Concrete Vapor Barrier Calculator
Estimate concrete vapor-barrier rolls, purchased membrane area, approximate seam length, surplus and material cost from slab dimensions and roll coverage.
Default project preview
2 rolls
Slab area
1,500 ft²
Order area
1,725 ft²
Coverage per roll
1,500 ft²
Approximate strips
2
Calculator
Build the material order
Your order will appear here
Enter the project details and calculate a rounded material estimate.
Methodology
Transparent calculation
BuildMeter converts every input to a consistent internal unit, applies the selected allowance, and rounds products up to whole purchasable units.
Slab area = length × width. Order area = slab area × overlap/waste factor. Rolls = round up (order area ÷ roll area).
BuildMeter Guides
Understand the measurements and assumptions
Use these visible reference guides before changing project inputs or planning allowances.
FAQ
Concrete Vapor Barrier Calculator questions
Why include overlap and waste?+
Sheet overlaps, perimeter turns, penetrations, cuts and damaged areas increase membrane usage beyond the flat slab area.
Does this calculate seam tape?+
It provides an approximate straight seam length only. Perimeter, penetrations and repair patches require additional tape and accessories.
Can any plastic sheet be used?+
Material selection depends on the project specification and expected service conditions. Confirm the exact membrane product before ordering.