Building Science.com
You are here: Home → Glossary → Permeance
 
about this site
Building Physics
Thermal Control
Moisture Control
Air Flow Control
Climate
Acoustics
Light (ultraviolet radiation)
 
 

Permeance

The physical property that defines the ease at which water molecules diffuse through a material. It is to vapor diffusion what conductance is to heat transfer. The unit of measurement is typically the "perm."