"Vapor retarders" refers to materials or barriers that slow down the movement of water vapor through walls, floors, or roofs. They help prevent unwanted moisture from entering a space and potentially causing damage or mold growth. Full definition
The third product I will mention briefly is the Intello Plus interior vapor retarder. (rockymountaintinyhouses.com)
The tight building envelope of the house is made up of a 14 - inch cellulose insulation, a high - performance Intello vapor retarder, FSC - certified plywood, locally - sourced reclaimed barn wood, and Huber Zip panels, which are used in the 48 wall panels and provide an integrated sheathing - air penetration barrier to ensure a tight, leak - free envelope. (jetsongreen.com)
It features an unvented roof with open - cell spray foam insulation and vapor retarder paint or coating, or alternatively, closed - cell spray foam insulation in rafter cavities, and asphalt shingles. (buildingscience.com)