Slab and foundation insulation for partially earth-bermed home
Hello GBA forum members! First post here.
We are building a slab-on-grade, two-story home that will have concrete walls on the north and west side of the 1st level. These sides will be earth-bermed and the south and east sides will be framed (sort of like a walkout basement). We will be putting PEX in the slab. We are in Wisconsin.
I am unsure of where to insulate the concrete. I want to try and keep all of it within the envelope.
Please see attached image.
Firstly, I am wondering if using foamboard along the inside of the footings makes any sense (denoted 1 & 2). It seems that no matter how its done, heat will move by conduction from the living space to the earth through the footing via the poured wall (left side). Also, I am already putting foamboard on the outside of the footing and the outside of the concrete wall before we pile earth against it.
Also, is decoupling the slab from the footing necessary by beveling the top of the foamboard?
I am still thinking about this, so I may have more questions.
Thanks in advance for any input!
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