Vapor Permeance - a podcast by ProTradeCraft.com

Vapor permeance is the property of a material – and in our discussions this will be building materials – which permits the passage of water vapor through it.
Today's guest is Jonathan Smegal of RDH Building Science Laboratories...
Some materials have high vapor permeance which means they allow a lot of water vapor to pass and other materials have significantly less vapor permeance, so they block water vapor movement and these are called vapor barriers or vapor retarders."

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