Foundation Waterproofing / Dampproofing Takeoff
The fluid-applied waterproofing or dampproofing to coat a below-grade foundation wall: area = perimeter x average below-grade height; gallons = ceil(area x (1 + waste) / the product's coverage rate). A 150 ft perimeter, 8 ft below grade is 1,200 sf, so at 50 sf/gal spray-applied with 10% waste it takes 27 gallons (6 five-gallon pails). The coverage rate is the lever and varies widely: thin sprayed-asphalt DAMPPROOFing runs ~40-60 sf/gal (a moisture barrier, IRC R406.1), while a fluid-applied WATERPROOFing membrane built to a wet-mil thickness (for hydrostatic head, IRC R406.2) covers far fewer sf/gal per coat and often needs two coats plus reinforcing fabric -- read it off the data sheet, not a default. Sheet peel-and-stick membrane is ordered by the roll instead. A material-ordering estimate; the product data sheet, the assembly detail (drainage board, footing drain), and IRC R406 and the AHJ govern.
Formula and source
wall_area_sf = perimeter_ft x below_grade_height_ft; gallons = ceil(wall_area_sf x (1 + waste_pct/100) / coverage_sf_per_gal); pails_5gal = ceil(gallons / 5).
Foundation waterproofing / dampproofing material takeoff (area x coverage), by name; IRC R406 (dampproofing vs waterproofing) and the product data sheet and AHJ govern.
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