Vapor Barrier

6-mil poly: floor + optional walls; 10% overlap on floor; 4×100 ft rolls.

Length (ft)

Width (ft)

Walls

Wall h (ft)

Tab to move between fields

Poly ft²

1,355.2

4'×100' rolls4

How to Use This Calculator

Enter the crawlspace length and width in feet.
Select whether you are covering the floor only or the floor plus walls.
If covering walls, enter the crawlspace wall height in feet.
Read the total poly sheeting area in sq ft (including 10% floor overlap) and the number of 4×100 ft rolls to purchase.

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