Wet room and underfloor heating

22 Nov 2006
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United Kingdom
i am currently fitting Wet UFH on the ground floor of my house ( being refurbished) new concreted floor laid, 120mm celotex been laid on top and then ready for screed - approx 7cm. I would like to fit a Wetroom in a downstairs toilet area approx 2m x 1.2m and plan to fit a preformed tray but would like some advice please. I have not yet laid the ufh pipes in the room yet:

- do I screed round the pre-formed tray and the drain is cut out into the celotex or do I have less depth of celotex and more screed in this tray area so the drain is supported by screed
- do the underfloor heating pipes run under the tray or outside the tray area?

Any other pointers would be appreciated. Thanks in advance
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The preformed tray would be approx 1m x 90cm at one end of the room and the toilet on the opposite side

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