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Old 03-20-15, 06:04 AM   #11
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Best to dig straight down to the footing with more than 2" (3"+ is better) but to save money use EPS (Plastifab is available at HD, not that I like to promote them), then go out at least 2' horizontally if you can. It will work well. You don't need to do under the footings if there is none under the slab (or even if there is, it's a bit late).

Are you going to heat this space only when you are in there?

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Old 03-20-15, 11:45 AM   #12
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The footing is "on-grade" and because of that I am a little nervous to dig down several feet, and thus the horizontal theme.
The floor is still pallets with OSB screwed on, but the plan is to have in-floor heat sometime down the road. When the concrete is poured, the plan is to insulate the slab, as well. To add to that, I've been thinking of installing metal tubing inside the rocket stove heater to provide the heat on non-sun days.

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