Roof Insulation R Value Canada

See the department of energy s doe ranges for recommended levels of insulation below.

Roof insulation r value 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 such cases where r value is assigned this may decrease the r value requirement for batt insulation. R3 r18 r21 total roof r value. The increase r21 r3 exactly 18 the value by which you are increasing the r value.

The r value of the insulation for every inch of thickness depends on the type of insulation. R value of various materials. Conditioned per atsm c1289 test method astm c5181 2. The recommended r value for attic insulation in ontario is between r 50 and r 60.

You should of course see the manufacturer provided technical data sheet for the r value of specific products. 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 percentage increase increase increase original number 100. 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.

For a very good introductory overview article on r value see r values over at the website of. 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. R value measures how well certain building insulation materials can resist heat. Here s a handy r value table that covers most types of roof coverings building insulation and a few other materials.

When determining how much insulation you need don t guesstimate calculate. R value chart for enerfoil tm rigid foam faced insulation. Know exactly how much you need with our project calculators. One method involves installing rigid board insulation on top of the existing roof see figure 5 25.

Thickness inches r value in i p imperial rsi r value in metric 0 5. R values of common types of insulation. The higher the r value the greater the insulation performance. The two distinct types of attic insulation are loose fill material also commonly known as blown in insulation and batting.