How to Insulate a Cathedral Ceiling

Last Updated: July 26, 2020 References

A cathedral ceiling is a sloping and pointed ceiling which is usually high and open. 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. It provides an open, airy look and feel to the room and they are often in demand among home buyers. While many people think they look nice, providing insulation can sometimes be a challenge due to the extra space between the ceiling and the floor. Insulate a cathedral ceiling by ensuring there is no opportunity for drafts to get into the room.

Steps

1
Seal all ceiling openings. Stand on a ladder and using a caulk gun, seal any areas where there is visible wiring or plumbing. Check the joists and wall plates for any holes or openings. Be sure to seal around any PVC pipes as well. This will protect the room from air infiltration and will also suppress fires.
2
Install baffles on vents. Also called vent chutes, the baffles will make sure there is enough air flowing for ventilation needs. Baffles are available in prefabricated models, built to fit the measurements of your ceiling joists.^{[1]
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- Put the baffle between the joists, starting where they join at the exterior wall plate.
- Attach the baffles to the interior of the joists using a staple hammer and cover the wall plate area completely. There should be a 1 inch (2.54 cm) space beneath the plywood sheathing.
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3
Continue installing baffles until baffles are attached to all the vents.
4
Press the Kraft faced insulation batts between the joists. The side exposing the kraft paper must face downward. There must be at least 1 inch (2.54 cm) of space beneath the roof's plywood sheathing. This will ensure adequate airing.^{[2]
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5
Attach the paper flanges to the joists at the bottom by stapling them every 8 inches (20.32 cm). Keep the insulation at least 3 inches (7.62 cm) away from any sources of heat sources such as chimneys or recessed lights.^{[3]
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Method 1

Method 1 of 1:

Insulating With Unfaced Fiberglass Batts

1
Press the fiberglass batts between the joists. Leave at least 1 inch (2.54 cm) under the roof's plywood sheathing for adequate airing. There is nothing to staple with fiberglass batts.^{[4]
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2
Cover any gaps by cutting some scrap insulation that was not used and plug the holes.^{[5]
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Community Q&A

Question

What are some companies that do this work?

Dvortygirl

Community Answer

That depends on where you live. Most areas have local, independent people. Check the phone directory for insulation and roofing services, or ask around to your neighbors to find out if any of them have had similar work performed recently.