FPSF question – limited space for insulation
I’m designing the shed, about 100sf, flat roof, zone 6. I’m going to run radiant in the slab for heating. I’d like to do a FPSF for performance of the radiant, in fear of it heaving and mostly because it’s fun.
My major issue being 3 sides of the slab will be on the lot lines and against fencing, so fun things like permiter wing insulation are not possible.
I took a look at an old CMHC guide (attached photo) which recommends a 6″ slab, 12″ deep perimeter footing and 2″ of vertical EPS along the perimeter and in my area 2 feet of wing insulation.
Since I won’t be able to do the wing insulation, one thought would be to increase the the Rvalue/thickness of the perimeter vertical insulation, but even that poses an issue since the more I have to step in the 2×4 walls inward & away from the fence to have it bear on the foundation the less ideal it is.
Does anyone have any design suggestions or experience with this?
Thanks in advance,
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