Insulating Vaulted Ceiling Rigid Foam

This is best for simple cathedral ceilings that are easy to ventilate.

Insulating vaulted ceiling rigid foam.

R value insulation receives a rating. 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. The rigid foam layers are installed with staggered seams. He wants a trouble free roof assembly but local advice on insulation and air sealing has been hard to find.

About the only time you are likely to add rigid insulation to a ceiling is in a retrofit of a cathedral ceiling. These should have straightforward framing with no skylights and with direct access to soffit and ridge vents. A less expensive alternative is the more traditional vented cathedral ceiling insulated with fiberglass cellulose or open cell foam. Insulating a vaulted ceiling is similar to insulating exterior walls with one notable difference.

Johns manville aptm foil faced insulation sheathing board is an excellent choice for insulating attics and cathedral vaulted ceilings. Attics and cathedral vaulted ceilings. Vented ceiling across rafters. When applied to the.

First closed cell foam has a 60 percent higher r value per inch than open cell 6 3 vs. The roof starts with scissor trusses set on 8 foot centers. Closed cell foam ceiling insulation in a vaulted ceiling offers substantial advantages over open cell. Regular ceilings are likely to be under.

In most cases however insulation will not help prevent moisture. Advantages of rigid foam insulation under the roof. 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.

Vaulted ceilings require venting as well as insulation. 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. 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. Putting an addition on cathedral ceiling pitch is 12 12 with 2 10 rafters.

How to attach rigid insulation to ceilings. Foam board insulation would be a more economical especially if you are supplying the labor see photo.