Micro-cement over wet room shower tray

J

JMWilson

New Member
Evening all,
Relatively new to the micro cement’s I’ve done a few bathrooms but whilst looking at one I’m starting in a couple of weeks, they’ve a impey wet room tray with a water guard wetroom
Floor membrane (1mm thick butyl rubber) over it……
So my question is can I go over the top of it with the usual procedure or does it need taking up?
Many thanks
 
It’s 18mm ply and a grp tray, but the builder wants to put a membrane over it as another barrier (1mm fleece lined rubber) and I’m wondering if I can go over the top?
 
Did micro over an impey tray about 6 years ago. Used a product called feather it first on floor over tray and fibre backed rubber tape. Then micro over the feather it. Worked really well and still know the guy who I did it for and still no leaks and still looking good. The feather it is miles cheaper than micro so worked as a good sacrifice coat to start off with
 
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