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soberjulie 08-16-2013 06:26 PM

Do we have the steps right?
Hi Folks....we just want to make sure we aren't forgetting any steps:

( kitchen renovation. We installed 5/8"ply on the floor, and now we are ready to install the in-floor heating. Not a mat, the heat cable/wire)


1) Clean the floor really well.
2) Apply/spray a bonding agent on the plywood.
3) Install the heat wire.
4) Apply thinset (being careful not to nick any heat wire)
5) Ready for tile.

Does this look right?

JazMan 08-16-2013 10:28 PM

It might be right, I can't tell from the little info you supplied.

Is the 5/8" ply the subfloor or underlayment?

Is the framing stiff enough for tiles?

What brand warming wires and what do they say?

What type of tiles? Is the floor flat enough?


soberjulie 08-17-2013 06:32 AM

My bad. I should know to supply as much info as I have :)

The 5/8" ply is what we put on top of the existing tongue and groove. (1" thick laid diagonal, 5-6" boards)
Ran the deflector and were good...we're putting down 24x12 porcelain tile.
The wire brand is 'stelpro 240wat'
The floor is pretty darned flat for this old house ;)
(No humps or dips, checked with laser level)

Shoot. Do we need an underpayment on top of the subfloor?

oh'mike 08-17-2013 07:06 AM

Check with the heating manufacturer---Typically the wires are fastened to the floor--then a layer of self leveling compound is used to embed the coils.

The tile is set on top of the self leveling compound.

Daniel Holzman 08-17-2013 07:47 AM

We installed our in floor electric heat using thinset over the wires. This was in accordance with manufacturer recommendations. You need to be very careful you do not nick the wires, so we used a plastic thinset application tool (again in accordance with manufacturer recommendations). We had the option of a self levelling compound, but since our floor was pretty flat, it was not necessary. We had to mechanically fasten the wires first, manufacturer recommended hot glue or staples as I recall, we used hot glue in a few places.

soberjulie 08-17-2013 07:49 AM

Thank you. :)
There's a pretty good installation video on the heated floor cable in the company website. We've only installed a mat before, so the wire is new to us.

Just making sure we don't need anything in top of the subfloor before we begin.

oh'mike 08-17-2013 07:17 PM

I don't know about thinset over a plywood subfloor---I would not do that myself---properly prepared, self leveling compound is approved for that use---Mike----

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