Minimum R Value For Roof Insulation Ontario

The revised lttr values are as follows.

Minimum r value for roof insulation ontario.

When determining how much insulation you need don t guesstimate calculate. R values of common types of insulation the two distinct types of attic insulation are loose fill material also commonly known as blown in insulation and batting. The higher the r value the greater the insulation performance. Recommended insulation levels for retrofitting existing wood framed buildings.

The recommended r value for attic insulation in ontario is between r 50 and r 60. The ontario building code requirements for insulation is only one of many sections within the act that helps protect you and other people. 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. Thickness inches new lttr values per inch thickness new lttr values per thickness 1 5 6 5 6.

Minimum insulation r value requirements non residential above roof deck. Add insulation to attic. The r value of the insulation for every inch of thickness depends on the type of insulation. See the department of energy s doe ranges for recommended levels of insulation below.

R value of various materials. Here s a handy r value table that covers most types of roof coverings building insulation and a few other materials. You should of course see the manufacturer provided technical data sheet for the r value of specific products. 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.

Know exactly how much you need with our project calculators. 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. A bare concrete wall basement foundation rates at an insulation r value of about r 1 newly insulated attic rates at an insulation r value of r 40 or more. For a very good introductory overview article on r value see r values over at the website of.

Insulation r value is proportional to the insulating material being used. Existing 3 4 inches of insulation. The updated lttr test methods will result in lower lttr values than previously published. The ontario building code act is a legal framework set up by the provincial government to establish minimum building standards and it applies to any new builds renovations or change of use construction.

It means that different products require different densities to deliver the same r value.