Rigid Roof Insulation R Value

With premium polyiso manufacturing atlas is able to produce the highest effective r values with minimal material thickness.

Rigid roof insulation r value.

Rigid foam insulation also known as insulating boards provide high r values. You can even place it under the foundation slab. R3 r18 r21 total roof r value. Rigid insulation is usually made up of fibrous materials or plastic foams.

Owens corning insulation products help improve thermal performance and control moisture in commercial institutional and. 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. 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. When it comes to insulation performance the difference is in the details.

Calculate percent improvement in r value. Install it anywhere from the roof to the foundation. Johns manville r panel rigid roof insulation board offers r values of up to r 23 6 providing high thermal efficiency. Rigid insulation is one of the best tools to reduce your energy costs.

After the roof deck is ready the rigid foam insulation is installed. As foam ages over time air and blowing agents diffuse in and out of the foam structure resulting in reduced 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 foam insulation packs a lot of r value into a thin package but not all rigid foam performs the same.

The increase r21 r3 exactly 18 the value by which you are increasing the 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. 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. 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.

All products in the acfoam polyiso roof insulation family are closed cell rigid foam insulation board flat or tapered. Rigid polyisocyanurate thermal insulation board. 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. 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.

I calculate insulation resistance to heat loss or r percentage improvement always as relative to the original number.