A while ago I posted about how our radiant floor heating was installed... Here's how the concrete is poured to hide the piping, and on top of this will be the floor. :
Radiant Floor Heating and Epoxy Coatings | California Custom Coatings
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Radiant Heat in Garage Floor - John's House Episode 4 - YouTube
Modern radiant heating systems will use PEX tubing which will be embedded in the floor. He… | Radiant floor heating, Heated concrete floor, Installing heated floors