Roof Insulation R Value Ontario

The higher the r value the greater the insulation performance.

Roof insulation r value ontario.

Add insulation to attic. 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. All insulation materials in ontario must meet requirements set out by the national government. See the department of energy s doe ranges for recommended levels of insulation below.

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. You should of course see the manufacturer provided technical data sheet for the r value of specific products. The two distinct types of attic insulation are loose fill material also commonly known as blown in insulation and batting.

R value of various materials. The recommended r value for attic insulation in ontario is between r 50 and r 60. 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. The r value of the insulation for every inch of thickness depends on the type of insulation.

Newly insulated attic rates at an insulation r value of r 40 or more. Insulation r value is proportional to the insulating material being used. For a very good introductory overview article on r value see r values over at the website of. 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.

When determining how much insulation you need don t guesstimate calculate. Existing 3 4 inches of insulation. Recommended insulation levels for retrofitting existing wood framed buildings. R values of common types of insulation.

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. 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. In such cases where r value is assigned this may decrease the r value requirement for batt insulation.