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build.waterproofing-membrane Calculator
Calculates the number of waterproofing membrane layers, adhesive, and lap coverage for a given substrate area. A single defect in a below-grade waterproofing membrane can result in uncontrolled water infiltration — proper lap width (typically 150 mm) is critical.
Inputs
Area M2
Two-dimensional surface extent (m²). For complex shapes, break into simpler sub-shapes and sum.
Layers
Reference formula or conversion factor shown for context.
Overlap Pct
Reference formula or conversion factor shown for context.
Primer Coverage M2
Age in completed years. Many health and fitness formulas adjust for age.
Results
membrane area per layer (m²)
The computed two-dimensional surface area.
total membrane (m²)
The combined total across all inputs and components.
primer needed (L)
Sample size or count used in the calculation.
overlap allowance
Sample size or count used in the calculation.
layers
Number of stacked components or structural layers in the design.
typical spec
Reference formula or conversion factor shown for context.