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): board-feet = area x thickness; sets = ceil(bd-ft x (1 + waste) / set yield). 2,000 sf at 3 in of closed-cell is 6,000 board-feet, which on a 4,800 bd-ft set (with waste) is 2 sets; open-cell at a thicker 5.5 in still fits in 1 set because it yields far more. Temperature and substrate cut the field yield; the product set yield governs.
Formula and source
board_feet = area_sf x thickness_in; sets = ceil(board_feet x (1 + waste_pct/100) / yield_bd_ft_per_set).
Spray-foam board-feet identity by name (area x thickness gives board-feet; sets from board-feet over the per-set yield); first-principles arithmetic.
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