Spray Foam Insulation Thickness Attic

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.

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. Image courtesy of d7 spray foam insulation houston tx using spray foam insulation in an unvented attic application. Light density open cell spray foam is commonly known as half pound. The icc es report for insulstar spray foam from ncfi esr 1615 issued february 1 2005 lists a maximum thickness of only 2 inches.

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. 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. 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 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.

Earlier this year i got a question about a home that had spray foam insulation in the attic. 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. Spray foam insulation thickness. Light density open cell spray foam ocspf.

Nothing unusual about that. The recommended maximum thickness varies depending on the manufacturer making the spray foam. 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. 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. 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. The unvented attic space is considered the most effective and up to date building practice particularly by the spray foam industry.

Medium density closed cell spray foam ccspf. In a properly insulated spray foam attic the temperature won t be much higher than the house temperature.