat Energy and Fuel - Heat needed, fuel energy after efficiency.
All-In Welding Cost per Foot - Consumable per foot, filler cost, labor hours and cost, and the all-in cost per foot of weld.
Weld Deposit Weight, Filler, and Pass Count - Weld cross-section, deposit weight, filler purchased after deposition efficiency.
Wire Feed Speed to Deposition Rate - Melt-off rate from wire feed speed and electrode diameter, and the deposition rate after spatter loss.
Wire Feed Speed for a Target Deposition Rate - The wire feed speed a target deposition rate needs.
Weld Transverse Shrinkage and Pre-Set - Transverse shrinkage per weld and total pull from the Blodgett relation (0.2 x weld area / thickness).
Eccentric Fillet Weld Group (Elastic Method) - Line polar moment, direct shear, torsional components, the resultant unit force at the critical corner.
Minimum Plate Bend Radius - Minimum inside bend radius and radius-to-thickness multiple to avoid cracking the outer fiber.
Sheet-Metal Bend Springback - How much a sheet-metal bend springs OPEN when the tooling releases.
Weld Dilution Ratio - Weld dilution = melted base-metal area / total deposit area, the base-metal fraction of the deposit.
Diluted Weld Deposit Composition - The as-deposited content of one alloy element after dilution.
Weld Passes and Arc Time to Fill a Groove - How many passes fill a groove, and the arc time and wire that takes.
Weld Travel Speed for a Target Heat Input - Travel speed TS = (60 V I eta)/(1000 HI) to hold a target heat input.
Compound Miter (Crown Molding) - Saw settings to cut crown molding flat on the table.
Curtain Wall Mullion Deflection and Required Stiffness - The stiffness a curtain wall mullion needs to hold its deflection limit.
Windrow (Elongated) Stockpile Volume and Tonnage - Volume (cy) and tonnage of an ELONGATED stockpile - a windrow dumped or graded along a line.
Flat-Top (Truncated-Cone) Stockpile Volume and Tonnage - Volume and tonnage of a flat-topped stockpile, the truncated cone a stacker leaves.
Tube Bend Wall Thinning and Bend Ratio - How much a tube's outside wall thins in a bend, and the two ratios that decide whether the bend is makeable.
Weld Cooling Time and the Thickness Transition - The cooling time through the 800 to 500 degree Celsius window.
Interpass Temperature Window and Time Between Passes - How long a welder can stop before a joint needs reheating, and how long to wait after a pass that ran hot.
Soil Swell / Shrinkage Volume Conversion - Convert bank cubic yards to loose (truck) and compacted (placed) volume.
RUSLE Annual Soil Loss - Tons per acre per year a disturbed site sheds by the USDA public-domain RUSLE method.
Riprap Median Stone Size (Isbash) - Median stone size D50 to armor a channel or outlet against a scouring velocity by the public-domain Isbash equation.
Riprap Layer Volume and Tonnage - Cubic yards and tons of stone to order for a riprap layer.
Silt Fence Drainage-Area and Length Check - Whether a silt fence is long enough for the drainage area behind it.
Rock Check Dam Spacing - Spacing between rock check dams in a channel or swale, where the toe of each upper dam sits at the crest of the next.
Sediment Basin / Trap Storage Volume - Settling storage a construction general permit requires per disturbed acre.
Erosion Blanket (RECP) Roll and Staple Takeoff - Rolls and staples to order for a slope erosion-control blanket (RECP), where the side/end overlap drives the roll count.
Hydroseed Slurry Mix and Tank Count - Seed, mulch, and tackifier solids for a hydroseed job and the tank loads to shoot it.
Stabilized Construction Entrance Stone - Cubic yards and tons of coarse stone for a stabilized construction entrance (track-out BMP).
Buried Pipe Flotation and Anti-Flotation Backfill - Flotation check for an empty large-diameter pipe in a flooded trench.
Restrained-Joint Length at a Pipe Bend - Run of restrained pipe each side of a bend that holds the thrust when a concrete block will not fit.
HDD Pullback Force First-Order Estimate - First-order force to draw a product pipe back through a horizontal directional bore (ASTM F1962 basis).
Dust-Control Watering Volume and Truck Trips - Gallons a water truck spreads on a haul road and the trips to keep the fugitive-dust permit satisfied.
Haul-Road Total Resistance and Required Rimpull - The resistance a loaded hauler fights and the rimpull to climb it.
Dump Truck Governing Payload and Load Count - Whether the box volume or the legal weight limit fills the truck first, and the load count.
Earthwork Production Unit Cost - Joins the equipment hourly rate to the hourly production into the unit cost a bid needs.
Soil Stabilization (Lime / Cement) Quantity - Lime or cement takeoff for subgrade stabilization from a percent-by-dry-weight mix design.
Buried Flexible Pipe Deflection (Modified Iowa) - How much a plastic or thin-wall pipe ovals under its soil load, by the public-domain Modified Iowa formula.
Asphalt Spread Rate and Yield Check - The spread rate (lb/sy) a mat lays and the yield (sy/ton) a paving crew checks load by load.
Cold-Planing (Milling) Production and RAP Tonnage - Square yards per hour a cold planer cuts and the reclaimed-asphalt (RAP) tonnage it makes, which sizes the haul fleet.
Pavement Marking Paint and Glass Bead Quantity - Paint and glass beads for a pavement-marking run.
Work Zone Advance Warning Sign Spacing (MUTCD 6C-1) - How far ahead of a work-zone taper the advance warning signs go, per MUTCD Table 6C-1.
Work-Zone Merging Taper Length and Device Count (MUTCD) - MUTCD merging-taper length for a lane closure and the channelizing devices it takes.
Siding Course Layout (Story Pole) - Divides a wall into whole siding courses so the top course lands full, not a sliver.
Lap / Panel Siding Squares and Linear Footage - Siding takeoff: net wall area after openings, the squares with waste, and the lap linear footage at a reveal.
Portland-Cement Plaster (Stucco) Material Takeoff - Bags of portland-cement plaster for a multi-coat thickness over an area.
Under-Slab Vapor Barrier Rolls and Seam Tape - Poly vapor-barrier rolls for a slab (with lap and waste) and the seam tape.
Concrete Control-Joint Saw-Cut Footage - Saw-cut linear feet for the control-joint grid a slab implies.
Foundation Waterproofing / Dampproofing Takeoff - The fluid-applied waterproofing or dampproofing to coat a below-grade foundation wall.
Foundation Drainage Board (Dimple Mat) Takeoff - Dimpled drainage board to cover a below-grade foundation wall, ordered by the roll.
Ballasted Roof Ballast Weight and Order - The weight and order quantity of loose ballast on a ballasted single-ply (EPDM / TPO) low-slope roof.
Concrete Curing Compound Coverage - Gallons of liquid membrane-forming curing compound (ASTM C309) for a slab.
Concrete Isolation-Joint Filler Takeoff - Isolation-joint filler around a slab where it abuts rigid elements, so it can move freely.
Concrete Stair / Stoop Volume Takeoff - The ready-mix volume of a poured stair or stoop = the stepped wedge plus the raking waist slab.
Slab Load-Transfer Dowel Schedule (ACI 302) - The smooth, GREASED load-transfer dowels for a jointed slab-on-grade, per ACI 302 detailing.
Joist Hanger and Connector-Nail Count - Joist hangers and the connector nails that fill them.
Drywall Screw Fastener Takeoff - Drywall screws from the framing spacing and the field pattern.
Glass Weight and Suction-Cup Lifter Count - Glass weight and the suction-cup lifter count it takes.
Polymeric Paver Joint Sand Bag Count - Bags of polymeric joint sand for a paver area, with waste.
Rigid / Continuous Insulation Board Count - Rigid continuous-insulation boards (XPS, polyiso, EPS) for an area, with waste and layers.
Roof Board Fastener and Plate Count by Zone - Fasteners and plates for mechanically-attached roof insulation, by wind-uplift zone.
