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.

Roof insulation board r value.

The increase r21 r3 exactly 18 the value by which you are increasing the 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. Here s a handy r value table that covers most types of roof coverings building insulation and a few other materials. For a very good introductory overview article on r value see r values over at the website of.

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. Xps has an r value of 4 5 to 5 0 per inch of thickness. They keep your home at a comfortable temperature without the need to crank your heat.

Understanding r value thursday december 13 2018 what does r value mean. Install it anywhere from the roof to the foundation. Rigid insulation is one of the best tools to reduce your energy costs. I calculate insulation resistance to heat loss or r percentage improvement always as relative to the original number.

To convert rsi to r value multiply the rsi by 5 67826. Polyiso insulation thickness r value chart. These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation. Calculate percent improvement in r value.

You should of course see the manufacturer provided technical data sheet for the r value of specific products. Rsi r value système international is the metric equivalent. R3 r18 r21 total roof r value. With firestone you get one source with everything needed for any roof design.

High r value 2 5 r. Johns manville r panel rigid roof insulation board offers r values of up to r 23 6 providing high thermal efficiency. Rigid foam insulation also known as insulating boards provide high r values. 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.

This insulation board is probably one of the most widely used foam board insulation products in the residential construction industry. To convert the r value of a specific thickness of a material to rsi divide the r value by 5 67826. You can even place it under the foundation slab. R value is used in the united states.

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.