Moisture Control Calculator

Size crawl space vapor barriers, ventilation per IRC R408.1, dehumidifier capacity, and estimate encapsulation or vented system costs.

Crawl space area (ft²)

Crawl space height (ft)

System type (0=Vented, 1=Encapsulated)

Barrier thickness (mil)

Current humidity (%)

Target humidity (%)

Tab to move between fields

Vapor barrier needed (ft²)

1,777

Total project cost ($)

$4,357.15

Barrier material cost ($)$284.36

Foundation vents needed0

Dehumidifier capacity (pints/day)24

Dehumidifier cost ($)$992

Sump pump recommended (1=Yes)0

Installation labor ($)$3,000

Total material cost ($)$1,357.15

Cost per ft² ($)$3.63

Crawl Volume Cu (ft)3,600

How to Use This Calculator

Enter crawl space area in square feet and measured relative humidity percentage.
Input the number of foundation vents and their total open area in square inches.
Set the vapor barrier coverage percentage over the crawl space soil.
Review the Moisture Risk Level and the Recommended Dehumidifier Capacity in pints per day.
Use the Ventilation Rate output to determine if additional vents or mechanical ventilation are needed.

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