Calculate liner area, dehumidifier size and cost for crawl space encapsulation.
Liner covers both the floor and the walls up to the sill, and seams need generous overlap to stay sealed. A dehumidifier is required because an encapsulated crawl space no longer vents moisture to the outside. Encapsulating without dehumidification traps moisture rather than removing it, which makes conditions worse than leaving the space vented.
Crawl Space Encapsulation
Liner area = (floor area + perimeter × wall height) × (1 + overlap allowance)
Liner area = (floor area + perimeter × wall height) × (1 + overlap allowance) Liner covers both the floor and the walls up to the sill, and seams need generous overlap to stay sealed. A dehumidifier is required because an encapsulated crawl space no longer vents moisture to the outside.
Encapsulating without dehumidification traps moisture rather than removing it, which makes conditions worse than leaving the space vented.
This calculator takes 5 inputs: Crawl space floor area, Perimeter, Wall height, Liner overlap and waste, Installed cost per square metre. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.