Spray Foam Insulation Thickness Attic

Light density open cell spray foam is commonly known as half pound.

Spray foam insulation thickness attic.

Both low density open cell and medium density closed cell spray foam can be used in an unvented attic to provide the needed thermal resistance and airtightness. Light density open cell spray foam ocspf. Image courtesy of d7 spray foam insulation houston tx using spray foam insulation in an unvented attic application. A lot of builders and homeowners are going with spray foam insulation because of the airtightness benefits but then the questioner mentioned that the spray foam contractor had intentionally left big holes to the outside by not sealing the gable vents.

The icc es report for insulstar spray foam from ncfi esr 1615 issued february 1 2005 lists a maximum thickness of only 2 inches. Earlier this year i got a question about a home that had spray foam insulation in the attic. Unvented attics sometimes called sealed enclosed or encapsulated attics feature insulation on the underside of the roof decking rather than on the attic floor. This form of insulation is commonly known as two pound foam as it is a rigid insulating material that requires a thickness of 50 mm when applied in the home typically this foam s natural color is yellow when applied in insulation.

Although spray foam insulation has been in use since the 1940s primarily for aircraft for the past 30 years continual product innovation has seen the increased adoption of spray foam insulation in residential and commercial construction. Medium density closed cell spray foam ccspf. Spray foam kits are quicker and easier to use plus you get a seamless air barrier and high r value in just 1 inch. The problem was that the installer was doing his first spray foam job ever and the thickness of the insulation varied from zero visible roof deck to about 9.

The recommended maximum thickness varies depending on the manufacturer making the spray foam. The best part of using foam it green spray foam on an attic floor is you only need 1 inch cured thickness to seal the living spaces you use from the attic. Unfortunately good average thickness doesn t cut it. Nothing unusual about that.

Then you can use other forms of insulation like fiberglass or cellulose to add r value now that you have a tight air seal. Insulstar spray foam insulation is a spray applied semi rigid cellular polyurethane foam plastic insulation having a maximum thickness of 2 inches and a nominal density of 2 0 pcf. In a properly insulated spray foam attic the temperature won t be much higher than the house temperature. The unvented attic space is considered the most effective and up to date building practice particularly by the spray foam industry.

The rapid growth of sprayed foam insulation in building construction thanks in part to its immediate and long term. If you d like to start saving money and time today buy foam it green spray foam insulation now or call us at 800 516 0949.