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.

Rigid roof insulation r value.

Rigid insulation is one of the best tools to reduce your energy costs. The increase r21 r3 exactly 18 the value by which you are increasing the r value. R panel is manufactured with a closed cell polyisocyanurate foam core bonded to fiberglass reinforced facers and designed for use over metal nailable and non nailable roof decks with a variety of membrane systems. Calculate percent improvement in r value.

Rigid insulation is usually made up of fibrous materials or plastic foams. Install it anywhere from the roof to the foundation. Rigid foam insulation also known as insulating boards provide high r values. These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation.

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. R3 r18 r21 total roof r value. 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.

All products in the acfoam polyiso roof insulation family are closed cell rigid foam insulation board flat or tapered. As foam ages over time air and blowing agents diffuse in and out of the foam structure resulting in reduced r value. You can even place it under the foundation slab. With premium polyiso manufacturing atlas is able to produce the highest effective r values with minimal material thickness.

Owens corning insulation products help improve thermal performance and control moisture in commercial institutional and. The r value is a measurement of the heat loss and heat gain. 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. Rigid polyisocyanurate thermal insulation board.

Depending on the type of insulation you choose and the desired r value you want for your facility you may need to build up a few layers of insulation. Johns manville r panel rigid roof insulation board offers r values of up to r 23 6 providing high thermal efficiency. I calculate insulation resistance to heat loss or r percentage improvement always as relative to the original number. As part of that standard the products must meet r value requirements presented as long term thermal resistance lttr.

When it comes to insulation performance the difference is in the details.