Material Quantity
Quantity for common assemblies with waste factor.
Example
You enter
- Assembly drywall_4x8
- Area (ft²) 1000
You get
- Raw units 31.25
- Units (with waste) 35
- Coverage / waste 32
- Waste factor 0.1
Details, formula, and sources
Sheet / linear / plank quantities = area or run / unit + waste factor + per-edge cut allowance.
Engineering-practice waste-factor consensus.
Free in published trade references.
Estimate. AHJ and licensed professional govern.
Field names used by the API: assembly, area_ft2, units_raw, units_with_waste, coverage_ft2_per_unit, waste_factor
- Default waste factor 10% unless user suppliesengineering practice