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Got the call lastnight, we dig today.
.......Then insulation will be placed on the inside of the foundation wall.............I'm not really familiar with garage footing/short block wall construction vs. a traditional basement footing and block walls. Should you not be putting rigid insulation on the outside of the block wall vs. inside it to protect it from freezing? Around here there would be continuous 2" rigid foam on the exterior from the footing right up to the eaves and 2" of rigid foam board + a vapour barrier under the concrete slab as well. Maybe I missed this discussion in previous posts.
This diagram shows pretty much exactly what we are doing.I'm not really familiar with garage footing/short block wall construction vs. a traditional basement footing and block walls. Should you not be putting rigid insulation on the outside of the block wall vs. inside it to protect it from freezing? Around here there would be continuous 2" rigid foam on the exterior from the footing right up to the eaves and 2" of rigid foam board + a vapour barrier under the concrete slab as well. Maybe I missed this discussion in previous posts.
Yes, that diagram I referenced above was the first one that I found in a 30 second search with Google. It isn't 100% accurate to what we are doing but showed a pretty good diagram of it. We are going with full 2" under the slab as you mentioned. I want to say code changed on this at some point in time fairly recently where I know they require 2" of foam outside the block if it is a basement. Not sure if that also applies when it is a foundation like we are doing. Clearly the trench is big enough to add it outside as well if needed, just not sure if they are doing it.OK, I see what you intend to do. Similar to what I was referring to except we'd be adding 2" of foam board on the outside of the blocks as well + using a full 2" of insulation under the slab not just around the perimeter of the block wall. Given cost of heating long term for relatively minimal money you could use 2" foam board everywhere under the floor and get an overall R10 vs. R5. IMHO.