Vented Cathedral Ceiling Insulation

Straight bays 2x12 24 o c.

Vented cathedral ceiling insulation.

The current plan is to use batts of some kind in the bays take care to air seal the interior surface avoid penetrations air seal the vent channel too bays fully sealed double prime the inside surface for vapor resistance. 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. In fact as far back as 1975 ncima standard n 301 75 stated. That is create a vent channel above the insulation with low and high vents.

Have a newly framed vented cathedral ceiling to insulate. A cathedral ceiling is a sloping and pointed ceiling which is usually high and open. It provides an open airy look and feel to the room and they are often in demand among home buyers. Although many view this as a new method as stated previously many contractors have been doing this for years.

You ll want a tight ceiling air barrier with no air leakage into the cathedral ceiling a critical detail for all cathedral ceiling designs. Cathedral ceiling ventilation design guide how should i vent a cathedral ceiling. In particular using fiberglass insulation in an un vented cathedral ceiling is most likely to give way to discovery of advanced hidden damage and or mold over the life of the building and may give shorter roof shingle life as well as causing higher indoor temperatures than with a vented roof cavity design. Then insulate below with fiberglass or cellulose add a vapor retarder and your finish ceiling.

Utilizing cellulose insulation contractors blow the cathedral ceiling cavity completely full and do away with the need for outside ventilation.