Foundation Waterproofing Calculator
Material and cost from foundation wall area.
Inputs
Results
Net wall area (sq ft)
1,200
Total application area (sq ft)1,500
Material quantity (gal or rolls)42
Form ties to seal300
Drainage board sheets6
Material cost ($)$2,760
Total estimated cost ($)$5,010
Cost per sq ft ($)$4.18
Material Description42 gallons spray membrane
How to Use This Calculator
- Enter Foundation Perimeter (ft) and Below-Grade Wall Height (ft) to define the total wall area.
- Select System Type (1=dampproofing, 2=spray-applied rubber, 3=sheet membrane) based on performance requirements and budget.
- Input Form Tie Spacing (inches) — each tie penetration requires sealing before membrane application.
- Set Include Footing Detail to 1 for a complete waterproofing system with membrane wrap at the wall-to-footing joint.
- Enter Window/Opening Deductions (sq ft) to net out areas not receiving membrane.
- Review Material Quantity, Form Ties to Seal, Drainage Board Sheets, and Total Estimated Cost for procurement and contractor pricing.
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