Housewrap (WRB) Rolls, Cap Fasteners, and Seam Tape - Housewrap (weather-resistive barrier) takeoff.
Chain-Link Fabric, Post, and Tension-Band Takeoff - The fabric, posts, rails, and fittings a chain-link run takes off to.
Curb-and-Gutter Concrete Volume - Concrete for a curb-and-gutter run, a linear per-station pour of a fixed cross-section.
Rebar Chair / Bar-Support Count - Bar supports (chairs and bolsters) that hold rebar or mesh at the design cover.
Gutter LF and Downspout Count Takeoff - Gutter footage, downspout count, pipe, and hangers.
Soffit Vent and Ridge-Vent Count from Required NFA - Soffit vents and ridge-vent feet from the required net free area, split balanced intake / exhaust.
Internal Vibrator Spacing (ACI 309) - Spaces the internal-vibrator insertions that consolidate fresh concrete (ACI 309).
Formwork Stud / Wale Maximum Spacing - The stud, wale, and shore spacing a formwork member can span under the concrete pressure.
Formwork Tie Load and Spacing - Sizes the wall-form ties that take the lateral concrete pressure in tension.
Mass Concrete Adiabatic Temperature Rise Screen (ACI 207) - How hot a thick concrete placement will run, and whether it needs a cooling plan.
Concrete Washout Containment Volume - Sizes the lined pit that catches chute and pump rinse so slurry never reaches the ground.
Roofing Nail Count by Wind Zone - Field fasteners for an asphalt-shingle roof, where the wind zone drives the nailing pattern.
Roof Underlayment Roll Count - Field underlayment rolls over the whole deck.
Mechanically Attached Single-Ply Fastener and Plate Takeoff - Fasteners, plates, and cover tape for a mechanically attached membrane roof.
Single-Ply Membrane Roof Rolls and Seam Length - Rolls and seam length for a single-ply membrane (TPO/EPDM/PVC), where the side lap eats the usable width.
Tapered Roof Insulation Average Thickness and Quantity - Average thickness, board-feet, and average R for a slope-to-drain tapered layout.
Wall / Roof Sheathing Panel and Nail Takeoff - Sheathing panels and nails for a wall or roof.
Construction Adhesive Tube Count - Adhesive tubes for a subfloor or panel job, where the bead size sets the coverage.
Sill-Plate Anchor Bolt Count (IRC R403.1.6) - Lays out sill-plate anchor bolts at the IRC max spacing with a bolt near each end.
Light-Gauge Steel Stud and Track Takeoff - Light-gauge steel studs and track for a partition.
Suspended Acoustical Ceiling Grid Takeoff - Panels, tees, wall angle, and hanger wires for a lay-in acoustical ceiling (2x4 grid).
Masonry Control-Joint Layout - Lays out masonry control joints by the NCMA empirical rule.
Roll-Off Dumpster / Haul Count - Turns a demolition debris volume and weight into a haul count, where either the box volume or the weight cap governs.
Caulk / Sealant Cartridge Yield from Joint Size - How many linear feet a sealant cartridge does for a joint size, and the cartridges for a run.
Self-Leveling Underlayment Bag Count - Self-leveling underlayment (SLU) bags, where the yield depends on the average pour thickness.
Carpet Seam and Drop Layout - Where the seams land, which carpet-takeoff charges a flat waste percentage for and never computes.
Carpet Square-Yard and Linear-Foot Takeoff - Carpet in the units it is bought (square yards off a 12 ft roll), with higher waste for seam layout and pattern.
Spray Fireproofing (SFRM) Material Takeoff - Spray-applied fire-resistive material - the volume, weight, and bags at the design thickness.
Spray Foam Board-Feet and Set Count - Sizes spray foam in the board-feet and sets it is ordered by (a board-foot is one square foot one inch thick).
Steel Roof / Floor Deck Sheet Takeoff - Structural steel deck - sheets by net cover, and the side-lap run that sizes the fastening.
Rebar Tie-Wire Count and Weight - Tie wire for a rebar mat - the intersections tied and the wire consumed.
Adhesive-Anchor Epoxy Cartridge Volume - The epoxy to set adhesive anchors - the annular volume per hole and the cartridges.
Non-Shrink Grout Volume Under a Base Plate - Non-shrink grout under a column base plate - the gap volume minus the steel footprint, and the bags.
Guard Baluster / Picket Count (4-in Sphere Rule) - Balusters on a guard or fence spaced so a 4 in sphere cannot pass.
Galvanized Duct Sheet-Metal Weight Takeoff - Duct sheet-metal weight from the perimeter, run, and gauge - the number that sizes the coil order and the hangers.
Electrical Duct-Bank Concrete Encasement Volume - Concrete for an electrical duct bank - the encasement around a bundle of conduits.
Duct Wrap / Liner Material Takeoff - External duct-wrap insulation area and rolls, where the overlap and corner compression add to the bare surface.
Duct Hanger Load and Count - The weight each duct hanger carries at a chosen spacing and the count a run needs.
Haul-Cycle Production and Fleet Match - Truck cycle time, loads per hour, single-truck and matched-fleet production.
Wheel-Loader / Excavator Bucket Production Rate - Loose-yards-per-hour a wheel loader or excavator digs and dumps from the rated bucket capacity, fill factor.
Dozer Slot / Blade Production Rate - Loose-yards-per-hour a dozer pushes from the blade capacity, push distance, and push/return speeds.
Roller Compaction Production Rate - Surface coverage (sf/hr, sy/hr) and compacted cubic yards per hour a roller turns out from the drum width, speed.
Dozer Ripper Loosening Production Rate - Bank cubic yards per hour a dozer ripper loosens in place from the shank spacing, penetration.
Excavation Dewatering Pump Rate - Pump rate to draw an open excavation down in a target time and hold it against a steady inflow.
Trench Spoil Pile Setback and Surcharge - Required spoil-pile setback (the larger of the OSHA 2 ft minimum and the depth-based surcharge), the pile toe spread.
Trench Pipe Bedding and Backfill Take-Off - Bedding stone (cy and tons), pipe-zone embedment aggregate.
Coating Coverage from Volume-Solids and DFT - Theoretical and practical coverage, gallons.
Abrasive Blast Air and Abrasive Consumption - Nozzle air-flow (cfm), compressor horsepower, abrasive consumption (lb/hr).
Fence Material Takeoff - Section, post, rail, and picket counts for a straight fence run from the run length, post spacing, rails per section.
Concrete per Post Hole - The concrete a batch of post holes needs.
Bagged Concrete Count for a Small Pour - The bags of pre-mixed concrete for a small rectangular pour -- a pad, footing, curb, or equipment base.
Thin-Set Mortar Coverage - The bags of thin-set a tile job needs, sized off the trowel notch the way a setter buys it.
Cement Board (Tile Backer) Sheet and Screw Takeoff - Cement-board tile-backer sheets and fasteners for a tub surround, wall, or floor.
Roof Step-Flashing Piece Count - The step-flashing pieces for a roof-to-wall or chimney sidewall.
Resilient / LVP Flooring Takeoff - Boxes of plank or tile to order at the waste allowance for the install pattern (straight / diagonal / herringbone).
Concrete Control Joint Spacing - Where to cut contraction (control) joints in a slab.
Rebar Lap-Splice Length - The tension lap-splice length as a multiple of the bar diameter (the jobsite 40-48 bar-diameter rule).
Paver Patio Takeoff - Pavers to order with a cut allowance from the patio area and paver face.
SRW Geogrid Layer Spacing and Layout - The maximum vertical spacing between geogrid layers in a segmental retaining wall.
Segmental Retaining Wall Takeoff - Blocks per course and number of courses (with the buried first course), total and cap blocks.
Crawl Space (Under-Floor) Ventilation Net Free Area - attic-ventilation does the roof; nothing did the floor.
