Closed Cell Spray Foam Cathedral Ceiling

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Closed 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. Spray foam comes in two flavors open cell and closed cell and provides both parts of the building envelope the insulation and the air barrier. You just need to make sure you accommodate for the dew point so you don t have moisture issues. You don t want moist air leaking into the roof cavity.

Is it better to use icynene open cell or closed cell spray foam in an unvented cathedral ceiling. 3 5 inches foam it green closed cell r 24 5 6 inches fiberglass r 21. Cathedral ceilings spray foam insulation. First closed cell foam has a 60 percent higher r value per inch than open cell 6 3 vs.

A foams r value is its resistance to heat flow or in other words how well they insulate. I don t really like unvented cathedral ceilings also called hot roofs because they are very unforgiving if the roof sheathing or rafters ever gets wet from a roof leak or from indoor. We are building a new home in atlanta ga. Seal the insulation or the ceiling surface below against air leakage.

The building envelope should completely surround the conditioned space and the insulation needs to be in contact with the air barrier. Use closed cell spray foam closed cell foam board extruded polystyrene such as dow styrofoam or foil faced iso board. Closed cell foam ceiling insulation in a vaulted ceiling offers substantial advantages over open cell. Closed cell foam has a higher r value than open cell foam usually about 6 0 per inch.

But some closed cell foams like tiger foam s e84 closed. 2 10 rafters cathedral ceiling 9 5 inches of space. This is the only way to insulate a cathedral ceiling. The dew point will be in foam it green and thus minimize moisture issues.