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Cold-Applied Liquid Waterproofing Membrane Volume Calculator

Calculate the liquid waterproofing material needed to achieve a target dry film thickness, accounting for solids content.

Computed in your browser — nothing you enter is uploaded. Figures are presented for United States against IRC 2024, and every formula is cited under regulatory standards below.

Last verified 2026-08-26 · v1.0.0

Market
Imperial · sales tax

Liquid membrane volume needed

25.16 gal

Check your inputs

Solids content and dry film thickness requirements vary by manufacturer and application (horizontal vs. vertical, exposure condition) — confirm your specific product's technical data sheet for exact coverage rates.

Required wet film thickness
75 mils

At the values currently entered, the liquid membrane volume needed works out to 95.3. Confidence is moderate: the method is sound, but real materials and site conditions vary. Figures are shown for United States, where IRC 2024 is the governing residential reference; switch the market above if you are building elsewhere.

Estimated cost — your price

This site holds no price list for this material — local prices vary too much to publish honestly. Enter your supplier's price and the result is costed with it.

Preliminary estimate, not certified engineering. This tool produces an indicative quantity calculation for planning purposes only — it is not a certified structural analysis, a guaranteed material takeoff, or a substitute for building department approval. Always verify measurements on-site and have a licensed contractor or structural engineer review any load-bearing, code-sensitive, or safety-critical work before purchasing materials or starting construction. Spotted an arithmetic or standards error? Report it to contact@craftquantities.com with your inputs — confirmed fixes become pinned regression tests.

[Schema Verified] Computed in alignment with American Concrete Institute (ACI 318-19) formulas and International Residential Code (IRC 2024) spatial boundaries.

Regulatory standards & verification citations

  • Wet film thickness = target dry film thickness ÷ solids content fraction, since liquid-applied membranes lose volume as solvent/water evaporates during cure; material volume = area × wet film thickness

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Most jobs need more than one number. Add the calculators you need next and they open right here, underneath this one — your figures stay on screen and nothing is lost to a page change.

Frequently asked questions

Why is the required wet film thickness greater than the dry film thickness?
Liquid-applied membranes lose volume as solvent or water evaporates during cure. Since the product isn't 100% solids, you must apply more material wet than the cured thickness that remains — wet film thickness = target dry film thickness ÷ solids content fraction.
Where do I find my product's solids content?
It's listed on the manufacturer's technical data sheet, usually as a percentage by volume. Use that exact figure rather than an assumed value, since it directly changes how much material you need to order.
Does required dry film thickness change between horizontal and vertical applications?
Yes — manufacturers often specify different minimum dry film thicknesses depending on whether the membrane is applied horizontally or vertically, and on the exposure/hydrostatic condition. Always confirm the correct target DFT for your specific application from the product's data sheet.