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Rigid foam r value per inch. Eight inches of poor quality insulation may have a higher and better r value than one inch of top. Open cell polyurethane spray foam 3 5 inches thick 12 6. 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. Rmax r matte plus 3 1 2 in.
R value chart for enerfoil tm rigid foam faced insulation. Rigid foam r values range from r 1 for 1 4 inch thick sheathing panels to r 15 for 3 inch thick panels. 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. As a benchmark one inch of solid wood has an r value of 1.
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. 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. There are three main types of rigid foam insulation. Conditioned per atsm c1289 test method astm c518 1 2.
Most varieties of foam have a higher r value per inch than fiberglass cotton or cellulose. For a 1 in thick 4 8 panel comes unfaced or with a number of different plastic facings. R value cost sq. 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.
Rigid foam can be used in walls roofs and foundations for retrofits or new construction. Closed cell polystyrene spray foam 1 inch thick 6 5. Expanded polystyrene foam eps is the cheapest and least used foam board product on the market. Along with knowing the r value of a particular insulation it is also important to calculate the r value of a total system.
The time of testing. This product typically has an r value of 3 6 to 4 0 per inch of thickness. Thickness inches r value in i p imperial rsi r value in metric 0 5. 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.
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. 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.
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