Insulating Vaulted Ceiling Rigid Foam

First closed cell foam has a 60 percent higher r value per inch than open cell 6 3 vs.

Insulating vaulted ceiling rigid foam.

Regular ceilings are likely to be under. Johns manville aptm foil faced insulation sheathing board is an excellent choice for insulating attics and cathedral vaulted ceilings. Attics and cathedral vaulted ceilings. He wants a trouble free roof assembly but local advice on insulation and air sealing has been hard to find.

The roof starts with scissor trusses set on 8 foot centers. Foam board insulation would be a more economical especially if you are supplying the labor see photo. When applied to the. Advantages of rigid foam insulation under the roof.

Polyiso provides one of the highest r values per inch of any rigid insulation r 6 at 1 inch. Putting an addition on cathedral ceiling pitch is 12 12 with 2 10 rafters. Vented ceiling across rafters. How to attach rigid insulation to ceilings.

Spray foam is a very expensive option however. Vaulted ceilings require venting as well as insulation. A less expensive alternative is the more traditional vented cathedral ceiling insulated with fiberglass cellulose or open cell foam. 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.

The rigid foam layers are installed with staggered seams. About the only time you are likely to add rigid insulation to a ceiling is in a retrofit of a cathedral ceiling. Insulating a vaulted ceiling is similar to insulating exterior walls with one notable difference. Spray foam closed cell is way out of our budget.

In most cases however insulation will not help prevent moisture. Closed cell foam ceiling insulation in a vaulted ceiling offers substantial advantages over open cell. 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. The higher r value reduces condensation when moist interior air hits the now less cold ceiling vice versa in summer with humid outside air.

Foil faced iso board can be cost effective insulation for finished attics and cathedral ceilings. Kevin is working up the design for a new lakeside cabin in tennessee with plans currently calling for a scissor truss roof and a vaulted ceiling over the kitchen and living area.