Free Construction Calculators & Tools/Waterproofing Calculator

Waterproofing Calculator

Calculate waterproofing material quantities for roofs, basements, and wet areas. Supports liquid membranes, sheet membranes, bitumen, and cementitious coatings with primer and overlap calculations.

Surface Specifications

Total area requiring waterproofing

Coverage: 1.5 kg/m²

Additional Options

Linear meters of joints, corners, and penetrations for tape/sealant

System Comparison
Liquid Membrane1.5 kg/m²
Sheet Membrane (APP/SBS)1.1 m²/m²
Cementitious Coating3 kg/m²
Bitumen Emulsion2 kg/m²
Polyurethane1.2 kg/m²

Enter surface specifications and click Calculate to see materials

Notes:

  • Liquid membranes typically require 2 coats minimum
  • Sheet membranes need 100mm min overlap at joints
  • Primer is essential for proper adhesion
  • Allow proper curing between coats
  • Consider weather conditions during application
Save Your Calculation
Get a professional PDF report of this calculation, plus access to templates and additional resources.

ESTIMATION NOTICE

This calculator provides APPROXIMATE QUANTITIES for budgeting and planning purposes.

Please note:

• Results include standard wastage factors but actual waste may vary based on site conditions, workmanship, and material quality.

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