Minimum Roof Insulation R Value Ontario

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.

Minimum roof insulation r value ontario.

Here s a handy r value table that covers most types of roof coverings building insulation and a few other materials. The recommended r value for attic insulation in ontario is between r 50 and r 60. Minimum rsi value of assembly 2 zone 1 less than 5000 degree days zone 2 5000 or more degree days opaque wall assembly 2 63 3 83 wall assembly adjacent to unconditioned space 1 61 2 02 below grade wall 3 2 11 2 82 roof assembly 3 91 5 68 floor assembly over unconditioned space 4 52 4 52 column 1 2 3 notes to table 12 3 4 2 a. For a very good introductory overview article on r value see r values over at the website of.

In simple terms the higher the insulation r value the more thermal resistance. When determining how much insulation you need don t guesstimate calculate. Insulation r value is proportional to the insulating material being used. Insulation level are specified by r value.

You should of course see the manufacturer provided technical data sheet for the r value of specific products. R value of various materials. R value is a measure of insulation s ability to resist heat traveling through it. Newly insulated attic rates at an insulation r value of r 40 or more.

The table below shows what levels of insulation are cost effective for different climates and. R value measures how well certain building insulation materials can resist heat. The r value of the insulation for every inch of thickness depends on the type of insulation. 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. Know exactly how much you need with our project calculators. The ontario building code requirements for insulation is only one of many sections within the act that helps protect you and other people. R values of common types of insulation.

The higher the r value the greater the insulation performance. Recommended home insulation r values. Continuous insulation this refers to a monolithic. 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.

A bare concrete wall basement foundation rates at an insulation r value of about r 1. The two most important changes in the code for insulation have to do with continuous insulation throughout the building and increasing attic insulation from r 50 to r 60.