Roof Insulation Board R Value

Install it anywhere from the roof to the foundation.

Roof insulation board r value.

Rsi r value système international is the metric equivalent. This insulation board is probably one of the most widely used foam board insulation products in the residential construction industry. R3 r18 r21 total roof r value. Xps has an r value of 4 5 to 5 0 per inch of thickness.

For example two inches of extruded polystyrene with an r value of 11 has an rsi of 1. Calculate percent improvement in r value. Rigid insulation is one of the best tools to reduce your energy costs. Extruded polystyrene foam xps also known as blue board or pink board comes in many different thicknesses and edge profiles.

I calculate insulation resistance to heat loss or r percentage improvement always as relative to the original number. Here s a handy r value table that covers most types of roof coverings building insulation and a few other materials. These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation. R value is used in the united states.

To convert the r value of a specific thickness of a material to rsi divide the r value by 5 67826. 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. For a very good introductory overview article on r value see r values over at the website of. Provides significantly more thermal insulation r value than wood fiber or gypsum boards.

You can even place it under the foundation slab. Rigid foam insulation also known as insulating boards provide high r values. Protector hd allows easy efficient scoring cutting and snapping which permits fast tight fabrication and all in a low dust environment. Understanding r value thursday december 13 2018 what does r value mean.

To convert rsi to r value multiply the rsi by 5 67826. With firestone you get one source with everything needed for any roof design. You should of course see the manufacturer provided technical data sheet for the r value of specific products. High r value 2 5 r.

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. 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. Polyiso insulation thickness r value chart. 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.

R value of various materials. This also means easy hoisting staging and maneuvering around the roof.