Attic Insulation R Value Chart Canada

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. In comparison an inch of blown fiberglass insulation has an r value of 3 1 3 4 and an inch of blown cellulose in an attic has an r value of 3 2 3 7. The amount of insulation recommended for your home will vary depending on a number of factors.

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As a benchmark one inch of solid wood has an r value of 1.

Attic insulation r value chart canada.

R value is a measure of insulation s ability to resist heat traveling through it. How much insulation should you install. Where you live different climates require different insulation r values. Along with knowing the r value of a particular insulation it is also important to calculate the r value of a total system.

Recommended home insulation r values. Insulation level are specified by r value. The higher the r value the better the thermal performance of the insulation. In such cases where r value is assigned this may decrease the r value requirement for batt insulation.

Note from this chart that the ideal r value differs for each part of your home. In general to optimally isolate an attic on average an r value of the insulation is required ranging from r 50 to r 60. You will need a higher r value of insulation if you live in the northeast than if you live in southern. The insulation levels of an attic or of any part of a house are understood through the r value that is the value with which the insulating material is resistant to heat flow.

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 your attic to reach r 30 if you live in zones 2 or 3. The table below shows what levels of insulation are cost effective for different climates and. Chart courtesy of energy star.

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