Roof Insulation R Value Canada

You should of course see the manufacturer provided technical data sheet for the r value of specific products.

Roof insulation r value canada.

For a very good introductory overview article on r value see r values over at the website of. The table below shows what levels of insulation are cost effective for different climates and. One method involves installing rigid board insulation on top of the existing roof see figure 5 25. Firestone iso 95 gl polyiso insulation has a higher r value than other insulation products while also outperforming competitive polyiso at low temperature.

R3 r18 r21 total roof 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. If the nominal thermal resistance of the cavity insulation being used falls between two specified rsi r values the lower value must be applied i e rounding up is not permitted. Depending on where you live and the part of your home you re insulating walls crawlspace attic etc you ll need a different r value.

Typical recommendations for exterior walls are r 13 to r 23 while r 30 r 38 and r 49 are common for ceilings and attic spaces. The r value of the insulation for every inch of thickness depends on the type of insulation. Here s a handy r value table that covers most types of roof coverings building insulation and a few other materials. The frame cavity component tables indicate eligible surface air films or roof air spaces that may be included in the continuous layers of rsi series determined in.

The recommended r value for attic insulation in ontario is between r 50 and r 60. Firestone isogard polyiso insulation goes even further and was the first product on the market to meet both astm c1289 required and recommended thermal performance values. In such cases where r value is assigned this may decrease the r value requirement for batt insulation. Calculate percent improvement in r value.

The two distinct types of attic insulation are loose fill material also commonly known as blown in insulation and batting. I calculate insulation resistance to heat loss or r percentage improvement always as relative to the original number. R value is a measure of insulation s ability to resist heat traveling through it. The increase r21 r3 exactly 18 the value by which you are increasing the r value.

The higher the r value the better the thermal performance of the insulation. Foam plastic insulation on the interior of the building envelope must adhere to the requirements of protection of foamed plastics as per 9 10 17 10 of the national building code of canada. R values of common types of insulation. Recommended home insulation r values.

R value of various materials.