Spray Insulation Attic Ventilation

Oh and when you put it in your attic spray foam insulates the attic itself.

Spray insulation attic ventilation.

Spray foam from home logic is an excellent insulation type to choose for the attic. Open cell spray polyurethane foam or closed cell spray polyurethane foam ccspf insulation can be sprayed along the underside of the roof sheathing to provide a conditioned and insulated attic space that can be durable and efficient in all climate zones see figure 1. Nope you absolutely do not need to ventilate a spray foam house and here s why. One of the biggest benefits of using spray foam is to get greater airtightness.

However in a traditionally insulated attic insulation on the ceiling the attic is vented. 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. In heating and cooling climates this moisture could potentially travel through fibre insulation in building cavities. The spray foam expands on contact filling up the space where it begins working immediately.

That means you get rid of all attic ventilation whether it s passive ridge gable soffit vents or active fans. Nothing unusual about that. Insulation is used in an attic for cross ventilation to minimize potential for moisture accumulation and condensation to help energy savings and moisture control. Earlier this year i got a question about a home that had spray foam insulation in the attic.

Actually you should probably get rid of power attic ventilators whether or not you re sealing the attic but that s another article. It s terrific because it s pretty much the same temperature as the rest of the house all the time. Spray foam is applied directly where it s needed ensuring that any ventilation vents are left untouched. Spray polyurethane foam will provide thermal insulation that will minimize air infiltration which can help to save on heating and cooling costs within the indoor environment.

I have a spray foamed attic. Spray foam is eco friendly non toxic and thermally efficient. When we seal the attic with spray foam it s as tight as a butter tub. A lot of builders and homeowners are going with spray foam insulation because of the airtightness benefits but then the questioner mentioned that the spray foam contractor had intentionally left big holes to the outside by not sealing the gable vents.