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Minimum thickness for concrete suspended slab
We would really like to put radiant tubing in a thin slab on top of the subfloor on the main level of new build (log home) above our basement. It’s a relatively small footprint, 24’x28’ minus the stairway. The engineer has approved the weight load. The problem is we only have 1 1/2” to work with, due to the stair height. From what I have read the minimum thickness for thin concrete slab seems to be 2”, although I have also seen references to 1 1/2”. (Concrete would be the finished floor). We are not really interested in Gyp-Crete as there seems to be issues with it breaking down over time, and also seems to rely heavily on getting all the variables correct with the right installler.
Is our only other option at this point a panel system like Warmboard with tile over top?
Thanks for any suggestions!