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.

How the result changes with Length (ft)

Length (ft): Interior length of the crawlspace in feet.
Width (ft): Interior width of the crawlspace in feet.
Walls: Choose whether to cover only the floor or the floor plus foundation walls for full encapsulation.
Wall h (ft): Height of the crawlspace foundation walls in feet. Only used if covering walls.

Identify Input Parameters
4 parameters
Length (ft) = 44, Width (ft) = 28, Walls = 0, Wall h (ft) = 3 = 4 input(s) provided
Calculate Poly ft²
Poly ft²
1355.2 = 1355.2

Engine last updated August 5, 2026. Checked against 2 independently-derived tests — how we verify calculators.

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