Insulating A Cathedral Ceiling With Rigid Foam

Minimize penetrations to the ceiling and especially avoid recessed ceiling lights which have been the cause of numerous moisture problems in cathedral ceilings with or without vent channels.

Insulating a cathedral ceiling with rigid foam.

Johns manville aptm foil faced insulation sheathing board is an excellent choice for insulating attics and cathedral vaulted ceilings. Rigid foam board installation in the case of a cathedral ceiling involves installing three different layers that are each 1 5 inches thick according to the procedure discussed in this article appearing in fine homebuilding. When applied to the. Putting an addition on cathedral ceiling pitch is 12 12 with 2 10 rafters.

Foil faced iso board can be cost effective insulation for finished attics and cathedral ceilings. Unvented roof assemblies should be insulated either with air impermeable insulation rigid foam or spray polyurethane foam or with a combination of foam and air permeable insulation. Treat your cathedral ceiling just like a wall with a different angle. In most cases however insulation will not help prevent moisture.

Advantages of rigid foam insulation under the roof. Vented ceiling across rafters. The rigid foam layers are installed with staggered seams. Vent channel separated from the insulation by a foam cardboard or plywood baffle and provide balanced.

Seal all ceiling openings. If you don t want to use sips or nailbase read this article tolearn the four basic approaches to insulating unvented roof assemblies. Closed cell foam ceiling insulation in a vaulted ceiling offers substantial advantages over open cell. Foam board insulation would be a more economical especially if you are supplying the labor see photo.

Above the insulation leave a 1 1 2 in. Using foam it green spray foam insulation in your cathedral ceiling can give you much. Attics and cathedral vaulted ceilings. Husband wants to do rigid foam boards double and triple layer have a friend who takes used foam boards out of steel commercial buildings we can pick and choose our boards.

Regular ceilings are likely to be under. Spray foam is a very expensive option however. About the only time you are likely to add rigid insulation to a ceiling is in a retrofit of a cathedral ceiling. First closed cell foam has a 60 percent higher r value per inch than open cell 6 3 vs.

Check the joists and wall plates for any holes or openings. Polyiso provides one of the highest r values per inch of any rigid insulation r 6 at 1 inch. Spray foam closed cell is way out of our budget. Insulate a cathedral ceiling by ensuring there is no opportunity for drafts to get into the room.

Check out the overhead project video to get some tips and techniques to make this project easier. Stand on a ladder and using a caulk gun seal any areas where there is visible wiring or plumbing. Foam it green spray foam bonds overhead.