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.

Foam board insulation r value. Polyiso comes in several thicknesses and is used over house sheathing underneath siding or in attic spaces where its reflective properties are very effective. Fiberglass insulation is less than half the price of rigid foam insulation when calculated by r value per square foot. Polyisocyanurate foam board 1 inch thick. Rmax r matte plus 3 1 2 in.

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. Kingspan insulation r 3 common. It provides an r value of 6 per inch of thickness and often comes foil faced to help reflect radiant heat. For every type and material of insulation check the r value per inch of thickness that the manufacturer has listed.

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. 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 insulation packs a lot of r value into a relatively thin package.

This is the product that i typically use to insulate basement walls. 0 56 in x 4 ft x 8 ft 1 unfaced polystyrene foam board insulation item 511270 model 100000050497. This insulation board is probably one of the most widely used foam board insulation products in the residential construction industry. It is often used as a layer of continuous insulation on exterior walls and in the roof.

0 56 in x 4 ft x 8 ft. 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. A higher insulation r value usually means a higher price point as well. 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.

This is an even more dense and more expensive foam board insulation. 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. There is also less waste with fiberglass insulation. Expanded polystyrene foam board 1 inch thick 3 8 4 4.