Rigid Foam R Value Per Inch

Expanded polystyrene eps extruded polystyrene xps and polyisocyanurate.

Rigid foam r value per inch. R value chart for enerfoil tm rigid foam faced insulation. Expanded polystyrene insulation is similar to the foam used for packing peanuts and it s typically used for insulated concrete forms also knows as icf s. Expanded polystyrene foam eps is the cheapest and least used foam board product on the market. The time of testing.

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. Rmax r matte plus 3 1 2 in. Because rigid foam plastic insulation products are not all aged in accordance with the same standards it is useful to publish comparison r value data. R value is not entirely a function of the thickness of the material as the facing material and type of foam used will affect the r value of the material.

Rigid foam can be used in walls roofs and foundations for retrofits or new construction. Eight inches of poor quality insulation may have a higher and better r value than one inch of top. As a benchmark one inch of solid wood has an r value of 1. 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.

Open cell polyurethane spray foam 3 5 inches thick 12 6. Closed cell polystyrene spray foam 1 inch thick 6 5. Along with knowing the r value of a particular insulation it is also important to calculate the r value of a total system. There are three main types of rigid foam insulation.

Thickness inches r value in i p imperial rsi r value in metric 0 5. For a 1 in thick 4 8 panel comes unfaced or with a number of different plastic facings. Loose fill such as fiberglass cellulose mineral wool 8 23 inches thick 30 50. Additional r value for a masonry wall constructed using these materials needs to add the insulating value of additional wall components typically included such as 1 solid foam polyisocyanurate r 8 extruded polystyrene r 5 expanded polystyrene r 4 or 1 of perlite r 2 7 and for an exterior air film winter no wind r 0 17 an interior.

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. The r value for foamular xps insulation is provided from testing at two mean temperatures 40ºf and 75ºf and from two aging conditioning techniques 180 day real. Rigid foam r values range from r 1 for 1 4 inch thick sheathing panels to r 15 for 3 inch thick panels. Most varieties of foam have a higher r value per inch than fiberglass cotton or cellulose.

This product typically has an r value of 3 6 to 4 0 per inch of thickness. Conditioned per atsm c1289 test method astm c518 1 2.