Open Cell Vs Closed Cell Foam Insulation Attic

Open cell foam insulation in my attic area.

Open cell vs closed cell foam insulation attic.

Closed cell foam can be over three times that with a density of 1 75 pounds per cubic foot or more. Closed cell insulation is completely waterproof and is not affected by water in any way. Most open cell foam has a density of about 5 pounds per cubic foot. Closed cell foam is much denser than open cell foam.

Not long ago someone even told me that in florida roofing companies won t let their workers go up on roofs with open cell spray foam because the roofs are so spongy the guys fall right through. Open cell foam is used in a wide range of applications such as for noise reduction in sound rooms home insulation metal buildings under roof deck for semi conditioned attics and more. I am getting mixed advice about closed cell vs. Closed cell foam can also increase the racking.

It rots roofs people have told me. Murmurs and hearsay about open cell spray foam insulation have been gaining traction for a while. Insulating value and strength open cell foam has an r value of about 3 5 to 3 7 per inch while closed cell foam has an r value of about 6 per inch. When applied on the interior open cell spray insulation provides performance advantages that differ from those of closed cell spray foam used on the exterior.

Architectural firms can specify both the building envelope for a total performance option. There are two types of spray foam insulation open cell and closed cell. Closed cell spray foam exterior applications. An overview of closed cell spray foam insulation closed cell spray foam insulation is highly efficient.

Open cell spray foam costs between 0 25 to 0 50 per board foot and closed cell spray foam ranges from 0 90 to 1 50 per board foot. Some say use open that way you can see a leak before it does any damage others say use closed so any water damage should run off under your roof shingles.