Roof Insulation Board R Value

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.

Roof insulation board r value.

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. Rsi r value système international is the metric equivalent. The increase r21 r3 exactly 18 the value by which you are increasing the r value. Rigid foam insulation also known as insulating boards provide high r values.

Polyiso insulation thickness r value chart. 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. High r value 2 5 r. This also means easy hoisting staging and maneuvering around the roof.

R3 r18 r21 total roof r value. With firestone you get one source with everything needed for any roof design. They keep your home at a comfortable temperature without the need to crank your heat. This insulation board is probably one of the most widely used foam board insulation products in the residential construction industry.

Calculate percent improvement in r value. Xps has an r value of 4 5 to 5 0 per inch of thickness. You should of course see the manufacturer provided technical data sheet for the r value of specific products. I calculate insulation resistance to heat loss or r percentage improvement always as relative to the original number.

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. Provides significantly more thermal insulation r value than wood fiber or gypsum boards. These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation.

Here s a handy r value table that covers most types of roof coverings building insulation and a few other materials. R value is used in the united states. R value of various materials. To convert the r value of a specific thickness of a material to rsi divide the r value by 5 67826.

For a very good introductory overview article on r value see r values over at the website of. Extruded polystyrene foam xps also known as blue board or pink board comes in many different thicknesses and edge profiles. For example two inches of extruded polystyrene with an r value of 11 has an rsi of 1. Rigid insulation is one of the best tools to reduce your energy costs.

Install it anywhere from the roof to the foundation. To convert rsi to r value multiply the rsi by 5 67826.