Open Cell Foam R Value Chart

Open cell spray foam has an r value of about r 3 7 per inch while closed cell spray foam has an r value that may be as high as r 6 5 per inch.

Open cell foam r value chart.

R value is the only measurement used in building codes today however it is not the only way to stop energy loss. Closed cell spray foams are between 2 and 4 lbs. Closed cell open cell spray foam r values. Along with knowing the r value of a particular insulation it is also important to calculate the r value of a total system.

C or thermal conductance of these materials is the reciprocal of the r value. Rmax r matte plus 3 1 2 in. The r value is r 3 5 to r 3 6 per inch so filling a 2 4 cavity yields about an r 13. If you want to install spray foam in a stud wall and price is no object then it would seem to make sense to specify closed cell spray foam right.

Closed cell polystyrene spray foam 1 inch thick 6 5. When applied on the interior open cell spray insulation provides performance advantages that differ from those of closed cell spray foam used on the exterior. In comparison an inch of blown fiberglass insulation has an r value of 3 1 3 4 and an inch of blown cellulose in an attic has an r value of 3 2 3 7. Closed cell foams are more dense and rigid typically about 2 lb cu.

Foam insulation densities vary among closed cell vs open cell forms. R value is an important insulation term about measurement. It s made of environmentally sound closed cell polyisocyanurate foam bonded to a durable white matte non glare aluminum facer and a reflective reinforced aluminum facer. Open cell foams are typically about 1 2 lb cubic foot.

I also recommend you read a recent article about open cell vs closed cell foam products to understand the differences between the two product types. Just like for open cell foam r values are additive. It measures the effectiveness at stopping energy loss by way of conduction one of the 3 forms of energy transfer. Our r value guide to rigid insulation includes the doe s recommended insulation by zone chart r value calculator and base building material r values chart.

Both closed cell spray foam and open cell spray foam insulation can be used effectively in commercial building designs to allow the building to achieve energy efficiency and consistent performance. Closed cell spray foam insulation closed cell spray foam has a far better r value per inch than other less effective insulations like cellulose fiberglass or even open cell foam. Expanded polystyrene foam board. Open cell polyurethane spray foam 3 5 inches thick 12 6.

Two inches of closed cell foam will provide r12 r14 of insulation. Expanded polystyrene foam eps is the cheapest and least used foam board product on the market. R 3 2 polyisocyanurate rigid foam insulation board r matte plus 3 thermasheath 3 is rigid foam r matte plus 3 thermasheath 3 is rigid foam plastic thermal insulation board.