Roof insulation thermal resistance at roof perimeter should be equal or greater to thermal resistance of exterior wall.
Vent foam insulated attic.
Heat from the house rises up to the attic but when there isn t one the heat rises up to the roof.
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.
Oh and when you put it in your attic spray foam.
All insulation materials require proper venting.
The recommended ventilation ratio to provide for vented attic assemblies when an air barrier is present is the 1 300 ratio as specified by most building codes.
Foam insulation can play an important role in both vented and un vented roof assemblies.
In an un vented roof foam can serve as the air barrier and vapor retarder and prevent moisture from getting in to the roof.
Cathedral roofs especially need a lot more insulation between the ceiling and the rafters because there usually isn t any attic space.
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Affix rigid foam insulation to the attic side of the hatch or door.
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.
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.
Many homeowners love spray foam insulation and it s easy to understand why.
This alternative to traditional building insulation fiberglass can be applied into wall cavities holes concrete slabs and even onto roof tiles and.
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Rigid foam and spray foam are two of them.
Add weatherstripping around the perimeter and a sweep to the door of a walk up attic.
Earlier this year i got a question about a home that had spray foam insulation in the attic.
Pull down stair or ladder.
Attic hatch or door.
Nothing unusual about that.
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.
In a vented roof foam can seal the openings and serve as an air barrier and a vapor retarder in addition to its insulating function.
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