Attic Ventilation Net Free Area - The net free vent area an attic needs (the IRC 1/150 rule, or 1/300 balanced with a vapor retarder).
Powered Attic Ventilator Sizing - The fan size and matching intake for a powered attic ventilator.
Gutter and Downspout Sizing - The gutter size and number of downspouts a roof needs.
Deck Board and Fastener Takeoff - The decking surface takeoff a deck builder orders from.
Stone Countertop Overhang Support Check - Whether a bar or island overhang needs corbels, by the two rules the stone-industry guidance always states together.
Valley Flashing Takeoff (Metal, Pieces, Ice Barrier) - The valley flashing metal a roof needs, in linear feet and rolls.
Roof Drip Edge Rake / Eave Split and Piece Count - roofing-squares returns drip edge as a bare passthrough of the perimeter, which hides the thing that matters.
Kitchen Cabinet Linear-Foot Takeoff - Cabinets are quoted by the linear foot of run, and the run a shop bills is not the wall length.
Closet Rod and Shelf Takeoff - The closet build nothing counted: rod LF (double-hang walls take two), shelf LF (one per hang run plus the linen stack).
Window / Door Rough Opening Size - The rough opening to frame from a unit size.
Flat Glass Lite Weight - The weight of a glass lite for a safe lift.
LTB Moment-Gradient Factor Cb (AISC 360 Eq. F1-1) - The moment-gradient factor Cb for a lateral-torsional buckling check, instead of the conservative default of 1.0.
Steel Beam Lateral-Torsional Buckling (AISC 360 F2) - The moment an unbraced compression flange allows before it buckles sideways, below the plastic moment.
Steel Block Shear Rupture (AISC 360 J4.3) - The tear-out that pulls a tab of steel from a bolted end, which often governs over bolt shear.
Staggered-Hole Net Width (AISC 360 B4.3b) - The net width of a tension member across a STAGGERED (zigzag) bolt chain.
Steel Tension Member: Yield and Rupture with Shear Lag (AISC 360 D2/D3) - The axial tension capacity of a brace, hanger, or truss diagonal.
RC Tied Column Axial Capacity (ACI 318-19 22.4) - The axial capacity of a concentrically loaded short tied column.
RC Column Longitudinal Steel for a Target Load - The longitudinal steel a target factored axial load needs for a given tied column.
Two-Way Slab Punching Shear at a Column (ACI 318-19 22.6) - The limit state that sets flat-plate thickness and footing depth.
Standard Hook Development Length (ACI 318-19 25.4.3) - Where a straight bar cannot fit - a beam bar anchoring into a column - the detailer hooks it.
Shallow Foundation Elastic (Immediate) Settlement - Immediate elastic settlement of a footing: a serviceability check, not a strength one.
Allowable Bearing Pressure for a Settlement Limit - The largest net contact pressure that keeps immediate settlement within a limit.
Deep Pile Axial Capacity in Clay (Alpha Method) - The analytical pile capacity beside helical-pile's torque correlation.
Pile Embedment Length for a Target Capacity (Alpha Method) - The embedded length that carries a target allowable load.
Infinite Slope Stability Factor of Safety - The screen a site engineer runs before benching a hillside cut.
Infinite Slope Critical Depth for a Target FS - The critical failure-plane depth at which the FS drops to a target.
Infinite Slope Stability with Seepage - Why a slope that stood dry all summer slides in the spring.
Wood Bearing Perpendicular to Grain (NDS 3.10) - The crushing check a framer skips until the beam sinks into the plate.
Wood Tension Member Parallel to Grain (NDS 3.8) - The tie beside the strut: a truss bottom chord or collector checks ft = T/An against Ft x CD x CF.
Wood Beam-Column Interaction (NDS 3.9.2) - A stud carrying wind on a bearing wall is a beam and a column at once.
Steel Web Local Yielding and Crippling (AISC 360 J10) - Where a column bears on a beam or a beam lands on a plate, the web itself can fail before the member does.
Slip-Critical Bolt with Applied Tension (AISC 360 J3.9) - How applied tension cuts the slip resistance of a slip-critical bolted joint.
Slip-Critical Bolt Design Strength (AISC 360 J3.8) - Where slip cannot be tolerated - oversized holes, fatigue, load reversal - the joint is governed by friction, not shear.
Fillet Weld Size Limits and Effective Throat (AISC 360 J2.2b) - What size the code allows before the strength calc even applies.
Wind Components and Cladding Pressure (ASCE 7 Ch. 30) - The local envelope pressure wind-pressure cannot make.
Live Load Reduction (ASCE 7 Ch. 4) - The reduction a big tributary area earns, which sizing to the full tabulated live load misses.
Snow Drift Surcharge at a Roof Step or Parapet (ASCE 7 Ch. 7) - The triangular surcharge that collapses lower roofs, which the flat-roof snow-load never adds.
Rain-on-Snow Surcharge (ASCE 7-22 7.10) - The rain-on-snow surcharge added to a balanced flat-roof snow load.
Snow Guard / Retention Row Layout - The other side of sliding snow: keeping it on the roof instead of catching it below.
Sliding Snow Load on a Lower Roof (ASCE 7 7.9) - The surcharge from snow sliding off a slippery upper roof onto a lower roof.
Minimum Roof Snow Load (ASCE 7 7.3.4) - The floor a low-slope roof's design snow load cannot fall below.
Ramp Cross Slope, Width, and Edge Protection (2010 ADA Standards 405) - The layout can be right and the ramp still wrong.
Lavatory Height and Bathtub Clearance (2010 ADA Standards 606, 607) - Two rules short enough to skip and specific enough to fail a remodel that measured fine everywhere else.
Water Closet Location and Seat Height (2010 ADA Standards 604) - The 18 in everyone remembers is a WINDOW of 16 to 18, and the plumbing code's 15 in minimum is not inside it.
Accessible Parking Space Geometry (2010 ADA Standards 502) - Count is one question and geometry is another, and the van case goes wrong twice.
NFIP Substantial Improvement 50% Rule (44 CFR 59.1) - The rule that decides whether a remodel in a flood zone is a remodel or a rebuild.
Accessible Shower Compartment Types (2010 ADA Standards 608.2) - Three types, three geometries, and picking the wrong one puts a remodel a foot short in the wrong direction.
Drinking Fountain Heights and Count (2010 ADA Standards 211, 602) - One fountain is never enough: 211.2 wants TWO, one for a seated person and one for a standing person.
Tactile Sign Mounting Height and Location (2010 ADA Standards 703.4) - Tactile sign height: 48 in from the lowest character, 60 in from the highest.
ADA Stair Treads and Risers (2010 ADA Standards 504) - A stair that satisfies the building code can fail the ADA, and the usual builder's flight does.
NFIP Flood Opening Area (44 CFR 60.3) - One square inch of NET area per square foot of enclosed area, a minimum of TWO openings.
Knee and Toe Clearance (2010 ADA Standards 306) - What makes a lavatory or work surface usable, and what gets built wrong because an open space looks clear.
Handrail Height, Grip, and Extensions (2010 ADA Standards 505) - 34 to 38 in is the part everybody knows -- and it is a range, so a rail can be too HIGH.
Turning Space and Clear Floor Space (2010 ADA Standards 304, 305) - Two spaces that get conflated and are not the same thing.
Changes in Level and Floor Surfaces (2010 ADA Standards 302, 303) - Three thresholds, and the last is a cliff.
Door Clear Width, Thresholds, and Doors in Series (2010 ADA Standards 404.2) - 32 in is the CLEAR OPENING, not the door.
Accessible Route Width, Pinch Points, and Passing Spaces (2010 ADA Standards 403.5) - 36 in is the route width, and the three rules around it are what get missed.
Protruding Objects and Headroom (2010 ADA Standards 307) - Everybody remembers 4 inches and drops the half that says WHERE.
