3 Inch Rigid Foam Insulation R Value

Polyisocyanurate foam board 1 inch thick.

3 inch rigid foam insulation r value.

Traditional loose fill insulation such as fiberglass or cellulose has an r value between r 2 0 and 3 5 per inch of thickness. Along with knowing the r value of a particular insulation it is also important to calculate the r value of a total system. Let s use the r value of iko s polyiso insulation enerfoil tm as an example. 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.

For a 1 in thick 4 8 panel comes unfaced or with a number of different plastic facings. Rigid insulation r value by comparison usually ranges from r 4 0 to 6 5 and may get as high as r 8 7 depending on the insulation material. Expanded polystyrene foam board 1 inch thick 3 8 4 4. R value 5 per inch of product thickness and exceptional moisture resistance.

Most insulation manufacturers will first list their insulation s r value for a one inch sample then they ll give you a chart demonstrating the other r values you can achieve if you install a thicker version of their product. 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. 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. Kingspan insulation r 3 common.

Rigid insulation is usually made up of fibrous materials or plastic foams. Products provide superior insulating properties. 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. 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.

Rmax r matte plus 3 1 2 in. This product typically has an r value of 3 6 to 4 0 per inch of thickness. 0 56 in x 4 ft x 8 ft. 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.

As a benchmark one inch of solid wood has an r value of 1. 0 56 in x 4 ft x 8 ft 1 unfaced polystyrene foam board insulation item 511270 model 100000050497.