2 Rigid Roof Insulation R Value

2 the exact opposite is true for polyiso.

2 rigid roof insulation 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. You can even place it under the foundation slab. The lttr test is a technically supported more. 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.

Rigid insulation is usually made up of fibrous materials or plastic foams. The r value goes up as the temperature drops. Traditional loose fill insulation such as fiberglass or cellulose has an r value between r 2 0 and 3 5 per inch of thickness. Install it anywhere from the roof to the foundation.

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. 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. 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. Rigid polyisocyanurate thermal insulation board.

Rigid foam insulation also known as insulating boards provide high r values. Also it is much more expensive. As part of that standard the products must meet r value requirements presented as long term thermal resistance lttr. 1 when joints penetrations detailed appropriately.

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 is one of the best tools to reduce your energy costs. As foam ages over time air and blowing agents diffuse in and out of the foam structure resulting in reduced r value. 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.

The information on this page is based on data considered to be true and accurate based on periodic internal. Important for people living in the north such as minnesota is that the r value at 0 degrees f is 4 55. 1 per bsaf 1 cu ft. They keep your home at a comfortable temperature without the need to crank your heat.

Rigid foam insulation packs a lot of r value into a thin package but not all rigid foam performs the same. See also material data sheet msds 1511 or msds 1911. Excellent lttr value compared to any other fm class 1 rated products of equivalent thickness.