Building a 26x32 cabin on a heated slab on grade and want to add a 12x12 extension as a screened room. The plan is to have the extension and roof attached to the cabin. Can I extend the concrete slab for this extension and not have it heated? Concerned that the concrete will fail on the extension as the heated slab will float differently then the non-heated section (Northern Canada build with cold winters). Also, when adding a deck to slab on grade building, does it have to ve floating and detached from the building? Thanks!
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