Spray Foam Attic Insulation Ventilation

A lot of builders and homeowners are going with spray foam insulation because of the airtightness benefits.

Spray foam attic insulation 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. Cathedral roofs especially need a lot more insulation between the ceiling and the rafters because there usually isn t any attic space. Oh and when you put it in your attic spray foam insulates the attic itself. Air sealing also reduces the natural ventilation rate or air leakage rate further reducing heating and cooling loads.

All insulation materials require proper venting. The case for unvented attics. 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.

Actually you should probably get rid of power attic ventilators whether or not you re sealing the attic but that s another article. Spray foam from home logic is an excellent insulation type to choose for the attic. One of the biggest benefits of using spray foam is to get greater airtightness. Spray foam is applied directly where it s needed ensuring that any ventilation vents are left untouched.

Only spray polyurethane foam can be used for this application as batt insulation will end up sagging and blown insulation simply can t adhere to the roof decking. That means you get rid of all attic ventilation whether it s passive ridge gable soffit vents or active fans. But then the questioner mentioned that the spray foam contractor had intentionally left big holes to the outside by not sealing the gable vents. Spray foam is eco friendly non toxic and thermally efficient.

A combination of air sealing and insulating the attic floor while providing ventilation considerably reduces potential for condensation as warm moist air is less likely to enter the space and condense on cold surfaces. Becoming more affordable significant long term energy savings sealing restricts air movement through the building envelope. Spray foam insulation has been increasing in popularity over the last several years due to. This application effectively seals off the attic from the outdoors and eliminates air leakage and infiltration through the attic and roof areas.

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.