Insulating Vaulted Ceiling Rigid Foam

He wants a trouble free roof assembly but local advice on insulation and air sealing has been hard to find.

Insulating vaulted ceiling rigid 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. 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. R value insulation receives a rating.

Johns manville aptm foil faced insulation sheathing board is an excellent choice for insulating attics and cathedral vaulted ceilings. Vaulted ceilings require venting as well as insulation. 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.

Foam board insulation would be a more economical especially if you are supplying the labor see photo. Spray foam is a very expensive option however. The roof starts with scissor trusses set on 8 foot centers. Polyiso provides one of the highest r values per inch of any rigid insulation r 6 at 1 inch.

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. Vented ceiling across rafters. Insulating a vaulted ceiling is similar to insulating exterior walls with one notable difference. Putting an addition on cathedral ceiling pitch is 12 12 with 2 10 rafters.

A less expensive alternative is the more traditional vented cathedral ceiling insulated with fiberglass cellulose or open cell foam. In most cases however insulation will not help prevent moisture. About the only time you are likely to add rigid insulation to a ceiling is in a retrofit of a cathedral ceiling. Closed cell foam ceiling insulation in a vaulted ceiling offers substantial advantages over open cell.

These should have straightforward framing with no skylights and with direct access to soffit and ridge vents. How to attach rigid insulation to ceilings. Advantages of rigid foam insulation under the roof. This is best for simple cathedral ceilings that are easy to ventilate.

Regular ceilings are likely to be under. Attics and cathedral vaulted ceilings.