what is the maximum make up that can go ontop for the drain to still work. I potentially have 15mm , would this work?

Dear Richard,

15 mm is the maximum thickness of all material that you would install on top of the tray. 

Same tray with tileable cover accepts up to 20 mm floor finish material thickness, available here:

Showerlay Wiper 900 x 900 mm Point Pure

Alternatively we do have other drain types, available only in linear version, which do not have any restriction for finish material thickness at all, you can see them here:

Showerlay Wiper Line Invisible

I would be happy to assist if you have any questions.

Kind regards

David 020 7193 0953

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