Spray Foam Insulation

Types of Spray Foam Polyurethane Insulation


There are two types of spray foam polyurethane insulation: open cell and closed cell.

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Open Cell Foam. Open cell spray polyurethane foam (also sometimes referred to as low-density or 1/2-pound SPF) weighs between 0.4 and 0.6 pounds/cubic foot when fully cured. It is spray applied to a substrate and typically, expands about 150 times its original volume to form a semi-rigid/flexible, non-structural plastic insulation. R-value is 3.4-3.8/inch.  Open cell SPF typically employs water as a blowing agent, and is spray-applied to the desired thickness with one pass; any excess can be easily trimmed with a saw, knife or plane.


Open Cell Foam
Closed Cell Foam.  Closed cell polyurethane foam used in interior applications (also sometimes referred to as mid-density or two-pound SPF) typically weighs between 1.8 and 3 pounds/cubic foot when fully cured. It is also spray applied to a substrate and expands about 35 to 50 times its original volume to form a rigid plastic insulation with a compressive strength of between 15 and 25 psi.  Closed cell SPF can be used to enhance the racking strength of most wall and ceiling assemblies.  The average aged R-value of closed cell SPF is around 6.0/inch.


Closed Cell Foam

1 lb spray foam  is 50% closed cell structure with an r value of 4.9 per inch this foam is a mix between open and closed cell foam but is considered an open cell structure. Their is a lot of company's that promote this as a closed cell but that is false.  Since this is only 50% closed cell structure it needs to be 90% closed cell to be considered a true closed cell by the industry.  www.greeninsulationtechnologies.com

3 lb and 6 lb closed cell foam has and R-value of 6.5 per inch.  3lb foam is used in agricultural, commercial and industrial building and structures for roofs and places where you need a heavier density foam like turkey building, hog building, roofs and grain bins. The 6lb can be sprayed as thin as 1/4 inch for air sealing to help ventilation systems in building work better.


Benefits of Spray Polyurethane Foam Insulation


Both types of SPF insulation offer several key advantages over other forms of building insulation.

In addition to the advantages they share, closed cell foam and open cell foam offer their own specific benefits compared to alternate forms of building insulation.


Benefits of Open Cell SPF


Benefits of Closed Cell SPF

CertainTeed Limited Lifetime Warranty

CertaSpray™ Open Cell Foam


CertaSpray™ Closed Cell Foam 

Green Insulation Technologies - Developer and Manufacturer of Soy and Castor Based Spray Foam Insulation