Waterproofing Membrane Calculator

Calculate waterproofing membrane for basement walls, decks, and wet areas. Get rolls, adhesive, and seam tape quantities.

πŸ’§ Waterproofing Membrane Calculator

Results

Surface Area240.00 sq ft
With 15% Overlap276.00 sq ft
Rolls/Units Needed2
Seam Tape45 lin ft

πŸ’‘ How to Calculate Waterproofing Membrane

Waterproofing membranes come in three main types: sheet membranes (rubberized asphalt, 200 sq ft/roll), liquid-applied (100 sq ft/gallon), and peel-and-stick (self-adhered, 75 sq ft/roll). Calculate the surface area to cover, add 15% for overlaps and waste.

All seams must be overlapped 4–6 inches and sealed with compatible tape or adhesive. For below-grade applications, the membrane must extend from the footing to at least 6 inches above grade. Detail all penetrations, corners, and transitions carefully.

A 30Γ—8 ft basement wall: area = 240 sq ft + 15% = 276 sq ft. Sheet membrane: 2 rolls. Liquid applied: 3 gallons. Peel & stick: 4 rolls. Seam tape: 45 lin ft.

Waterproofing Membrane Calculator FAQ

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