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Liquid Waterproofing Membrane Calculator

Estimate liquid waterproofing membrane and fabric from area, coverage rate, coat count, and mixing allowance.

Inputs

Area, coats and allowance

Range: 1–10,000 ft2

Range: 10–200

Per coat, from the product data sheet. Two coats are typical.

Range: 1–4

Range: 0–30

Covers roller/paint loss, roller texture and the extra membrane used over fabric at corners and around the drain.

Seams and corners

Range: 0–2,000 ft

Range: 1–1,000 ft

Length printed on the fabric roll or package.

Result

Coated area
160
Fabric length
30
Fabric rolls
1.00 rolls
Membrane to buy
4.00 gal
Exact membrane need before whole-gallon purchase
3.52 gal
Two or more coats: reinforce inside corners, wall/floor changes, seams and the drain flange with the membrane fabric

How this was calculated

Membrane to buy
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Planning estimate only. Verify the entered measurements, product data sheet, site conditions, and applicable local requirements before ordering or installing. This calculator does not establish product suitability or code compliance.