Exterior Wall Insulation R Value Ontario

An air barrier can be many things such as exterior sheathing or a vapour barrier.

Exterior wall insulation r value ontario.

In such cases where r value is assigned this may decrease the r value requirement for batt insulation. Achieving greater r values in exterior walls. Title toronto home insulation insulation shall be installed so that there is a reasonably uniform insulating value over the entire face of the insulated area. The r refers to absolute thermal resistance.

Recommended home insulation r values. In the province of ontario the building code for exterior walls has changed in the last couple of years several years ago they outside walls had to be r 20 to meet the minimum code requirement. The higher the r value the better the thermal performance of the insulation. Where insulation is exposed to the weather it must be kept protected by 6mm thick preservative plywood or 12mm cement parging.

The ontario building code installation of thermal insulation. The table below shows what levels of insulation are cost effective for different climates and. R value is a measure of insulation s ability to resist heat traveling through it. Where exterior walls are not supported by footings extending below frost level.

You can achieve better thermal performance in your attic by adding an additional layer of insulation. As a fast option to increase the wall rsi value while reducing thermal bridging install at least rsi 0 88 to 1 76 r 5 to 10 rigid board insulation directly to the wall finish and cover it with drywall. Installation of loose fill insulation. See the department of energy s doe ranges for recommended levels of insulation below.

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. Insulation susceptible to water damage must be kept a minimum of 2 above a crawl space floor. Today the minimum code requirement is r 24. R value is a standard unit of measurement for determining among many things how effective your insulation will be.

You will still need to ensure the vapour barrier is sealed and will have to reposition such things as electrical switches and plugs. Insulation level are specified by r value. Here are some of the most common ways. Higher r value numbers mean that the insulating material resists the cold or heat from the outside better.

There are several options for people to meet this new code.