Roof Insulation Board R Value

Polyiso insulation thickness r value chart.

Roof insulation board r value.

High r value 2 5 r. R3 r18 r21 total roof r value. Understanding r value thursday december 13 2018 what does r value mean. These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation.

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. Extruded polystyrene foam xps also known as blue board or pink board comes in many different thicknesses and edge profiles. Rsi r value système international is the metric equivalent. Johns manville r panel rigid roof insulation board offers r values of up to r 23 6 providing high thermal efficiency.

A higher r value means that the insulation will do a better job of holding in conditioned air whether that s heat in the winter or cool air in the summer. Rigid foam insulation also known as insulating boards provide high r values. R value is used in the united states. You should of course see the manufacturer provided technical data sheet for the r value of specific products.

For a very good introductory overview article on r value see r values over at the website of. 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. Rigid insulation is one of the best tools to reduce your energy costs. Xps has an r value of 4 5 to 5 0 per inch of thickness.

I calculate insulation resistance to heat loss or r percentage improvement always as relative to the original number. Install it anywhere from the roof to the foundation. Protector hd allows easy efficient scoring cutting and snapping which permits fast tight fabrication and all in a low dust environment. For example two inches of extruded polystyrene with an r value of 11 has an rsi of 1.

Commercial roof insulation recommendations zones 1 3 pima recommended r value r 20 zones 4 6 pima recommended r value r 25 zones 7 and 8 pima recommended r value r 30 all of alaska in zone 7 except for the following boroughs in zone 8. Calculate percent improvement in r value. This also means easy hoisting staging and maneuvering around the roof. They keep your home at a comfortable temperature without the need to crank your heat.

With firestone you get one source with everything needed for any roof design. Provides significantly more thermal insulation r value than wood fiber or gypsum boards. To convert the r value of a specific thickness of a material to rsi divide the r value by 5 67826. The increase r21 r3 exactly 18 the value by which you are increasing the r value.

Here s a handy r value table that covers most types of roof coverings building insulation and a few other materials. R value of various materials.