Cementitious Waterproofing Calculator

Crystalline waterproofing coverage and application rate.

Surface area (sq ft)

Product (1=crystalline, 2=coating, 3=polymer)

Number of coats

Substrate (1=smooth, 2=broom, 3=block, 4=rough)

Side (1=positive, 2=negative)

Water pressure (PSI)

Tab to move between fields

Material needed (lbs/bags/kits)

Mix water (gallons)0.8

Material cost ($)$77.00

Total DFT (mils)0

Max pressure rating (PSI)150

Pressure adequateYes

Estimated labor (hours)10

Unit Labellbs

Prep Water (gal)7.5

Cure Time Hours48

How to Use This Calculator

Enter Surface Area (sq ft) — the total concrete or masonry area to be waterproofed.
Select Product (1=crystalline, 2=cementitious coating, 3=polymer-modified) based on your project specification.
Set Number of Coats and Substrate Condition (1=smooth to 4=rough) — rougher surfaces absorb more material.
Choose Application Side (1=positive/exterior, 2=negative/interior) and enter Water Pressure (PSI).
Review Material Needed (lbs/bags) and Max Pressure Rating (PSI) to confirm the system handles your hydrostatic load.
Use Estimated Material Cost and Labor Hours for subcontractor pricing and project scheduling.

How the result changes with Surface area (sq ft)

Surface area (sq ft)	Material needed (lbs/bags/kits)
10,001	423
35,001	1,477
65,000	2,742
90,000	3,795

Surface area (sq ft): Total concrete or masonry surface area to waterproof.
Product (1=crystalline, 2=coating, 3=polymer): 1 = Crystalline (Xypex/Penetron). 2 = Cementitious coating (Thoroseal). 3 = Polymer-modified (Mapelastic).
Number of coats: Most cementitious systems require 2 coats minimum.
Substrate (1=smooth, 2=broom, 3=block, 4=rough): Surface texture affects material absorption. Rougher surfaces need more material.
Side (1=positive, 2=negative): 1 = Positive side (water-facing, exterior). 2 = Negative side (dry side, interior).
Water pressure (PSI): Expected hydrostatic water pressure. 1 ft of head = 0.433 PSI.

Material needed (lbs/bags/kits): Total material units including 10% waste. Units depend on product type.
Mix water (gallons): Water needed for mixing (crystalline and cementitious coatings).
Material cost ($): Estimated material cost based on average pricing.
Total DFT (mils): Total dry film thickness from all coats. Crystalline penetrates — no measurable film.
Max pressure rating (PSI): Maximum hydrostatic pressure the selected system can withstand.
Pressure adequate: Whether the selected system can handle the specified water pressure.
Estimated labor (hours): Approximate labor hours for one worker to apply all coats.

Identify Input Parameters
4 parameters
Surface area (sq ft) = 500, Product (1=crystalline, 2=coating, 3=polymer) = 1, Number of coats = 2, Substrate (1=smooth, 2=broom, 3=block, 4=rough) = 2 = 6 input(s) provided
Calculate Material needed
Material needed = unitsNeeded + wasteUnits
22 = 22
Calculate Mix water
Mix water = unitsNeeded * mixWaterGalPerUnit
0.8 = 0.8
Calculate Material cost
Material cost = totalUnitsWithWaste * costPerUnit
77 = $77