Basement Wall Insulation
In the past, basement walls have only been required to have insulation applied to the exterior walls to a depth of 600 mm below grade. As part of the Program, full-height basement wall insulation is now required at the same RSI value as above-ground exterior walls (RSI 3.85). This requirement is most easily met through the use of high-density batt insulation, similar to that for above-ground walls.
Requiring full-height basement insulation helps to increase the usable space inside our houses, while at the same time reduces space-heating needs. Basements will be more comfortable to occupy for extended periods of time, making it easier to use the floor area for bedrooms, kitchens, even whole separate suites. Cold, damp exposed concrete walls will soon be a thing of the past.
By-law Language:
Table 9.25.2.1. Minimum Thermal Resistance of Insulation RSI, m² °C/W for Buildings of Residential Occupancy Forming Part of Article 9.25.2.1. |
||
Building Assembly |
Value Required |
|
| Attic Spaces | 7.0 |
|
| Roof Joist Assemblies (Cathedral Ceilings/Flat Roofs) | 4.9 |
|
| Frame Walls (including frame crawl space walls) | 3.85 |
|
| Concrete or Masonry Walls (other than foundation walls) | 2.1 |
|
| Suspended Floors | (Framed) | 4.9 |
| (Concrete Slab) | 2.1 |
|
| Foundation Walls | 3.85 |
|
| Concrete Slabs on Ground at, above, or below grade (insulation under all slab area and around edge of slab) | 2.1 |
|
| Radiant Heating Suspended Floor Assembly Over Heated Area (insulation between heated floor and heated area below) | 2.1 |
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