Vaulted Ceiling Insulation Detail

Hi can someone tell me the best technique for insulating a vaulted ceiling.

Vaulted ceiling insulation detail.

That is create a vent channel above the insulation with low and high vents. Another type of roof insulation is spray foam insulation although. In fact as far back as 1975 ncima standard n 301 75 stated. Yes a cathedral ceiling detail would be very similar but the challenge of many cathedral ceilings is the added structural elements electrical boxes and the desire for wood board ceilings all which start compromising the drywall layer which in your detail is used at the air barrier.

Without fresh air from the soffit vents your roof top vents such as. Utilizing cellulose insulation contractors blow the cathedral ceiling cavity completely full and do away with the need for outside ventilation. Vaulted ceilings bring a sense of openness to a home. While fiberglass insulation is an excellent and effective product for insulating most building cavities in areas where there is extra risk of trapping moisture and thus rot or mold infections such as crawl spaces and cathedral ceilings where roof venting may be absent or minimal we prefer to use closed cell foam insulation products or spray.

Among the easiest options is to install rigid insulation sheets over the rafters which not only provides insulation but also the structural function of enclosing the roof. In a vaulted ceiling however the only fresh air route lies between the insulation and the underside of the roof deck. Without an attic baffle there will not be any air space for fresh air to enter the attic from the soffit vents. I have spoken to an insulation company and they have said the reason for putting insulation under the rafters is to stop thermal bridging as there is not much thermal properties within an 8x2.

A cathedral ceiling is a sloping and pointed ceiling which is usually high and open. You ll want a tight ceiling air barrier with no air leakage into the cathedral ceiling a critical detail for all cathedral ceiling designs. The architect has specifies 140mm between the rafters and 50mm under. Cathedral ceilings are a feature in many homes that add to value to the house because the high ceiling tends to make rooms look larger.

Find out why and if it s worth it. Then insulate below with fiberglass or cellulose add a vapor retarder and your finish ceiling. To keep fiberglass batts from blocking airflow rafter baffles should be. Cathedral vaulted or any ceiling that has insulation blocking the airflow from the soffit vents to the attic needs an attic baffle in each rafter bay.

There are several options for installing insulation in a vaulted ceiling.