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. 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-estimate and metal-roof-panels.
Formula and source
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.
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