Spray Foam Attic Ventilation

Becoming more affordable significant long term energy savings sealing restricts air movement through the building envelope.

Spray foam attic ventilation. Now we use attic ventilation when we use products like fiberglass because we have to manage the moisture. Ventilation and moisture control in spray foam homes spray foam insulation has been increasing in popularity over the last several years due to. Unvented attic assemblies unvented attics rely on an air impermeable insulation installed to the roof deck s underside i e. This alternative to traditional building insulation fiberglass can be applied into wall cavities holes concrete slabs and even onto roof tiles and.

Spray polyurethane foam is a chemical product that is created by two materials isocyanate and polyol resin that will react with each other when they are mixed and will expand up to 30 to 60 times its liquid volume as it is sprayed in place. 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. 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. Earlier this year i got a question about a home that had spray foam insulation in the attic.

That is now a conditioned part of your house just like any room in your house. What you re looking at there is the place where a power attic ventilator had been.