Proper Insulation For Vaulted Ceiling

In the knee wall area the insulation is in the floor and on the back of the knee wall.

Proper insulation for vaulted ceiling.

Straight bays 2x12 24 o c. Some builders rely on batts with attached kraft paper facing to do that job but tom recommends unfaced batts covered in plastic with all the seams taped shut. Have a newly framed vented cathedral ceiling to insulate. In most climates it needs a vapor barrier.

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. Be sure to seal around any pvc pipes as well. Fiberglass insulation comes in lightweight batts and rolls precut to widths that match standard stud and rafter spacing. Stand on a ladder and using a caulk gun seal any areas where there is visible wiring or plumbing.

Then you need to determine the amount of material needed for your ceiling. How to insulate a vaulted ceiling installing a vaulted ceiling requires careful consideration of the building codes in your area. A vent baffle should be installed between the insulation and the roof decking to maintain the ventilation channel. Like other batt type insulation fiberglass has a predictable r value if not compressed but is difficult to fit around obstacles without leaving gaps.

This density prevents air from carrying damp into the insulation. Nail 1 furring along every rafter side against the roof deck. Insulating a vaulted ceiling is similar to insulating exterior walls with. How should you insulate.

Seal all ceiling openings. Foil faced batt insulation is often used in cathedral ceilings because it provides the permeability rating often required for use in ceilings without attics. You also need to make sure that you are leaving at least 2 inches of breathing space between the insulation and the roof sheathing. Cellulose insulation s higher r value is very important in limited space areas such as a cathedral ceiling cavity.

After you ve reduced humidity problems in your home then air sealed the ceiling between the living space and the attic cathedral ceiling then you can insulate. Cut and insert 1 or thicker high r foam insulation sheets r 8 per inch against the furring giving a 1 or greater air path between the insulation and the roof deck under the cathedral ceiling. This will protect the room from air infiltration and will also suppress fires. Check the joists and wall plates for any holes or openings.

However don t make the mistake of using a lot of foam spray insulation as this stuff is expensive.