Siding Course Layout (Story Pole)

The layout half siding-takeoff defers: divide the wall into WHOLE courses and shrink the exposure evenly so the top course lands full instead of a sliver. A 9-ft wall at a 7-in target takes 16 courses at 6.75 in - and would otherwise end in a 3-in strip at the frieze. Checks the exposure ceiling (board height minus the manufacturer's minimum headlap) and notes that shrinking exposure only ever increases the lap. Starter and per-course LF included; squares and material are siding-takeoff.

courses = ceil(height/target exposure); adjusted exposure = height/courses (the story-pole mark); exposure ceiling = board height - manufacturer minimum overlap; starter = wall length; course LF = courses x length.

Siding story-pole layout arithmetic - no standard claimed; the exposure ceiling is the manufacturer's stated minimum headlap, entered by the user (1-in default).

Layout arithmetic; every siding manufacturer's installation instructions publish the exposure and overlap limits free.

Estimate. AHJ and licensed professional govern.

Field names used by the API: wall_height_ft, wall_length_ft, target_exposure_in, board_height_in, min_overlap_in, courses, adjusted_exposure_in, max_exposure_in, sliver_in, starter_lf, total_course_lf

• Whole-course adjustment courses x adjusted exposure equals the wall height exactly; the top course is always fullstory-pole practice
• Overlap safety shrinking exposure increases headlap, so an adjusted layout never violates a minimum the target clearedgeometry of lap siding