connick159 Posted October 8, 2021 Share Posted October 8, 2021 (edited) Hi all, I'm working on the ensuite now and have seen this Marmox Plinth as a good option to build a shower tray up on top of the slab so I can get drainage underneath. (cant dig into the slab so have to go above it and out the wall for the drain.) The plinth is fixed to the slab with a flexible, cement based tile adhesive. On top of that plinth I would then install a showerlay such as this... Marmox showerlay. My question is: Could I substitute the plinth with some leftover 100mm Celotox PIR insulation? It seems like essentially the same thing. Is there any reason why this is a bad idea? Thnks in advance. Edited October 8, 2021 by connick159 Link to comment Share on other sites More sharing options...
connick159 Posted October 11, 2021 Author Share Posted October 11, 2021 For reference - decided to order the plinth and shower lay as above. Link to comment Share on other sites More sharing options...
Olf Posted October 11, 2021 Share Posted October 11, 2021 You did the right choice: XPS have twice the compressive compressive strength of PIR and does not degrade in contact with water 1 Link to comment Share on other sites More sharing options...
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