Crawl Space Vapor Barrier Calculator
Estimate crawl-space vapor-barrier area and roll quantity for the floor, perimeter walls and support piers with an editable overlap allowance.
Default project preview
2 rolls
Ground coverage
1,000 ft²
Perimeter walls
260 ft²
Support piers
96 ft²
Order area
1,627.2 ft²
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.
Base area = ground area + perimeter-wall coverage + pier wrap area. Order area includes overlap/detailing allowance. Rolls are rounded up by roll coverage.
BuildMeter Guides
Understand the measurements and assumptions
Use these visible reference guides before changing project inputs or planning allowances.
FAQ
Crawl Space Vapor Barrier Calculator questions
Should the barrier extend up foundation walls?+
Many systems include wall coverage, but the required height and termination method depend on the design and local requirements.
Why include pier wrap area?+
Support piers interrupt the floor membrane and may require vertical material and sealed transitions.
Does this calculate seam tape?+
No. Tape and sealant depend on sheet layout, seams, penetrations and perimeter detailing.