Open Cell Spray Foam Cathedral Ceiling

Check out the overhead project video to get some tips and techniques to make this project easier.

Open cell spray foam cathedral ceiling.

The higher r value reduces condensation when moist interior air hits the now less cold ceiling vice versa in summer with humid outside air. The extra depth of traditional 2 x 12 rafters is not needed. A spray insulation is referred to open cell or closed cell because of the difference between the small bubbles cells that make up the foam. A less expensive alternative is the more traditional vented cathedral ceiling insulated with fiberglass cellulose or open cell foam.

Hi we are building a new home where the great room section has a cathedral ceiling with dormers on each side. Spray foam isn t thick enough. When framing the roof of a cathedral ceiling use 2 x 10 lumber for the roof rafters. Spray foam installers missed some of the air leakage sites.

Spray foam contracts and pulls away from framing. This is more common with closed cell foam but it happens with open cell foam too. Here s how you do it. Foam it green spray foam bonds overhead.

Using foam it green spray foam insulation in your cathedral ceiling can give you much. These should have straightforward framing with no skylights and with direct access to soffit and ridge vents. This is best for simple cathedral ceilings that are easy to ventilate. We are in climate zone 4a and we used zip roof.

In other words the cells are deliberatly left open. Closed cell foam ceiling insulation in a vaulted ceiling offers substantial advantages over open cell. Cathedral ceilings spray foam insulation. In general closed cell foam is the best choice for unvented cathedral ceilings.

It is also one of the most expensive and most building inspectors will not allow it to be left uncovered for fire code reasons. Insulating a cathedral ceiling with foam it green. Open cell foam is full of cells that aren t completely encapsulated. If you re concerned about how you should be insulating cathedral ceilings icynene spray foam insulation is the ideal choice since it can aid in early detection of situations such as roof leaks and wind driven moisture intrusion icynene spray foam ca be applied to insulate any space or unique angle.

Treat your cathedral ceiling just like a wall with a different angle. Most experts agree that closed cell foam is best for unvented cathedral ceilings while vented cathedral ceilings can be insulated with less expensive open cell foam. First closed cell foam has a 60 percent higher r value per inch than open cell 6 3 vs. We are planning on spray foaming the underside side of the roof deck and the insulation contractor is suggesting open cell foam because if the roof ever leaked with closed cell foam it would go undetected and the roof would rot.