Vented Cathedral Ceiling Insulation
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Vented cathedral ceiling insulation. There are big overhanging eaves that can be opened to look up into the cavities. Although many view this as a new method as stated previously many contractors have been doing this for years. Suggestions for un vented or hard to vent building roof cavities. Should i install an air barrier in the cathedral ceiling above the insulation.
Musings of an energy nerd how to build an insulated cathedral ceiling whether you decide to make it vented or unvented get the details right because every cathedral ceiling offers opportunities to make big mistakes. It is unvented for the most part. I bought a house with a vaulted ceiling. Hi i have a 1920s bungalow where the cathedral ceiling of the second story is uninsulated.
Cathedral ceilings are a feature in many homes that add to value to the house because the high ceiling tends to make. This type of roof assembly is designed so the air can flow up the soffit vent through an insulation baffle pass through the 15 gap between the insulation and roof sheathing then exit through a ridge vent. I can access the rafter space from behind the knee walls and was planning on insulating with fiberglass insulation and venting. I want to insulate it but dont want to tear off the roof which is relatively new or the ceiling.
Drywall is nailed to 2x6 roof rafters. A cathedral ceiling is a sloping and pointed ceiling which is usually high and open. Worries about the hot. Does air movement wind washing through a vented cathedral ceiling cause heat loss through the insulation.
Cathedral ceilings built using 2 x 12 roof rafters allow enough space for the fiberglass batt insulation and a 15 gap for ventilation. I have no idea what kind of insulation is up there. A less expensive alternative is the more traditional vented cathedral ceiling insulated with fiberglass cellulose or open cell foam. This is best for simple cathedral ceilings that are easy to ventilate.
These have straightforward framing with no skylights and with direct access to soffit and ridge vents. In fact as far back as 1975 ncima standard n 301 75 stated. Utilizing cellulose insulation contractors blow the cathedral ceiling cavity completely full and do away with the need for outside ventilation.
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