Roof Insulation R Value Ontario

A bare concrete wall basement foundation rates at an insulation r value of about r 1.

Roof insulation r value ontario.

All insulation materials in ontario must meet requirements set out by the national government. R value measures how well certain building insulation materials can resist heat. Know exactly how much you need with our project calculators. 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.

For a very good introductory overview article on r value see r values over at the website of. The two distinct types of attic insulation are loose fill material also commonly known as blown in insulation and batting. Add insulation to attic. 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.

The r value of the insulation for every inch of thickness depends on the type of insulation. In such cases where r value is assigned this may decrease the r value requirement for batt insulation. Newly insulated attic rates at an insulation r value of r 40 or more. Ontario building code sb 12 insulation requirement increases so now we need to figure out the most effective use of materials to get to r24 in the exterior walls.

I m figuring that 2x6 with r20 1 r5 insulated sheathing will be cheaper than 2x4 with sprayed urethane r7 per inch r24 5 but will need to be analyzed. 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 recommended r value for attic insulation in ontario is between r 50 and r 60. Existing 3 4 inches of insulation.

Recommended insulation levels for retrofitting existing wood framed buildings. When determining how much insulation you need don t guesstimate calculate. To be available on the market manufacturers take care of this step before their products are even available which is why it s important to ensure you re buying new insulation and not dead stock found in someone s garage. You should of course see the manufacturer provided technical data sheet for the r value of specific products.

See the department of energy s doe ranges for recommended levels of insulation below. 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. Insulation r value is proportional to the insulating material being used.