2 Rigid Roof Insulation R Value

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2 rigid roof insulation r value. You can even place it under the foundation slab. 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. They keep your home at a comfortable temperature without the need to crank your heat. Rigid insulation is one of the best tools to reduce your energy costs.

The information on this page is based on data considered to be true and accurate based on periodic internal. Install it anywhere from the roof to the foundation. 1 per bsaf 1 cu ft. As part of that standard the products must meet r value requirements presented as long term thermal resistance lttr.

Excellent lttr value compared to any other fm class 1 rated products of equivalent thickness. Rigid foam insulation also known as insulating boards provide high r values. 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. As foam ages over time air and blowing agents diffuse in and out of the foam structure resulting in reduced r value.

Important for people living in the north such as minnesota is that the r value at 0 degrees f is 4 55. See also material data sheet msds 1511 or msds 1911. Also it is much more expensive. 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.

Traditional loose fill insulation such as fiberglass or cellulose has an r value between r 2 0 and 3 5 per inch of thickness. These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation. 2 stated thermal resistance values are based upon conditioning requirements and test methodology found in astm c1289 and astm c518 for foil faced polyisocyanurate insulation. 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 polyisocyanurate thermal insulation board. Rigid foam insulation packs a lot of r value into a thin package but not all rigid foam performs the same. The r value goes up as the temperature drops. Eps has an r value of 3 85 at 75 degrees f.

Rigid insulation is usually made up of fibrous materials or plastic foams. 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. Fm approved subject to the conditions of approval as a roof insulation when installed as shown in the current edition of the factory mutual research approvals guide.