Spray Foam Insulation Thickness Attic

The icc es report for insulstar spray foam from ncfi esr 1615 issued february 1 2005 lists a maximum thickness of only 2 inches.

Spray foam insulation thickness 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. The recommended maximum thickness varies depending on the manufacturer making the spray foam. 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. 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.

Nothing unusual about that. Spray foam insulation thickness. Spray foam kits are quicker and easier to use plus you get a seamless air barrier and high r value in just 1 inch. Light density open cell spray foam is commonly known as half pound.

The unvented attic space is considered the most effective and up to date building practice particularly by the spray foam industry. 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. Image courtesy of d7 spray foam insulation houston tx using spray foam insulation in an unvented attic application. Medium density closed cell spray foam ccspf.

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. 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. Most spray foam is limited to a thickness of 5 5 giving it an r value of 20 but in the more northern areas of the country where the r value is recommended to be at least 30 spray foam is not enough insulation. 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. Then you can use other forms of insulation like fiberglass or cellulose to add r value now that you have a tight air seal. In a properly insulated spray foam attic the temperature won t be much higher than the house temperature. Light density open cell spray foam ocspf.

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. 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.