Radiant floor in very thick slab
I’m working on a project (climate zone 4C) that will use a thick (~16″) raft slab due to poor soil conditions and the client is interested in a radiant system as well.
If the pex tubing were held approximately 2-3″ below the top of the slab and the entire perimeter and sub-slab were insulated to R-20 would it make sense to use a radiant system?
I imagine at the very least it would be a huge flywheel that a very long time to heat up or cool down, so you’d have to just set the temperature and leave it alone.
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