Energy glossary
What is VAPOR BARRIER?
VAPOR BARRIER — A material with a permeance of one perm or less which provides resistance to the transmission of water vapor. [See California Code of Regulations, Title 24, Section 2-5302]
Energy glossary
VAPOR BARRIER — A material with a permeance of one perm or less which provides resistance to the transmission of water vapor. [See California Code of Regulations, Title 24, Section 2-5302]