Open Cell Foam R Value Chart

Expanded polystyrene foam board.

Open cell foam r value chart.

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. Just like for open cell foam r values are additive. R value is an important insulation term about measurement. 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.

Closed cell spray foams are between 2 and 4 lbs. Two inches of closed cell foam will provide r12 r14 of insulation. 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. Along with knowing the r value of a particular insulation it is also important to calculate the r value of a total system.

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. This product typically has an r value of 3 6 to 4 0 per inch of thickness. As a benchmark one inch of solid wood has an r value of 1. Expanded polystyrene foam eps is the cheapest and least used foam board product on the market.

Open cell foams are typically about 1 2 lb cubic foot. 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. Closed cell polystyrene spray foam 1 inch thick 6 5. 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.

Rmax r matte plus 3 1 2 in. 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. 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 foams are more dense and rigid typically about 2 lb cu.

The r value is r 3 5 to r 3 6 per inch so filling a 2 4 cavity yields about an r 13. Closed cell open cell spray foam r values. It measures the effectiveness at stopping energy loss by way of conduction one of the 3 forms of energy transfer. Open cell polyurethane spray foam 3 5 inches thick 12 6.

R value is the only measurement used in building codes today however it is not the only way to stop energy loss. Foam insulation densities vary among closed cell vs open cell forms. C or thermal conductance of these materials is the reciprocal of the r value.