Roof Insulation Board R Value

Rigid insulation is one of the best tools to reduce your energy costs.

Roof insulation board r value.

Johns manville r panel rigid roof insulation board offers r values of up to r 23 6 providing high thermal efficiency. You can even place it under the foundation slab. Provides significantly more thermal insulation r value than wood fiber or gypsum boards. Calculate percent improvement in r value.

With firestone you get one source with everything needed for any roof design. This also means easy hoisting staging and maneuvering around the roof. To convert the r value of a specific thickness of a material to rsi divide the r value by 5 67826. You should of course see the manufacturer provided technical data sheet for the r value of specific products.

R value is used in the united states. I calculate insulation resistance to heat loss or r percentage improvement always as relative to the original number. Polyiso insulation thickness r value chart. Here s a handy r value table that covers most types of roof coverings building insulation and a few other materials.

High r value 2 5 r. Protector hd allows easy efficient scoring cutting and snapping which permits fast tight fabrication and all in a low dust environment. 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. Xps has an r value of 4 5 to 5 0 per inch of thickness.

Understanding r value thursday december 13 2018 what does r value mean. 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. For example two inches of extruded polystyrene with an r value of 11 has an rsi of 1. Rsi r value système international is the metric equivalent.

To convert rsi to r value multiply the rsi by 5 67826. These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation. This insulation board is probably one of the most widely used foam board insulation products in the residential construction industry. 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.

Extruded polystyrene foam xps also known as blue board or pink board comes in many different thicknesses and edge profiles. Rigid foam insulation also known as insulating boards provide high r values. They keep your home at a comfortable temperature without the need to crank your heat. R3 r18 r21 total roof r value.

For a very good introductory overview article on r value see r values over at the website of. The increase r21 r3 exactly 18 the value by which you are increasing the r value.