And this R24 wall assembly isn’t just for Ontario, there’s added value for industry stakeholders in other provinces, such as Alberta for example, to adopt this wall assembly.
In fact, the efficient R24 below and above-grade wall assembly shown below can also extend beyond Canada and into the northern parts of the United States of America (USA) as well.
Figure 1: Effective R24 Wall Assembly
Breaking News – Ontario’s Expected Tier 3 Harmonization with the National Building Code of Canada
The call for harmonization of Provincial building codes to the NBC has been a priority for Provincial and Federal levels government for some time. Harmonization is expected to reduce variation between different jurisdictions and make it easier and less costly for industry, manufacturers, and suppliers to meet the demands of the Canadian construction industry.
In January of 2022 the Ontario Ministry of Municipal Affairs and Housing announced proposed changes to the 2012 Ontario Building Code (OBC) that would see the next addition harmonize with the 2020 NBC. This could mean Supplementary Standard SB-12 will no longer exist and will be replaced with a single tier from the 2020 NBC (tier 3).
Compared to where Ontario currently sits related to residential building enclosure requirements, tier 3 of the NBC represents a marginal increase in energy efficiency.
This minor increase in energy efficiency begs the question, “How will Ontario achieve a net zero energy ready building code by 2030?”.