2 Rigid Roof Insulation R Value

Important for people living in the north such as minnesota is that the r value at 0 degrees f is 4 55.

2 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. The r value goes up as the temperature drops. 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. Rigid foam insulation packs a lot of r value into a thin package but not all rigid foam performs the same.

Rigid insulation is usually made up of fibrous materials or plastic foams. Excellent lttr value compared to any other fm class 1 rated products of equivalent thickness. 1 when joints penetrations detailed appropriately. 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.

Install it anywhere from the roof to the foundation. Rigid insulation is one of the best tools to reduce your energy costs. They keep your home at a comfortable temperature without the need to crank your heat. As part of that standard the products must meet r value requirements presented as long term thermal resistance lttr.

You can even place it under the foundation slab. 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. 2 the exact opposite is true for polyiso. 1 per bsaf 1 cu ft.

The lttr test is a technically supported more. Rigid foam insulation also known as insulating boards provide high r values. See also material data sheet msds 1511 or msds 1911. 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.

Rigid polyisocyanurate thermal insulation board. Eps has an r value of 3 85 at 75 degrees f. 1 844 446 7858 my account. 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 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. Also it is much more expensive. 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.