Waterproofing membrane calculator
Reduce gross roll coverage by the share consumed by laps and detailing, then round up to full rolls.
Shopping estimate
Enter your measurements to see an estimate.
How it works
Reduce gross roll coverage by the share consumed by laps and detailing, then round up to full rolls.
Worked example
- Net area
- 35 m²
- Roll width
- 1 m
- Length per roll
- 10 m
- Coverage lost to overlaps
- 10 %
- Waste allowance
- 5 %
Result 5 rolls