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Hi! I am looking for some feedback regarding the use of a polythene membrane between my UFH in drymix and the CaberDek floor above. We have no such thing installed, is it essential? I have only seen it suggested once as a recommendation on a website. The floor is: 200mm celotex, osb, pipes stapled to osb and buried in a sand/cement biscuit mix then topped with chip board floor boards. Any insight here would help. The supplier and fitter of our UFH both say that based o. The build up of our floor they have never used polythene membrane as suggested. Only in larger commercial builds where a concrete slab has been laid would they consider it. Your help is much appreciated! Thanks