Reach Ranges for Outlets and Controls (2010 ADA Standards 308) - Four rules, not one number, and which applies turns on the approach and on what is in the way.
Sign Character Height and Viewing Distance (2010 ADA Standards 703.5.5) - Sign letter height, from how high it sits and how close a person can get.
Accessible Parking Space Count (2010 ADA Standards 208.2) - Two rules, and the second is the one that gets skipped.
ADA Ramp Slope, Runs, and Landings (IBC 1012 / ADA) - The full layout of an accessible ramp, not just the slope.
MWFRS Wall Pressure (ASCE 7 Ch. 27) - The lateral pressure the whole building resists, feeding the diaphragm and shear walls.
Gust-Effect Factor G (ASCE 7 §26.11) - The ASCE 7 gust-effect factor G for a rigid building, instead of the flat 0.85 default.
Velocity Pressure Exposure Coefficient Kz (ASCE 7 §26.10) - The ASCE 7 velocity-pressure exposure coefficient Kz at a height and exposure category, instead of a flat 30 ft value.
Wind Force on Solid Freestanding Wall / Sign - Design wind force and Case B eccentric (torsion) moment on a solid freestanding wall, monument sign, or pylon.
Unbalanced Snow Load on Gable Roof (ASCE 7 7.6.1) - The ASCE 7-22 7.6.1 unbalanced gable case.
One-Way Slab / Beam Minimum Thickness for Deflection (ACI 318-19) - The depth that lets a designer skip a deflection calculation entirely.
Max One-Way Slab / Beam Span for a Given Depth (ACI 318-19) - With the slab or beam depth fixed, the longest span that still waives a deflection calculation.
Doubly-Reinforced Concrete Beam Flexural Capacity (ACI 318-19) - When a beam's depth is limited and the tension steel outruns a singly-reinforced section.
One-Way Concrete Shear Without Stirrups (ACI 318-19 22.5.5.1) - The one-way (beam-action) shear a footing, one-way slab, or shallow beam with NO stirrups carries.
Minimum Stirrups and the Section-Size Limit (ACI 318-19 9.6.3) - The stirrup detailing limits a beam can fail even after passing the shear strength check.
Shear Friction Across an Interface (ACI 318-19 22.9) - The shear carried across a cold joint, a corbel interface, or a wall-to-footing plane.
Concrete Modulus of Elasticity Ec (ACI 318-19 19.2.2) - How stiff concrete is at a given strength, the number every deflection and drift check starts from.
Concrete f'c from Modulus of Elasticity (ACI 318-19 19.2.2) - Back out the equivalent in-place f'c from a measured or specified stiffness.
Concrete Modulus of Rupture fr (ACI 318-19 19.2.3) - The tensile stress at which plain concrete first cracks.
Concrete f'c from Modulus of Rupture (ACI 318-19 19.2.3) - Back out the equivalent f'c from a flexural-beam (modulus-of-rupture) test.
Concrete Cracking Moment Mcr (ACI 318-19) - The bending moment at which a plain concrete section first cracks.
Doubly-Reinforced Cracked Moment of Inertia Icr (ACI 318-19) - The cracked moment of inertia for a section with compression steel (a doubly-reinforced section).
Flanged (T-Beam) Cracked Moment of Inertia Icr (ACI 318-19) - The cracked moment of inertia for a flanged (T-beam) section.
Concrete Effective Moment of Inertia Ie (ACI 318-19 Bischoff) - The effective moment of inertia Ie that sets a reinforced concrete member's immediate deflection.
Concrete Section Depth for a Target Cracking Moment - The total section depth that reaches a target cracking moment for a given width.
Shrinkage and Temperature Reinforcement (ACI 318-19 24.4) - Minimum shrinkage/temperature steel perpendicular to the main bars in a one-way slab.
T-Beam Effective Flange Width (ACI 318-19 6.3.2) - The slab width acting with a T-beam web: overhang = smallest of 8 hf, sw/2, ln/8 (interior; both sides) or 6 hf, sw/2.
Minimum Flexural Reinforcement As,min (ACI 318-19 9.6.1.2) - The least flexural steel a concrete beam is allowed to have.
Crack-Control Bar Spacing (ACI 318-19 24.3.2) - Max tension-bar spacing s = min(15(40000/fs) - 2.5 cc, 12(40000/fs)) for flexural crack control.
Concrete Bearing Strength (ACI 318-19 22.8) - The concrete-on-concrete bearing check that forgets the confinement bonus: Bn is not just 0.85 f'c x A1.
Rebar Compression Development Length (ACI 318-19 25.4.9) - How deep compression dowels must embed: ldc = max(fy x psi_r / (50 lambda sqrt(f'c)) x db, 0.0003 fy psi_r db, 8 in).
Concrete Immediate Deflection from Ie (ACI 318-19) - The short-term (immediate) deflection of a reinforced concrete beam or slab under service load.
Long-Term Deflection Multiplier (ACI 318-19 24.2.4) - Why bottom-only beams sag and doubly-reinforced ones hold.
Cast-In Anchor Tension Concrete Breakout (ACI 318-19 Ch. 17) - Concrete breakout capacity of a headed anchor in tension by the ACI 318-19 CCD method.
Concrete Headed-Anchor Pullout (ACI 318-19 17.6.3) - Anchor pullout in tension - the head crushing through the concrete.
Cast-In Anchor Shear Concrete Breakout (ACI 318-19 17.7.2) - Concrete breakout of a cast-in anchor loaded in SHEAR toward an edge.
Concrete Anchor Pryout in Shear (ACI 318-19 17.7.3) - The shear mode that governs SHORT stiff anchors AWAY from an edge - exactly where the edge-breakout check exits.
Concrete Anchor Steel Strength (ACI 318-19 17.6.1 / 17.7.1) - The steel strength of an anchor bolt, the other half of every 'least of steel and concrete' anchor check.
Concrete Anchor Tension-Shear Interaction (ACI 318-19 17.8) - The combined tension-and-shear check on an anchor.
Concrete Anchor Side-Face Blowout (ACI 318-19 17.6.4) - The third headed-anchor tension failure mode, the one deep anchors near an edge actually hit.
Slender Column Moment Magnifier, Nonsway (ACI 318-19 6.6.4) - The nonsway P-delta moment magnifier and magnified design moment for a slender column.
Concrete Corbel / Bracket Design (ACI 318-19 16.5) - The primary tension steel of a concrete corbel or bracket by ACI 318-19 16.5.
Primary Consolidation Settlement (NC Clay) - The slow consolidation settlement that governs a foundation on clay.
Primary Consolidation Settlement (Over-Consolidated Clay) - Settlement of an OVER-consolidated clay, which most natural clays are.
Secondary Compression (Creep) Settlement - The slow settlement that continues AFTER primary consolidation is complete.
Allowable Load for a Settlement Limit (NC Clay) - The largest stress increase that keeps a clay's settlement within an allowable limit.
Eccentric Footing Bearing Pressure and Kern Check - The trapezoidal-or-triangular bearing pressure under a column with axial load plus moment.
Surcharge Lateral Pressure on a Wall from a Line Load (Boussinesq) - Lateral pressure a concentrated surface load puts on a wall, by Boussinesq.
Beam-Column Nonsway Moment Amplifier B1 (AISC 360 App. 8) - The second-order P-delta moment amplifier B1 for a steel beam-column.
Steel Beam-Column Combined Axial and Flexure (AISC 360 H1.1) - The single number that decides a steel beam-column.
Beam-Column Sidesway Moment Amplifier B2 (AISC 360 App. 8) - The sidesway (P-Delta) moment amplifier B2.
Column Effective Length Factor K (Alignment Chart) - The effective length factor K from the joint stiffness ratios G = sum(EI/L)_columns / sum(EI/L)_beams.
Direct-Analysis Stiffness Reduction tau_b (AISC 360 C2.3) - The inelastic stiffness-reduction factor tau_b behind the 0.8 tau_b EI of the AISC direct analysis method.
