Minimum Roof Insulation R Value Ontario

Continuous insulation this refers to a monolithic.

Minimum roof insulation r value ontario. Insulation r value is proportional to the insulating material being used. R values of common types of insulation. You may or may not be aware that insulation codes have changed for all new builds with permits issued after 2016. 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.

See the department of energy s doe ranges for recommended levels of insulation below. The r value of the insulation for every inch of thickness depends on the type of insulation. The recommended r value for attic insulation in ontario is between r 50 and r 60. The higher the r value the better the thermal performance of the insulation.

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 higher the r value the greater the insulation performance. Here s a handy r value table that covers most types of roof coverings building insulation and a few other materials. R value of various materials.

The table below shows what levels of insulation are cost effective for different climates and. The ontario building code requirements for insulation is only one of many sections within the act that helps protect you and other people. A bare concrete wall basement foundation rates at an insulation r value of about r 1. For a very good introductory overview article on r value see r values over at the website of.

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. R value is a measure of insulation s ability to resist heat traveling through it. When determining how much insulation you need don t guesstimate calculate. Insulation level are specified by r value.

Recommended home insulation r values. 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. In simple terms the higher the insulation r value the more thermal resistance. Newly insulated attic rates at an insulation r value of r 40 or more.

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.