Open Cell Foam R Value Chart

Expanded polystyrene foam eps is the cheapest and least used foam board product on the market.

Open cell foam r value chart.

Foam insulation densities vary among closed cell vs open cell forms. 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. 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. Closed cell foams are more dense and rigid typically about 2 lb cu.

Two inches of closed cell foam will provide r12 r14 of insulation. This product typically has an r value of 3 6 to 4 0 per inch of thickness. Along with knowing the r value of a particular insulation it is also important to calculate the r value of a total system. The r value is r 3 5 to r 3 6 per inch so filling a 2 4 cavity yields about an r 13.

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. Rmax r matte plus 3 1 2 in. 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.

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. As a benchmark one inch of solid wood has an r value of 1. 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. 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.

Closed cell polystyrene spray foam 1 inch thick 6 5. R value is an important insulation term about measurement. 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. Just like for open cell foam r values are additive.

C or thermal conductance of these materials is the reciprocal of the r value. 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. Closed cell open cell spray foam r values. R value is the only measurement used in building codes today however it is not the only way to stop energy loss.

Open cell polyurethane spray foam 3 5 inches thick 12 6. Closed cell spray foams are between 2 and 4 lbs. Expanded polystyrene foam board.