Column Alignment-Chart Stiffness Ratio G (from member EI/L) - The joint stiffness ratio G from member sizes, the input an effective-length-factor calculation needs.
Bolt Combined Tension and Shear (AISC 360 J3.7) - The tension a bracket, hanger, or moment end-plate bolt has left after its shear.
Relative Density (Density Index) of a Cohesionless Soil - The right compaction measure for a CLEAN SAND.
Relative Compaction from Field Density and Proctor Maximum - The pass/fail an earthwork inspector reads at every test point.
Water to Reach Optimum Moisture for Compaction - Gallons of water to bring a dry lift up to the Proctor's optimum moisture before rolling.
Frost Penetration Depth (Stefan / Modified Berggren) - How deep frost drives into the ground, by the Stefan / modified-Berggren heat-of-fusion method.
Soil Phase Relations (Void Ratio, Porosity, Saturation) - The three-phase makeup behind every settlement and bearing calc, made explicit.
Soil Permeability (Hydraulic Conductivity from a Permeameter Test) - Hydraulic conductivity k from either standard lab permeameter test -- both are Darcy's law solved for k.
Atterberg Plasticity Indices and A-Line Classification - The consistency numbers a geotech report leads with, and an earthwork spec screens fill against.
Soil Activity (Skempton) - The swell/mineralogy index the plasticity index alone hides -- what atterberg-indices names as its own gap.
Aggregate Fineness Modulus (ASTM C136) - The single number that captures how coarse a sand is, for concrete mix proportioning.
Fine Aggregate Grading Check (ASTM C33) - The full sieve-band acceptance the fineness modulus cannot see -- because two very different gradations can share an FM.
Soil Gradation Coefficients Cu / Cc (USCS, ASTM D2487) - The coarse-fraction gradation coefficients of the USCS, and the curve SHAPE a fineness modulus cannot see.
Nail Withdrawal Design Value (NDS 12.2.3) - The design number behind the framer's 'nails don't hold in withdrawal' instinct, which fastener-pullout only tabulates.
Lag Screw Withdrawal Design Value (NDS 12.2.1) - The lag's axial capacity from the NDS equation, not a table.
Wood Screw Withdrawal Design Value (NDS 12.2.2) - Why a screw that holds in fir strips in spruce.
Cantilever Beam Moment, Shear, and Deflection - Max moment (P L + w L^2/2), max shear (P + w L).
Cross-Section Properties (A, I, S, r) - Area, moment of inertia (I = b h^3/12 etc.), section modulus S = I/c.
Combined Axial and Bending Stress (P/A +/- Mc/I) - Extreme-fiber stresses for a short member under axial load plus bending.
Shaft Torsional Shear Stress and Angle of Twist - The shear stress in a shaft under torque, and how far it twists.
Solid Shaft Diameter for an Allowable Torsion - The minimum SOLID-shaft diameter that keeps the max surface shear stress within an allowable.
Restrained Thermal Stress and Force - The stress a temperature change builds in a member that cannot move.
Max Temperature Change for a Stress Limit - The largest temperature change a restrained member can take before its thermal stress reaches the allowable.
Thin-Wall Pressure Vessel Hoop and Longitudinal Stress - The stress a pressure vessel's wall carries, around it and along it.
Thin-Wall Vessel Max Allowable Working Pressure - The maximum allowable working pressure of a thin-wall cylinder from its wall, diameter, and allowable stress.
Design Spectral Response Accelerations SDS / SD1 (ASCE 7-22 11.4) - Site-adjusted design spectral accelerations, SDS and SD1.
Seismic Design Story Drift and Allowable Limit (ASCE 7-22 12.8.6 / 12.12) - Amplified seismic story drift against its allowable limit.
Seismic P-Delta Stability Coefficient (ASCE 7-22 12.8.7) - Whether second-order (P-delta) effects can be ignored, must be amplified, or make the story unstable.
Guard Post Load and Base Connection - The load a guard post and its base connection must carry.
Excavation Protective System and Egress Triggers (OSHA Subpart P) - Whether an excavation requires a protective system at all.
Jobsite Material Stacking Limits (OSHA 1926.250) - Three stacking rules sharing one idea and one trap.
Flammable Liquid Cabinet Storage (OSHA 1926.152(b)) - Everyone knows the per-cabinet rule -- 60 gal of Category 1/2/3 or 120 gal of Category 4 in any one cabinet.
Temporary Stairway Check (OSHA 1926.1052) - The construction stairway, governed differently from a finished one in three ways.
Scaffold Platform and Planking Check (OSHA 1926.451(b)) - The deck the guardrail stands on, and the rule worth knowing is that the maximum overhang follows the BOARD, not the bay.
Scaffold Guardrail System Check (OSHA 1926.451(g)(4)) - The guardrail scaffold-takeoff says is taken off separately, and two things make it more than a tape check.
Egress Window Well (IRC R310.2.3) - The window well an egress window opens into, whose minimums are exactly tangent.
Carbon Monoxide Alarm Requirement and Count (IRC R315) - Where carbon monoxide alarms are required -- and where, unlike smoke alarms, they are not.
Smoke Alarm Count and Placement (IRC R314) - Two halves people confuse. The COUNT is additive and gets undercounted.
Dryer Exhaust Duct Developed Length (IRC M1502.4.5) - The 35 ft everyone quotes is not the number that matters, because fittings eat it.
Door Maneuvering Clearance, Front Approach (ADA 404.2.4.1) - The clearance a plan set gets wrong most often, because it is ASYMMETRIC.
Stairway and Exterior-Door Landing Check - Whether a stair's top and bottom landings meet code.
Egress Window (Emergency Escape Opening) Check - The bedroom-window check with a trap built into the code itself.
Guard and Handrail Code Check - Whether a guard and handrail meet the dimensional code.
Stair Geometry Code Check (IBC 1011 / IRC R311) - Whether a stair's riser, tread, and clear width meet the adopted code, the check every stair permit turns on.
CMU Grout Volume (Partial and Full Grout) - The grout volume for a reinforced CMU wall.
Annular Grout Volume for Cased Bore / Pipe-in-Casing - The grout volume in the ring between a bored casing and the carrier pipe.
Masonry Coursing and Course-Out Check - How many courses reach a height and whether that height lands on a module.
Wallcovering Roll Takeoff With Pattern Repeat - The rolls of wallcovering from the wall perimeter, height, and pattern repeat.
Eave Ice-Barrier Membrane Courses and Rolls - The self-adhering ice-and-water membrane the eave actually needs.
Metal Roof Panels, Linear Feet, and Fasteners - Panels, linear feet, and through-fasteners (or clips) for one metal roof plane.
Hip / Ridge Cap Bundles and Roofing Nails by the Pound - The two accessories the shingle field takeoff leaves open.
Roof Rain Load and Secondary-Drainage Flow (ASCE 7 Ch. 8) - The load that collapses flat roofs: standing water at the blocked-primary case.
ASCE 7 ASD Load Combinations: Governing Demand and Net Uplift - The governing demand and net uplift across the seven ASCE 7 ASD load combinations.
Approximate Fundamental Period Ta (ASCE 7 §12.8.2.1) - The approximate fundamental period Ta of a building, the input a seismic base-shear calculation needs.
Seismic Base Shear (ASCE 7 §12.8 Equivalent Lateral Force) - The earthquake demand on a regular building reduced to one equivalent static base shear.
Vertical Distribution of Seismic Forces (ASCE 7 §12.8.3) - The standard hand calc after the base shear.
Seismic Overturning Stability Ratio at the Foundation - Two of the three overturning stability checks on a seismic force-resisting element.
Seismic Overturning Moment (ASCE 7 §12.8.5) - The overturning the footing and the hold-downs resist, the next number after the vertical distribution.
Building Occupant Load from Area and Use (IBC Table 1004.5) - The one number the whole life-safety chain hangs on.
