Hi all, i have been searching online and i cannot find the answer to my problem. I am installing a wetroom. I have removed the existing chipboard flooring and replaced with 25mm ply and an Impey former. I am about to line the floor area with Tilesafe and a Devimat UFH. My question is will it be ok to put a groove in the ply and place the floor sensor in and then lay the Tilesafe membrane over the top or does the sensor have to be laid over the membrane. The reason for asking this is because the sensor is required to be laid in a 10mm thick tube and would increase the overall floor height.
Thanks in advance
Garry
I used to run an underfloor heating company and can advise on this one
Really your probe should be on the same level as the under floor heating cable so above the membrane. You can either... forget the tube... and should it fail in the future you just snip off the cable near the stat and then feed a new sensor cable as close as you can to the surface of the
tile (not best practise but it happens). Maybe there's a unit or some boxing in you could feed the new cable to that would still detect the floor temperature and meaning you don't need to pull a
tile up. Or you can use the tube all the way through the wall and down to the floor but not actually under the tiles. And then should it fail you pull at it and break it where near where it enters the floor and then feed a new one down as far as it will go... providing you haven't fed the sensor cable too far into the tiled floor (given the fact that your heating should be 100mm away from the wall approx and your sensor between that and the wall) you should have 50mm of broken sensor cable stopping you from pushing the new sensor into the tiled floor, but it should get a reading still... it just maybe on higher setting.
Even when you use the tube, the sensor diode on the end of the sensor cable (which is the thing that does the work) would still need to be out of the tube and in my experience it's the sensor that goes if anything in the future as it does much more work than the heating cable in the sense that it's doing something and reading the temperature periodically even when the heating is set at room temperature and isn't switching on. That's why you have a 2 year guarantee on stats and sensors and 10 years at the least (if not a lifetime - as with most good suppliers now - not devi
) for the cable.
So given that fact. If your sensor did fail and you fitted it as per manufacturer's recommendations you'll still have an inch of sensor sticking out the end of the tube feeling the floor. And as floors need 100% coverage for floor tiles, and as you're sticking to wood and using a good strong flexible adhesive.... you'll not even be pulling that cable up the tube in 90% of installations.
So just using the tube to get you to the tiled floor (assuming you're coming down or through the wall to skirting level with it) - you should be ok.
Welcome to the forum by the way.
