Roof Insulation R Value Canada

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Roof insulation r value canada.

The r value of the insulation for every inch of thickness depends on the type of insulation. See the department of energy s doe ranges for recommended levels of insulation below. Thickness inches r value in i p imperial rsi r value in metric 0 5. 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.

I calculate insulation resistance to heat loss or r percentage improvement always as relative to the original number. The increase r21 r3 exactly 18 the value by which you are increasing the r value. If installed uncompressed in a 152 mm cavity e g some manufactured framing products it will retain its full thermal resistance value of 3 52 m2 k w. You should of course see the manufacturer provided technical data sheet for the r value of specific products.

Here s a handy r value table that covers most types of roof coverings building insulation and a few other materials. R values of common types of insulation. 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. The higher the r value the greater the insulation performance.

The percentage increase increase increase original number 100. R value of various materials. In such cases where r value is assigned this may decrease the r value requirement for batt insulation. For a very good introductory overview article on r value see r values over at the website of.

When determining how much insulation you need don t guesstimate calculate. One method involves installing rigid board insulation on top of the existing roof see figure 5 25. The higher rsi value of rigid insulation means a smaller increase in the roof thickness although several layers of insulation may be needed to meet the desired rsi level. R3 r18 r21 total roof r value.

The recommended r value for attic insulation in ontario is between r 50 and r 60. R value measures how well certain building insulation materials can resist heat. The two distinct types of attic insulation are loose fill material also commonly known as blown in insulation and batting. R value chart for enerfoil tm rigid foam faced insulation.