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.
Example
You enter
- Gross wall area (ft²) 2000
- Openings to deduct (ft²) 200
- Waste allowance (%) 12
- Lap exposure / reveal (in) 4
You get
- Net area (ft²) 1800
- Squares 20.16
- Lap board footage 5400 LF
Details, formula, and sources
net = wall - openings; squares = net x (1 + waste/100) / 100; linear = net / (exposure/12). 2,000 sf of wall less 200 sf of openings at 12% waste is 20.16 squares, and at a 4 in exposure about 5,400 LF of lap board; a wider 6 in reveal cuts it to 3,600 LF at the same squares. A square is 100 sf. Starter strip, corners, J-channel, and trim are taken off separately. Distinct from fence and metal-roof-panel takeoffs.
net_area_sf = wall_area_sf - opening_area_sf; squares = net_area_sf x (1 + waste_pct/100) / 100; linear_ft = net_area_sf / (exposure_in/12).
Siding-takeoff identity by name (net after openings; squares from net and waste; linear from net over exposure); first-principles quantity arithmetic.
The siding takeoff is public quantity-survey arithmetic; the exposure and trim schedule come from the product and the drawings.
Estimate. AHJ and licensed professional govern.
Field names used by the API: wall_area_sf, opening_area_sf, waste_pct, exposure_in, net_area_sf, squares, linear_ft
- Square 100 sf of wall (the siding coverage unit)quantity-survey convention
- Exposure the lap reveal to the weather in inches (~4 in default); the product sets itsiding manufacturer