Roof Insulation R Value Ontario

Existing 3 4 inches of insulation.

Roof insulation r value ontario.

R value roofs without attic space insulation above deck u 0 032 r 30 0 ci u 0 028 r 35 0 ci with attic space and other u 0 021 r 50 0 u 0 017 r 60 0 walls above grade above grade walls u 0 055 r 13 0 r 10 0 ci u 0 055 r 13 0 r 10 0 ci wall below grade. Recommended insulation levels for retrofitting existing wood framed buildings. 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. When determining how much insulation you need don t guesstimate calculate.

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. R values of common types of insulation. Here s a handy r value table that covers most types of roof coverings building insulation and a few other materials. A bare concrete wall basement foundation rates at an insulation r value of about r 1.

The recommended r value for attic insulation in ontario is between r 50 and r 60. 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. Know exactly how much you need with our project calculators. Insulation r value is proportional to the insulating material being used.

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. 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. The r value of the insulation for every inch of thickness depends on the type of insulation. 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.

You should of course see the manufacturer provided technical data sheet for the r value of specific products. 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. In such cases where r value is assigned this may decrease the r value requirement for batt insulation.

See the department of energy s doe ranges for recommended levels of insulation below. R value measures how well certain building insulation materials can resist heat. Newly insulated attic rates at an insulation r value of r 40 or more. All insulation materials in ontario must meet requirements set out by the national government.