Insulating Vaulted Ceiling Rigid Foam

Vaulted ceilings require venting as well as insulation.

Insulating vaulted ceiling rigid foam.

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. Johns manville aptm foil faced insulation sheathing board is an excellent choice for insulating attics and cathedral vaulted ceilings. Polyiso provides one of the highest r values per inch of any rigid insulation r 6 at 1 inch. Foam board insulation would be a more economical especially if you are supplying the labor see photo.

Advantages of rigid foam insulation under the roof. Attics and cathedral vaulted ceilings. The higher r value reduces condensation when moist interior air hits the now less cold ceiling vice versa in summer with humid outside air. How to attach rigid insulation to ceilings.

When applied to the. R value insulation receives a rating. He wants a trouble free roof assembly but local advice on insulation and air sealing has been hard to find. 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. The roof starts with scissor trusses set on 8 foot centers. A less expensive alternative is the more traditional vented cathedral ceiling insulated with fiberglass cellulose or open cell foam. These should have straightforward framing with no skylights and with direct access to soffit and ridge vents.

Putting an addition on cathedral ceiling pitch is 12 12 with 2 10 rafters. 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. In most cases however insulation will not help prevent moisture. Foil faced iso board can be cost effective insulation for finished attics and cathedral ceilings.

First closed cell foam has a 60 percent higher r value per inch than open cell 6 3 vs. Regular ceilings are likely to be under. The rigid foam layers are installed with staggered seams. 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.

Spray foam closed cell is way out of our budget. Insulating a vaulted ceiling is similar to insulating exterior walls with one notable difference.