Spray Foam Roof Insulation Thickness

A 3 in thick layer of open cell spray foam has a permeance grade of 16.

Spray foam roof insulation thickness.

The 1 question to ask before putting spray foam in your attic. I ve been in plenty of these homes and can tell you that when spray foam is installed properly they outperform 99 of fiberglass batt insulated stick built homes. Spray foam kits are quicker and easier to use plus you get a seamless air barrier and high r value in just 1 inch. 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.

But spray foam insulation used at the underside of the roof deck would need to be covered by a thermal barrier and intumescent coatings are commonly used. Open cell spray foam has a low density which makes it vapor permeable. I can also tell you that 73 of all statistics are made up on the spot so please don t ask for. Spray foam insulation comes in two types open cell and closed cell.

Open cell spray foam is a perfectly acceptable insulation product to use in attics. You ll find it used for ceilings walls and roofs. The rapid growth of sprayed foam insulation in building construction thanks in part to its immediate and long term. Homes insulated with it can be some of the most efficient and comfortable homes built.

You may be wondering spray foam roofs get spray applied meaning they can be a inch 2 inches or 10 inches or really any thickness a spray foam applicator feels like doing. Open cell spray foam 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. Beware of roofers in homes with spray foam insulation.

Spray foam insulation is a great product. The movement of air into indirect conditioning of an unvented attic is a slow gradual process that will not be noticeable by occupants and typically will not put any strain on the hvac system. Do it right and your roof will not rot. Ultimately the spray foam insulation cost will be predominately influenced by the type of spray foam insulation you need the thickness and area that you want to insulate.

There you have it. I don t want the costs of applying additional foam to outweigh the benefits it will provide. Does your spray foam insulation need a thermal or ignition barrier. What s the recommended thickness of a spray foam roof.

The icc es report for insulstar spray foam from ncfi esr 1615 issued february 1 2005 lists a maximum thickness of only 2 inches. 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. Most low slope roof construction using spray foam use a hybrid approach where a combination of high density closed cell spray foam is used with fiberglass or cellulose insulation. But what thickness is most beneficial to my roof.