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.

Rigid foam r value per inch.

Thickness inches r value in i p imperial rsi r value in metric 0 5. There are three main types of rigid foam insulation. Open cell polyurethane spray foam 3 5 inches thick 12 6. Loose fill such as fiberglass cellulose mineral wool 8 23 inches thick 30 50.

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. 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. 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. R value chart for enerfoil tm rigid foam faced insulation.

Rmax r matte plus 3 1 2 in. 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. Closed cell polystyrene spray foam 1 inch thick 6 5.

Expanded polystyrene eps extruded polystyrene xps and polyisocyanurate. R value cost sq. Along with knowing the r value of a particular insulation it is also important to calculate the r value of a total system. Conditioned per atsm c1289 test method astm c518 1 2.

As a benchmark one inch of solid wood has an r value of 1. 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. Expanded polystyrene foam eps is the cheapest and least used foam board product on the market.

This product typically has an r value of 3 6 to 4 0 per inch of thickness. For a 1 in thick 4 8 panel comes unfaced or with a number of different plastic facings. 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. Fiberglass insulation packs in more r value per cubic inch than rigid foam insulation does.

The time of testing. 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.