Closed Cell Foam Under Roof Deck at Jane Kristen blog

Closed Cell Foam Under Roof Deck. If closed cell insulation seals the underside of the roof deck, the moisture becomes trapped in the wood and can cause deterioration of the decking and framing over time. Both foam types work in most climates. Closed cell foam acts as both an air and vapor barrier so there is no moisture migration, and if the foam is thick enough, the inside surface of the foam will be warm enough that any indoor moisture won't condense. Cell or high density closed cell spray foam directly to the underside of the roof deck (figure 5). It also will perform better below or above grade.

Closed Cell Polyurethane Foam Applied to Metal Roof Deck YouTube
from www.youtube.com

Closed cell foam acts as both an air and vapor barrier so there is no moisture migration, and if the foam is thick enough, the inside surface of the foam will be warm enough that any indoor moisture won't condense. It also will perform better below or above grade. Both foam types work in most climates. Cell or high density closed cell spray foam directly to the underside of the roof deck (figure 5). If closed cell insulation seals the underside of the roof deck, the moisture becomes trapped in the wood and can cause deterioration of the decking and framing over time.

Closed Cell Polyurethane Foam Applied to Metal Roof Deck YouTube

Closed Cell Foam Under Roof Deck If closed cell insulation seals the underside of the roof deck, the moisture becomes trapped in the wood and can cause deterioration of the decking and framing over time. It also will perform better below or above grade. Both foam types work in most climates. Closed cell foam acts as both an air and vapor barrier so there is no moisture migration, and if the foam is thick enough, the inside surface of the foam will be warm enough that any indoor moisture won't condense. Cell or high density closed cell spray foam directly to the underside of the roof deck (figure 5). If closed cell insulation seals the underside of the roof deck, the moisture becomes trapped in the wood and can cause deterioration of the decking and framing over time.

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