Egress Exit Count and Required Width (IBC 1005.3 / 1006.2) - Turns the occupant load into the two egress demands.
Minimum Plumbing Fixtures by Occupancy (IBC Table 2902.1) - The minimum water closets, lavatories, drinking fountains.
Formwork Shore Post Load and Spacing (ACI 347) - The vertical load path of an elevated pour.
Scaffold Mudsill Bearing Pressure and Sill Length - The soil pressure a scaffold leg presses through its mudsill (leg load / plank area).
Scaffold Per-Leg Load and OSHA 4:1 Check - The load on each scaffold leg and whether it clears the OSHA 4:1 safe working load.
Frame Scaffold Material Takeoff - Frames, cross braces, planks, and base plates for a frame-scaffold run off the bay layout and lifts.
Concrete Surface Evaporation Rate and Plastic-Shrinkage Risk (ACI 305) - The finisher's go / no-go on plastic-shrinkage precautions, read off the day's weather.
Fresh Concrete Temperature (ACI 305.1) - The temperature of fresh concrete as batched, from the ACI 305.1 ingredient heat balance.
Concrete Age-Strength Gain for Form Stripping (ACI 209) - How much of its specified 28-day strength a slab has reached at a given age.
Concrete Maturity and Equivalent Age (ASTM C1074) - The temperature-honest cure schedule: the Nurse-Saul time-temperature factor (Ta - T0) x hours in deg C-hr.
Rebar Weight Takeoff - ASTM A615 nominal bar weight per foot x total linear feet, to tons and cost.
Ready-Mix Concrete Order (Trucks, Waste, Short Load) - How much ready-mix to order, how many trucks that is, and whether a short-load fee applies.
Concrete Yield and Relative Yield (ASTM C138) - Whether a load delivered the yards ordered, from the batch weights and the measured fresh unit weight.
Water-Cementitious Ratio and Exposure Cap (ACI 318) - The single strongest lever on concrete strength and durability.
Insulation Batt Coverage and Count - Batts and bags from the net cavity area / coverage per batt and per bag, at a waste allowance.
Trim Linear Footage and Miters - The trim to order for a room, and how many stock lengths that comes to.
Allowable Building Area per Story (IBC Chapter 5) - The first feasibility number on a commercial project.
Egress Travel Distance, Common Path, and Dead-End Check (IBC Chapter 10) - The three distances a plans examiner checks against the floor plan.
Exterior Wall Opening Limit by Fire Separation Distance (IBC Table 705.8) - How much of an exterior wall may be windows and doors.
Wood Bending Member (NDS Beam Stability Factor CL and Adjusted Fb') - Whether a wood beam bends without buckling its unbraced compression edge sideways.
Glulam Volume Factor Cv (NDS 5.3.6) - The volume factor that reduces a glued-laminated beam's bending strength.
Wood Bending Member Shear (fv and the NDS Tension-Side End-Notch Reduction) - The end shear a wood beam carries, and how much a tension-side notch at the support takes away.
Wood Beam Compression-Side End Notch Shear (NDS 3.4.3.2) - The shear capacity of a beam notched on the COMPRESSION face at the end.
Single-Shear Bolted / Dowel Lateral Design Value (NDS Yield-Limit Z) - How much lateral load one bolt through two wood members carries, from the NDS European yield model.
Steel Beam Flexural Capacity (AISC 360 Ch. F, Compact + Braced) - Whether a compact, laterally-braced steel W-shape carries the moment.
Required Plastic Section Modulus for a Steel Beam - The design inverse of the flexural-capacity check.
Shear Flow and Connector Spacing (Built-Up Beam) - The horizontal shear flow at a connected interface of a built-up beam and the fastener/weld spacing that carries it.
Steel Beam Web Shear Capacity (AISC 360 Ch. G) - The web shear a steel beam carries at its ends, where the reaction is highest and the moment is zero.
Steel Column Compressive Capacity (AISC 360 Ch. E, Flexural Buckling) - The axial load a steel column carries, set by its slenderness not its area.
Eccentric Bolt Group in Shear (Elastic Vector Method) - The force on the worst bolt in a bracket or shear-tab group loaded off its centroid.
Bolt Shear + Bearing / Tearout Strength (AISC 360 J3) - The design strength of one bolt through a plate.
Column Base Plate under Axial Load (AISC Design Guide 1) - The plan size and thickness of a concentrically-loaded column base plate.
Composite Shear Stud Strength and Count (AISC 360-22 I8) - The strength of one composite shear stud, and how many a beam needs on each side.
Composite Beam Flexural Strength (AISC 360-22 I3) - The moment a composite steel-and-slab beam can take.
Steel Beam Camber from Dead-Load Deflection - Camber = a fraction (75-80%) of the dead-load deflection 5 w L^4 / (384 E I), rounded to 1/4 in. 1.0 kip/ft, 40 ft.
Required Moment of Inertia for a Deflection Limit - The moment of inertia a simple-span beam needs to hold the uniform-load midspan deflection to a limit.
Steel Floor Walking Vibration (AISC DG11) - AISC Design Guide 11 walking-vibration check.
Column Web Panel-Zone Shear (AISC 360 J10.6) - The AISC 360-16 J10.6 panel-zone shear strength of a moment-connection column web, both branches.
Panel-Zone Shear Under High Column Axial (AISC 360 J10-10/J10-12) - How column axial load cuts panel-zone strength.
Panel-Zone Doubler-Plate Thickness (AISC 360 J10.6) - How thick a panel-zone doubler plate must be, sized by two limits.
T-Beam Flexural Capacity (ACI 318-19) - The flexural capacity of a reinforced concrete T-beam, where the flange acts with the web.
Reinforced Concrete Beam Flexural Capacity (ACI 318-19) - The design moment of a singly-reinforced, tension-controlled rectangular concrete beam.
Reinforced Concrete Beam Shear and Stirrup Spacing (ACI 318-19) - Whether a rectangular concrete beam carries its shear and what stirrup spacing it needs.
Concrete Threshold and Cracking Torsion (ACI 318-19 22.7) - The two torsion thresholds every spandrel and edge beam is checked against.
Rebar Tension Development Length (ACI 318-19) - The straight-bar tension development length from the ACI 318-19 general equation.
Shallow Foundation Bearing Capacity (Vesic) - The gross ultimate and allowable bearing pressure of a shallow footing from the soil's own strength.
Lateral Earth Pressure and Thrust (Rankine) - How hard retained soil pushes on a wall, active and passive.
At-Rest Earth Pressure on a Braced Wall (Jaky K0) - The push of retained soil on a wall that cannot yield -- a basement wall, a braced excavation, a rigid box culvert.
Submerged-Backfill Earth Pressure (Buoyant + Hydrostatic) - The push of a backfill below the water table.
Sloped-Backfill Earth Pressure (Rankine Inclined Surface) - The push of a backfill that rises behind the wall at a slope beta, which the level Ka under-predicts.
Coulomb Active Earth Pressure (Wall Friction and Batter) - The active thrust Rankine leaves on the table.
Mononobe-Okabe Seismic Active Earth Pressure - The extra earth pressure an earthquake puts on a retaining wall.
Embedded Post / Pole Depth for Lateral Load (IBC 1807.3) - How deep a post actually goes - the question every fence, sign, deck-rail, and flagpole install starts with.
Rankine Active Earth Pressure on a Cohesive (Clay) Backfill - How cohesion cuts active earth pressure: it subtracts a constant 2 c sqrt(Ka) at every depth.
Cantilever Retaining Wall Stability (Overturning / Sliding / Bearing) - The three global-stability checks of a cast-in-place cantilever retaining wall.
Consolidation Time Rate (Terzaghi) - How long a clay layer takes to reach a given degree of consolidation.
Consolidation Degree from Elapsed Time (Terzaghi) - How far a surcharge or fill has consolidated after a given time.
