UFH Heating Sensor Help

[siremastimus]

Hi

I've bought a pack of UFH from uheat as recommended on here. I have taken up the old floor boards, reinforced the joists with noggins and plan to lay 18mm WBP plywood where the boards once were. On top of this I plan to put down 6mm Marmox boards on some Mapei Kerraquick and then some SLC on top before finally laying the tiles in flexible adhesive, my question is that with the senor conduit being about 16mm thick can I take a 10mm channel out of the WBP ply with a router and then lay the 6mm marmox boards either side of the protruding conduit the sensor is in before covering in SLC if that makes sense!

Thanks

 

[Mike]

I wouldn't take that much out of the ply as you'll be seriously weakening it. Try making a smaller conduit by cutting a small plastic pipe in half and remember you will have 6mm. Of slc to cover the thicker u heat cable and 7/8mm of the cement boards to deduct from your final depth of conduit.

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[Stewart]

I don't use the conduit, I just install a spare sensor and slc over the top of it. You better check with your mat supplier to make sure this is ok, but it was given the ok by mine.

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[siremastimus]

Yeah I was a bit concerned by taking that much out, I think the conduit is standard size (was supplied with the kit). Maybe a better idea would be to 4mm out of the ply and then let the 6mm for the backer boards and the the 6mm for the slc take up the rest?

 

[siremastimus]

Yeah I have got a second sensor so could install both perhaps, just would be nice to get in conduit if possible for the extra protection. Taking 4/5mm out of the WBP plywood should cause an issue should it?

 

[Dan]

It creates a weak spot that's the problem. Although it's only 25% of the thickness you'd intend on taking out, it'll make that area a lot weaker than the rest. If you do need to do it, don't cut a v-type shape in it, do a sort of half circle which would be much stronger. (If you have a router bit that sort of shape).

I'd even consider cutting a shape into the back of the tile(s) that needs to sit on that area moreso than the substrate. I've done this before by placing the tile on top of a wet cutter that has no guard on it. Quite dangerous to be honest but if you take you time considering it'll just be one or two tiles it can be done.

If you have time and can plan it, take 3mm out of the board and whatever you need to out of the back of the tile, and sort of do a bit of both.

 

[siremastimus]

Mmmh maybe setting in the SLC is the best option and install two sensors, does anyone know if this is OK with Uheat product?

 

[Dan]

I'd give them a quick call. They should be fine with it I'd have thought but it's their call.

 

[Gazzer]

I would have used 10mm Marmox and by the time the UFH was laid you would only need a channel in the Marmox.

 

[siremastimus]

Thanks but I have the 6mm Marmox ready to go one the floor so its quite tight spacing wise

 

[Uheat - Keith]

A good system would be the 12mm Conduit in 6mm SLC & 6mm Marmox board.
That way, not cutting into the 18mm ply.
Conduit is 12mm, to allow approx 8mm sensor end, wire about 5mm.

Make sure sensor at end of wire is approximately 35 – 40mm from any heating element, if it is in the conduit or if outside the conduit.

The conduit is so the floor sensor can be removed in years to come if you wish to replace Controller for different model.
.
Warm regards,