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Recommended r value for attic insulation canada the recommended r value for insulation of attics in canada depends on the area as it is a value that changes a lot from area to area.
Recommended attic insulation r value canada. The higher the r value the better the thermal performance of the insulation. Your home s r value score will guide you toward the type of insulation you need. Insulation level are specified by r value. The table below shows what levels of insulation are cost effective for different climates and.
Inspecting your attic insulation. The province the city and the area greatly influence the difference in r value for the insulation of an attic. R value is a measure of insulation s ability to resist heat traveling through it. In general an attic s r value should be between r 30 and r 49.
In such cases where r value is assigned this may decrease the r value requirement for batt insulation. First things first you need to go up into your attic inspect the condition of the insulation and calculate the current level of 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. Find your zone on the map and then use the above insulation r value chart to determine the level of insulation you need to properly insulate your attic walls floors and crawlspaces.
In particularly cold climates you might go up to r 60.
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