Radiant heat placed in between floor joists from the crawlspace?

[Hassin Bin Sober]

4. IMO, the best way to do radiant and tile is to embed the wires/mat in self leveling concrete.

If you are going over wood subfloor, the self leveling concrete (SLC) has be, IIRC, 1/2 inch (less over concrete or cement board) and include mesh. It makes a great tile substrate so this can be in lieu of 1/2 inch cement board.

The increase in height doesn't have to be that bad.

I tried the "one step" method of embedding the wires in thinset as you tile but didn't have good luck. I prefer to work on a clean slate.

Here's one I did for a friend/customer. It was over plywood so we used mesh. The white spots are latex primer sprayed on the mash and mat.







Another customer. Freshly poured. It sets in about 45 minutes.