Rigid Roof Insulation R Value

Rigid foam insulation packs a lot of r value into a thin package but not all rigid foam performs the same.

Rigid roof 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. When it comes to insulation performance the difference is in the details. Rigid insulation is usually made up of fibrous materials or plastic foams. Foamular xps roof insulation for commercial buildings page 5 foamular xps roof insulation for commercial buildings foamular xps insulation is a rigid foam insulation which meets the needs of today s design professionals for a truly sustainable insulation product.

Owens corning insulation products help improve thermal performance and control moisture in commercial institutional and. 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. With premium polyiso manufacturing atlas is able to produce the highest effective r values with minimal material thickness. Firestone iso 95 gl polyiso insulation has a higher r value than other insulation products while also outperforming competitive polyiso at low temperature.

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. 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 example if you have a type of insulation that has an r value of r 5 per inch of thickness you will need a depth of 6 inches of this insulation installed in your attic to reach r 30 if you live in zones 2 or 3. Choose rigid insulation wisely and consider the effect its characteristics will have on the performance of the your project overall product cost and the best way to get the bang for your buck.

I calculate insulation resistance to heat loss or r percentage improvement always as relative to the original number. After the roof deck is ready the rigid foam insulation is installed. Firestone isogard polyiso insulation goes even further and was the first product on the market to meet both astm c1289 required and recommended thermal performance values. Rigid polyisocyanurate thermal insulation board.

R3 r18 r21 total roof r value. The increase r21 r3 exactly 18 the value by which you are increasing the r value. As part of that standard the products must meet r value requirements presented as long term thermal resistance lttr. As foam ages over time air and blowing agents diffuse in and out of the foam structure resulting in reduced r value.

These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation. All products in the acfoam polyiso roof insulation family are closed cell rigid foam insulation board flat or tapered. Rmax r matte plus 3 1 2 in.