Building Materials - Vapour Resistance

Diffusion of vapor through building materials. Calculate vapor resistance based on material thickness and vapor resistivity.

Calculator

Thickness of Material (m)

Vapor Resistivity (G Ns/(kg m))

Vapor Resistance-- Ns/kg

Material	Vapor Resistivity (G Ns/(kg m))
Brickwork	45 - 70
Concrete blocks, light weight	15 - 150
Render	100
Plaster, cement	75 - 205
Wood, pine	45 - 1850
Plywood	150 - 2000
Fiberboard	15 - 375
Hardboard	230 - 1000
Plasterboard	30 - 60
Straw-board, compressed	45 - 70
Wood-wool, slab	15 - 40
Polystyrene, expanded	100 - 750
Glass wool	5 - 7
Phenolic, closed cells	150 - 750
Gloss paint, average	40 - 200
Polyethylene sheet	110 - 120
Aluminum foil	4000