Coefficient of Consolidation cv from Oedometer Curve - The coefficient of consolidation cv from an oedometer (ASTM D2435) time-settlement curve.
SPT Allowable Bearing on Sand (Meyerhof) - Meyerhof settlement-controlled allowable from the SPT N60.
Required SPT N60 for a Target Bearing (Meyerhof) - The energy-corrected N60 the sand must show to carry a target allowable pressure at a 1 in settlement.
Soil Vertical Total and Effective Stress (Terzaghi) - The vertical effective stress at a depth, from the soil profile and the water table.
Liquefaction Triggering Screening (Seed-Idriss CSR) - Seed-Idriss screen: rd = 1 - 0.00233172 z (z <= 30.02 ft; per-meter 0.00765/0.0267 scaled by 0.3048).
Pile Group Efficiency (Converse-Labarre) - Why a pile group carries less than the sum of its piles.
Pile Group Spacing for a Target Efficiency - The center-to-center spacing that reaches a target Converse-Labarre efficiency.
Reinforced CMU Wall Out-of-Plane Flexure (TMS 402 ASD) - The allowable out-of-plane bending moment of a reinforced.
Masonry Headed Anchor Bolt Tension (TMS 402 ASD) - The allowable tension of a headed anchor bolt in grouted masonry.
Reinforced CMU Shear Wall In-Plane Shear (TMS 402 ASD) - The allowable in-plane shear of a reinforced, fully grouted masonry shear wall.
Reinforced CMU Wall Axial Compression (TMS 402 ASD) - The allowable concentric axial load of a reinforced masonry wall or column.
Masonry Anchor Embedment for a Tension (TMS 402 ASD) - The effective embedment that makes the TMS 402 masonry-breakout capacity equal a required tension.
Masonry Anchor Bolt in Shear (TMS 402 ASD) - The allowable SHEAR of an anchor bolt in grouted masonry.
Masonry Compressive Strength f'm, Unit-Strength Method (TMS 602 Table 2) - The net-area masonry compressive strength f'm.
Masonry Wall Dead Load - Wall dead load = hollow (NCMA) weight + grout adder prorated by grout spacing (capped at full).
Brick Veneer Anchor Spacing and Count (TMS 402 / IBC 1405) - Anchor count = ceil(area / area-per-anchor) with the 32 in horizontal / 24 in vertical spacing caps.
Brick Veneer Weep-Hole Count (IRC R703.8.6) - Weep holes to drain the veneer air space at each through-wall flashing line.
Masonry Horizontal Joint-Reinforcement Takeoff (IRC R606.12.2) - Ladder or truss wire laid in the bed joints of a masonry wall.
Masonry Limited Access Zone and Bracing (OSHA 1926.706) - The zone people mark with a few feet of tape is a COMPUTED dimension.
Masonry Fireplace Flue Area (IRC R1003.15.1) - Whether the flue is big enough for the opening it serves, by the code's Option 1 ratio test.
Masonry Lintel Bearing Length (TMS 402) - The bearing length a masonry lintel needs where it lands on its support.
Masonry Lintel Arching Load (Triangular Load Over an Opening) - The triangular dead load a lintel carries within a 45-degree triangle (height span/2) when the wall above >= span/2.
Wood Diaphragm Unit Shear and Chord Force (SDPWS) - The flexible wood diaphragm as a deep horizontal beam.
Wood Shear Wall Unit Shear and Holdown (SDPWS / ASD) - The two numbers a wood shear wall is detailed for.
Wood Shear Wall Deflection (SDPWS Eq 4.3-1) - How far the top of a wood shear wall drifts, from the SDPWS three-term equation.
Collector / Drag Strut Axial Force (ASCE 7 12.10) - Axial force in a collector that drags diaphragm shear back to the shear wall.
Elevator Round-Trip Time, Interval, and Handling Capacity - How many elevator cars a building needs, by the classical round-trip-time traffic analysis that every developer.
Glass Lite Wind Load, Deflection Limit, and Weight - The three numbers a glazier needs before ordering a large lite, and only one of them needs a standard.
Attached Canopy and Awning Wind Uplift and Snow Load - Wind uplift and snow on an attached canopy or awning.
Garage Door Torsion Spring Torque, Turns, and Rate - What a garage door torsion spring has to do.
Window Film Solar Heat Gain Reduction and Payback - What window film actually buys, priced honestly.
Insulating Glass U-Factor and Interior Condensation Screen - The U-factor of a glazing unit and the interior glass temperature that turns it into a service call.
Escalator Handling Capacity and Step Loading - What an escalator actually moves, which is roughly half of what the theoretical number says.
Airless Spray Tip Size, Fan Width, Output, and Coverage Rate - What an airless tip number actually means and what it commits the sprayer to.
Wall and Ceiling Texture Material Takeoff - The material for the last coat ordered on a drywall job and the one most often short.
Railroad Curve Superelevation, Unbalance, and Maximum Speed - Every curve on a railroad is banked, and the bank is a compromise between the fastest train and the slowest.
Railroad Degree of Curve, Radius, and Middle Ordinate - Railroads describe a curve by degree, highways by radius, and the conversion trips up everyone who works across both.
Continuous Welded Rail Thermal Force and Neutral Temperature - Continuous welded rail has nowhere to go when it heats up, so it builds enormous internal force instead.
Rail Head Wear, Combined Limit, and Tonnage to Replacement - Rail wears down on the head and sideways on the gauge face, and it is condemned on whichever gets there first.
Track Cross-Level Deviation and Warp Against a Class Limit - Warp is a twist in the track over a short distance, and it is the geometry defect that derails the most trains.
Track Ballast Section Volume, Tonnage, and Surfacing Raise - Ordering ballast is a cross-section times a length, and the cross-section is a trapezoid people flatten into a box.
Turnout Frog Angle, Separation, and Clearance Point - A turnout is described by its frog number, and that one number sets the angle, the speed, and the track it eats.
Elevator Traction Roping Ratio, Torque, and Rope Tension - A 2:1 roped elevator moves its car half as fast as its ropes, and every number in the machine room follows.
Elevator Counterweight Balance and Unbalanced Load - A traction elevator's counterweight balances the car plus a fraction of its load, and that fraction is a choice.
Elevator Suspension Rope Factor of Safety - Elevator suspension ropes carry people, and the term most often dropped from their load is the ropes themselves.
Elevator Buffer Stroke and Impact Speed - A buffer has to stop a falling car without hurting anyone in it, and stroke grows with the square of speed.
Hoistway Smoke Venting and Pressurization Screen - A hoistway is a chimney running the height of a building, and the code has changed its mind about what to do.
Elevator Machine Room Heat Load and Cooling - An elevator machine room gets hot because the drive dumps its losses into it, and a hot room stops the elevator.
Hydraulic Elevator Jack Pressure, Flow, and Bore Change - A hydraulic elevator's working pressure is the load over the jack area, and the flow is the area times the speed.
Escalator Step Chain Tension, Drive Power, and Brake Load - An escalator step chain drags the whole loaded step band up the incline, and mostly it is fighting gravity.
Elevator Door Closing Kinetic Energy and Force - An elevator door is limited by force and by energy, and the energy limit is the one that catches heavy doors.
Elevator Overspeed Governor Tripping Speed Band - An overspeed governor decides a car is running away, and it does it at two different speeds, in order.
Elevator Guide Rail Bracket Span, Stress, and Deflection - Guide rails span between brackets like any beam, and a rail failing on stiffness wants a bracket, not more steel.
Door Closer Size, Opening Force, and Where the Overage Is - A closer has to be strong enough to latch the door and weak enough that a person can open it, and those fight.
Lock Backset, Bore, Stile, and Strike Layout - Boring a door for a lock is unforgiving: a hole in the wrong place is a new door, not a correction.
Panic Hardware Operating Force and What a Failure Points At - Panic hardware exists so a crowd pushing toward an exit gets out, and the code caps how hard the bar may be.
