Ontario Building Code, 2012
Except as provided in Section 3.17. of Division B, Section 9.40. of Division B and Part 11 of Division B, if an existing building is extended or is subject to material alteration or repair, this Code applies only to the design and construction of the extensions and those parts of the building that are subject to the material alteration or repair.
My house. 1962 4-level back-split. Wood frame construction, Clad in double brick.
We're re-doing the kitchen. On part of the job will be to frame out the exterior brick wall with 2x4's instead of the existing 1" furring strips. The reason for this, is to allow enough depth in wall for modern electrical boxes. We are not interested in having boxes sticking out of the wall.
I'd also like to add some insulation in there while I'm at it, figuring "Hey, Why Not?"
Now it appears that the Ontario Building Code might put the kibosh on the entire (insulation) project.
The insulation section states that exterior walls in my area should be R22. This means I have to stud out the wall with 2x6's in order to fit in a batt. This would be an unacceptable encroachment on the space, and make the windows look absolutely ridiculous, having something like a 12" sill.
If this portion of the project is considered a "material alteration or repair", then I have no choice but to forgo adding any insulation, and find some sort of decorative box that looks ok sticking out of the wall. (this seems counter-productive, as any insulation is better than none).
If this is not "material alteration or repair", then I can proceed as planned.
I figure replacing the drywall wouldn't trigger the new code, as it's finish work. If anything triggers the code, it would be the replacing of the furring strips with 2x4 studs. What if I simply attach 2x3's to the furring strips (1") and fill with insulation. Is that a sufficient loophole to get past the Permit Overlords?