Vapour Barrier Calculator
Determine the required vapour barrier permeance, type, and installation side based on climate zone and wall type.
How to Use the Vapour Barrier Calculator
- Select your climate zone (1 = hot, 5 = very cold).
- Select the wall construction type.
- Click Calculate to see the recommended vapour barrier specification.
Casi d'Uso
- •Selecting appropriate vapour control layers for new construction.
- •Retrofitting existing walls with correct vapour barrier products.
- •Compliance with building code moisture control requirements.
- •Preventing interstitial condensation in wall assemblies.
Formula
Required permeance is determined by climate zone; barrier type and installation side depend on wall construction material.
Domande Frequenti
What is vapour permeance?
Permeance measures how much water vapour passes through a material per unit time. Lower values mean better vapour control.
Which side should the vapour barrier be installed?
In cold climates, the barrier should be on the warm (interior) side to prevent moisture from entering wall cavities.
Is it free?
Yes, all calculators on OhMyCalc are completely free.