Roof Insulation R Value Ontario

R value measures how well certain building insulation materials can resist heat.

Roof insulation r value ontario.

You should of course see the manufacturer provided technical data sheet for the r value of specific products. Existing 3 4 inches of insulation. 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 higher the r value the greater the insulation performance.

Recommended insulation levels for retrofitting existing wood framed buildings. Newly insulated attic rates at an insulation r value of r 40 or more. The two distinct types of attic insulation are loose fill material also commonly known as blown in insulation and batting. When determining how much insulation you need don t guesstimate calculate.

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. The recommended r value for attic insulation in ontario is between r 50 and r 60. Know exactly how much you need with our project calculators.

All insulation materials in ontario must meet requirements set out by the national government. R value of various materials. Insulation r value is proportional to the insulating material being used. Here s a handy r value table that covers most types of roof coverings building insulation and a few other materials.

See the department of energy s doe ranges for recommended levels of insulation below. R values of common types of insulation. 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. 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 r value of the insulation for every inch of thickness depends on the type 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 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. For a very good introductory overview article on r value see r values over at the website of.