Open Cell Spray Foam Cathedral Ceiling

It is also one of the most expensive and most building inspectors will not allow it to be left uncovered for fire code reasons.

Open cell spray foam cathedral ceiling. This makes the foam a softer more flexable material. This is more common with closed cell foam but it happens with open cell foam too. Spray foam isn t thick enough. Using foam it green spray foam insulation in your cathedral ceiling can give you much.

When framing the roof of a cathedral ceiling use 2 x 10 lumber for the roof rafters. Insulating a cathedral ceiling with foam it green. Spray foam contracts and pulls away from framing. Spray foam installers missed some of the air leakage sites.

Foam it green spray foam bonds overhead. A less expensive alternative is the more traditional vented cathedral ceiling insulated with fiberglass cellulose or open cell foam. Assuming you have full access to the joist spaces from below you could certainly spray foam up against the roof sheathing. Here s how you do it.

The extra depth of traditional 2 x 12 rafters is not needed. Spray foam installers didn t understand the building envelope and sprayed either too little or too much. Open cell foam is full of cells that aren t completely encapsulated. The higher r value reduces condensation when moist interior air hits the now less cold ceiling vice versa in summer with humid outside air.

In other words the cells are deliberatly left open. Hi we are building a new home where the great room section has a cathedral ceiling with dormers on each side. 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. Closed cell foam ceiling insulation in a vaulted ceiling offers substantial advantages over open cell.

We are in climate zone 4a and we used zip roof. First closed cell foam has a 60 percent higher r value per inch than open cell 6 3 vs. 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. Check out the overhead project video to get some tips and techniques to make this project easier.

This is best for simple cathedral ceilings that are easy to ventilate. 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. In general closed cell foam is the best choice for unvented cathedral ceilings. 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.