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I have a spray foamed attic.
Do attics require ventilation with spray foam insulation. Here s the answer to the question posed in my article title. They need the right level of ventilation but they also require insulation in order to help improve the energy efficiency of the property. This spray foam is applied as a low or high pressure two component polyurethane spray foam that can be applied onto walls in unvented attics to ducts and ceilings and in vented attics and crawl spaces. Nope you absolutely do not need to ventilate a spray foam house and here s why.
Unvented attic assemblies unvented attics rely on an air impermeable insulation installed to the roof deck s underside i e. Because basically now that attic is a conditioned space. Compared to traditional insulation whether fiberglass or cellulose spray foam has the potential to provide better performance via its air sealing properties high r values per inch of thickness and in the case of closed cell spray foam ability to repel moisture. It is also known to act as an air barrier however unfortunately it will not protect against vapor and moisture intrusions.
The ventilation helps to keep the air fresh in the home the insulation stops warm air from escaping and cold air from leaking in. Yes using spray foam we have added your attic to the conditioned space. Oh and when you put it in your attic spray foam insulates the attic itself. When we seal the attic with spray foam it s as tight as a butter tub.
Do attics with spray foam insulation need ventilation.
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