Spray Foam Insulation Attic Ventilation

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.

Spray foam insulation attic ventilation. Polyurethane spray foam insulation acts as an air barrier sealing off the hundreds of cracks and crevices that lets your conditioned air out and the outside air in. The point i m making here is that a sealed attic should be well all sealed up. Unvented attic assemblies unvented attics rely on an air impermeable insulation installed to the roof deck s underside i e. Insulation is used in an attic for cross ventilation to minimize potential for moisture accumulation and condensation to help energy savings and moisture control.

The spray foam expands on contact filling up the space where it begins working immediately. A case of incompatibility. Oh and when you put it in your attic spray foam insulates the attic itself. 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.

One of the biggest benefits of using spray foam is to get greater airtightness. Spray foam from home logic is an excellent insulation type to choose for the attic. Traditional insulating materials can t do that. A lot of builders and homeowners are going with spray foam insulation because of the airtightness benefits.

Actually you should probably get rid of power attic ventilators whether or not you re sealing the attic but that s another article. Attic ceiling to stop airborne moisture from reaching a cold surface and condensing inside the building envelope in this design insulation effectively separates the interior and exterior spaces while slowing down moisture flow so the dewpoint is not achieved within. Spray foam is eco friendly non toxic and thermally efficient. Nothing unusual about that.

But then the questioner mentioned that the spray foam contractor had intentionally left big holes to the outside by not sealing the gable vents.