Minimum Roof Insulation R Value Ontario

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

Minimum roof insulation r value ontario.

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. 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. Here s a handy r value table that covers most types of roof coverings building insulation and a few other materials.

Know exactly how much you need with our project calculators. You should of course see the manufacturer provided technical data sheet for the r value of specific products. The r value of the insulation for every inch of thickness depends on the type of 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.

You may or may not be aware that insulation codes have changed for all new builds with permits issued after 2016. Recommended home insulation r values. The recommended r value for attic insulation in ontario is between r 50 and r 60. Insulation r value is proportional to the insulating material being used.

Continuous insulation this refers to a monolithic. R value is a measure of insulation s ability to resist heat traveling through it. R value of various materials. The higher the r value the greater the insulation performance.

The table below shows what levels of insulation are cost effective for different climates and. For a very good introductory overview article on r value see r values over at the website of. Insulation level are specified by r value. See the department of energy s doe ranges for recommended levels of insulation below.

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. R values of common types of insulation. When determining how much insulation you need don t guesstimate calculate. 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.

The higher the r value the better the thermal performance of the insulation. The two distinct types of attic insulation are loose fill material also commonly known as blown in insulation and batting.