Master Key System Depth and Change Key Capacity - A master key system runs out of usable keys long before anyone expects, and the shortfall is designed in on day one.
Key Bitting MACS and Adjacent Cut Check - A bitting that looks fine on paper can be uncuttable.
Door Undercut Free Area, Transfer Airflow, and Noise - A door undercut is the transfer air path for a room with no return, and the limit on it is noise, not physics.
Fire Door Clearance Check (NFPA 80 Annual Inspection) - A fire door assembly is inspected annually and it fails on clearances measured in fractions of an inch.
Slide Gate Operator Force, Grade, and Duty Cycle - A slide gate operator is sized on force and killed by duty, and duty is the number nobody checks until the third motor.
Revolving Door and Turnstile Peak Throughput - A revolving door is chosen for the envelope and then becomes the bottleneck at shift change.
Blasting Powder Factor and Explosive Load per Hole - Powder factor is the one blasting number comparable across shots, benches, and years the way a pattern is not.
Blast Pattern Burden, Spacing, and Stiffness Ratio - Every dimension in a blast pattern is a multiple of the hole diameter or the burden, so one ratio sets the whole design.
Blast Vibration Scaled Distance and Peak Particle Velocity - Vibration scales with charge weight per DELAY, not per shot, and that one fact is why quarries can work near towns.
Blast Airblast Overpressure and Confinement Screen - Airblast scales with the CUBE root of charge weight where ground vibration scales with the square root.
Blast Hole Stemming Length and Flyrock Screen - Stemming is the plug that keeps explosive gases in the hole.
Crusher Reduction Ratio and Circuit Stage Check - Reduction ratios MULTIPLY through a crushing circuit, which is why one machine cannot do what three can.
Vibrating Screen Deck Capacity and Feed Check - A screen passing oversize with nothing mechanically wrong is usually out of area, and this is the number that says so.
Belt Feeder Volumetric Capacity and Density Check - A belt feeder is a metering device and its capacity relation is not a conveyor's.
Dust Collector Air-to-Cloth Ratio and Bag Derate - Air-to-cloth ratio is a velocity, and pushing air through fabric too fast blinds a collector permanently.
Dust Deflagration Vent Area Screen (NFPA 68) - Venting works by opening a hole large enough and fast enough that the pressure inside never exceeds what...
Underground Face Airflow, Velocity, and Diesel Dilution - Four requirements compete at a heading face and the largest wins.
Pit Dewatering Total Head, Staging, and Suction Limit - In a deep pit the static lift dominates the head, and the suction side is what stops bad plans.
Highwall Bench Width and Overall Slope Angle - Stack benches and the wall gets flatter overall even though every face is steep.
Rock Bolt Pattern Support Pressure and Dead-Weight Check - Each bolt holds the ground in its own tributary area, so the pressure it supplies is its capacity over that area.
Heading Blast Fume Clearance Time and Air Changes - Dilution decays exponentially, so each air change removes the same FRACTION rather than the same amount.
Mine Hoist Rope Factor of Safety and Depth Limit - On a deep shaft the hoist rope's own weight can exceed the payload, and leaving it out is wrong in the unsafe direction.
Directional Bore Minimum Bend Radius and Entry Setback - The pipe, not the rig, usually sets a bore's bend radius -- and by a factor of eight or more.
HDD Drilling Fluid Volume, Bentonite, and Spoil - The hole volume is the small number; the fluid requirement is a multiple of it.
HDD Annular Pressure and Frac-Out Screen - A frac-out starts at the SHALLOW end of a bore, not at the deepest point under the crossing where people worry.
Utility Locate Depth Cross-Check and Distortion Screen - A locator's depth readout assumes a single isolated conductor, and when it is wrong it reads SHALLOW.
Vacuum Excavation Spoil, Swell, and Tank Fills - The individual pothole is small and the day's total is not.
Pipe Bursting Displacement, Pull Load, and Heave Screen - The soil has to go somewhere, and the upsize ratio rather than the absolute size is what decides where.
CIPP Liner Thickness for Groundwater Buckling (ASTM F1216) - A CIPP design run on the short-term modulus is unconservative by a quarter, and ovality costs more than people expect.
Groundwater Seepage Velocity and Travel Time - Darcy's law gives a FLUX and not a speed.
Well Point Dewatering Spacing and Staging - A well point system lowers the water table around an excavation so the cut is made in the dry.
Stormwater Water Quality Volume and Drawdown - The water quality volume is a DIFFERENT SIZING QUESTION from detention.
Drone Flight GSD, Overlap, and Image Count - Ground sample distance is the ground a single pixel covers, and it follows from similar triangles.
LiDAR Point Density and Flight Line Spacing - Point density is the pulse rate divided by the ground area the sensor sweeps per second.
RTK Baseline Error Budget and Vertical Uncertainty - An RTK specification is written as a fixed component plus a parts-per-million term.
Mass Haul Balance, Free Haul, and Overhaul - A mass haul diagram is the cumulative algebraic sum of cut and fill along an alignment.
Square-to-Round Transition Development - Triangulation is the method and TRUE LENGTH is the only idea in it.
Standing Seam Metal Panel and Clip Takeoff - COVERAGE WIDTH IS THE NUMBER THAT MATTERS AND IT IS NOT THE PANEL WIDTH.
Metal Roof Thermal Movement and Sliding Clip Range - Metal expands, and on a standing seam roof the panel is long enough that it matters.
Mortar Batch Proportions by Volume (ASTM C270) - ASTM C270 gives mortar as VOLUME PROPORTIONS of cementitious material and sand, and the batch scales from the cement.
CMU Grout Lift and Pour Height Limits - Two limits control two different failures and they are constantly confused.
Masonry Cleaning Dilution, Coverage, and Rinse - THE CONCENTRATION IS A PROPERTY OF THE MASONRY RATHER THAN OF THE SOILING, and that inversion is the whole discipline.
Scaffold Tie Spacing and Height-to-Base Ratio - THE 4-TO-1 RATIO IS A THRESHOLD RATHER THAN A DESIGN.
Mast Climbing Work Platform Zone Load - A MAST CLIMBER IS A CANTILEVER, and the manufacturer's capacity is stated for a defined load distribution.
Suspended Scaffold Outrigger Counterweight - THE LEVER RATIO IS WHAT MAKES THE COUNTERWEIGHT LARGE, and it is why crews consistently underestimate it.
Slab Shoring and Reshoring Load Distribution - A slab poured on shores does not load the slab directly below it.
Concrete Pump Line Pressure and Reach Limit - A concrete pump line has a pressure limit and a concrete mix has a pumpability.
Concrete Boom Pump Reach and Setup Radius - A boom pump's advertised reach is a vertical number and a horizontal number that cannot both be achieved at once.
Post-Tension Tendon Elongation and Jacking Force - Elongation is a measurement of a tendon's whole length responding to the force actually in it.
Tilt-Up Panel Lifting Stress and Insert Layout - A tilt-up panel is a slab spanning between its insert rows during the pick.
Tilt-Up Panel Temporary Brace Load and Count - The temporary condition is genuinely the design case for a tilt-up building.
Skip Line Cycle Layout and Stripe Count - Skip line is laid out on a cycle -- one stripe plus one gap.
Speed Hump and Speed Table Geometry - A speed hump's height and length set the speed a driver finds comfortable.
Intersection Sight Triangle and Departure Distance - A driver waiting to pull out needs to see far enough along the through road to complete the manoeuvre before...
Flexible Pavement Structural Number (AASHTO 93) - Flexible pavement design comes down to one number that describes the whole section.
Subgrade CBR to Aggregate Cover Thickness - Aggregate thickness over a soft subgrade is set by how weak the subgrade is, and CBR is the field measure that says so.
Equivalent Single Axle Loads (ESAL) Traffic Loading - Pavement damage goes as roughly the FOURTH POWER of axle load.

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