Foam Board Insulation R Value

For every type and material of insulation check the r value per inch of thickness that the manufacturer has listed.

Foam board insulation r value. 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. This is an even more dense and more expensive foam board insulation. This is the product that i typically use to insulate basement walls.

Rigid foam insulation packs a lot of r value into a relatively thin package. Expanded polystyrene foam board 1 inch thick 3 8 4 4. R values vary depending on many factors including the mean temperature at which the test is conducted and the age of the sample at the time of testing. Polyisocyanurate foam board 1 inch thick.

Kingspan insulation r 3 common. Fiberglass insulation is less than half the price of rigid foam insulation when calculated by r value per square foot. 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. 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.

Used in this way the foam lowers the loss of energy through framing members a phenomenon called thermal bridging and increases the overall r value of the roof or wall assembly. 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. 0 56 in x 4 ft x 8 ft. Xps has an r value of 4 5 to 5 0 per inch of thickness.

There is also less waste with fiberglass insulation. It provides an r value of 6 per inch of thickness and often comes foil faced to help reflect radiant heat. 0 56 in x 4 ft x 8 ft 1 unfaced polystyrene foam board insulation item 511270 model 100000050497. For example insulating a 10 square foot wall area to r 15 costs about 3 40 to 4 00 with fiberglass insulation while a comparable r value for rigid foam costs roughly 10.

It is often used as a layer of continuous insulation on exterior walls and in the roof. Typically a higher insulation r rating means better climate control and better energy efficiency for your home. 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. Polyiso comes in several thicknesses and is used over house sheathing underneath siding or in attic spaces where its reflective properties are very effective.