Roof Insulation R Value Ontario

When determining how much insulation you need don t guesstimate calculate.

Roof insulation r value ontario.

A bare concrete wall basement foundation rates at an insulation r value of about r 1. Recommended insulation levels for retrofitting existing wood framed buildings. 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. In such cases where r value is assigned this may decrease the r value requirement for batt 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. See the department of energy s doe ranges for recommended levels of insulation below. All insulation materials in ontario must meet requirements set out by the national government. 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. 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. 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 higher the r value the greater the insulation performance.

For a very good introductory overview article on r value see r values over at the website of. Know exactly how much you need with our project calculators. The two distinct types of attic insulation are loose fill material also commonly known as blown in insulation and batting. 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.

Add insulation to attic. R value of various materials. The recommended r value for attic insulation in ontario is between r 50 and r 60. 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. R values of common types of insulation. Insulation r value is proportional to the insulating material being used. You should of course see the manufacturer provided technical data sheet for the r value of specific products.