Rigid Foam R Value Per Inch

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 r value per inch. Expanded polystyrene eps extruded polystyrene xps and polyisocyanurate. This product typically has an r value of 3 6 to 4 0 per inch of thickness. 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. As a benchmark one inch of solid wood has an r value of 1.

Falls in the middle of the three types of rigid foam insulation in both cost and r value used most in walls or below grade applications recyclable and at about r 5 per inch costs around 42 per sq. Most varieties of foam have a higher r value per inch than fiberglass cotton or cellulose. Rigid foam can be used in walls roofs and foundations for retrofits or new construction. For a 1 in thick 4 8 panel comes unfaced or with a number of different plastic facings.

Expanded polystyrene foam eps is the cheapest and least used foam board product on the market. Closed cell polystyrene spray foam 1 inch thick 6 5. R value chart for enerfoil tm rigid foam faced insulation. Along with knowing the r value of a particular insulation it is also important to calculate the r value of a total system.

Rmax r matte plus 3 1 2 in. Fiberglass insulation packs in more r value per cubic inch than rigid foam insulation does. Open cell polyurethane spray foam 3 5 inches thick 12 6. Conditioned per atsm c1289 test method astm c518 1 2.

There are three main types of rigid foam insulation. 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. Eight inches of poor quality insulation may have a higher and better r value than one inch of top. The time of testing.

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. 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. 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. Rigid foam r values range from r 1 for 1 4 inch thick sheathing panels to r 15 for 3 inch thick panels.

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. Thickness inches r value in i p imperial rsi r value in metric 0 5.