How should I insulate under a concrete hydronic slab on stilts?

Cam Smith
Updated: Feb. 10, 2021

Hello all,

I have just purchased a little home in western Québec in an area affected by the 2019/2017 floods. My first order of business is raising the house to avoid future floods. My plan is to use tridodetic posts as my foundation, so the property will essentially be sitting on stilts. My second goal is to install concrete hydronic radiant floors.

Does anyone have any experience with DIYing hydronic concrete slabs on stilts. How I would go about insulating underneath to avoid heat loss as the floor will be exposed to the elements being on stilts. Can the concrete floor be poured directly on the plywood subfloor?

Thank you,

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