Should I Put Plastic Over Insulation? No – Avoid Double Vapor Barriers
The answer isn’t a simple yes or no, it depends entirely on your climate zone and wall assembly. In colder regions (climate zones 5 through 8 and Marine 4), building codes actually require a Class I or II vapor retarder on the interior side of framed walls. In warmer southern climates (zones 1-3), vapor barriers … Read more