Roof Insulation Board R Value

Extruded polystyrene foam xps also known as blue board or pink board comes in many different thicknesses and edge profiles.

Roof insulation board r value.

For a very good introductory overview article on r value see r values over at the website of. Xps has an r value of 4 5 to 5 0 per inch of thickness. 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. Protector hd allows easy efficient scoring cutting and snapping which permits fast tight fabrication and all in a low dust environment.

This also means easy hoisting staging and maneuvering around the roof. Johns manville r panel rigid roof insulation board offers r values of up to r 23 6 providing high thermal efficiency. To convert the r value of a specific thickness of a material to rsi divide the r value by 5 67826. Understanding r value thursday december 13 2018 what does r value mean.

R3 r18 r21 total roof r value. Rigid insulation is one of the best tools to reduce your energy costs. To convert rsi to r value multiply the rsi by 5 67826. R value is used in the united states.

Provides significantly more thermal insulation r value than wood fiber or gypsum boards. You can even place it under the foundation slab. For example two inches of extruded polystyrene with an r value of 11 has an rsi of 1. 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.

Polyiso insulation thickness r value chart. 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. This insulation board is probably one of the most widely used foam board insulation products in the residential construction industry. Rsi r value système international is the metric equivalent.

I calculate insulation resistance to heat loss or r percentage improvement always as relative to the original number. They keep your home at a comfortable temperature without the need to crank your heat. Rigid foam insulation also known as insulating boards provide high r values. High r value 2 5 r.

Install it anywhere from the roof to the foundation. You should of course see the manufacturer provided technical data sheet for the r value of specific products. R value of various materials. Calculate percent improvement in r value.

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