I dont have an option, with the new under floor heating comes a level entry shower, in the most stupid place you could think of. So the shower base has to be formed from concrete, as available depth and dimensions negate shop made products. In one place there will be 5mm under tiles over 6" pipe. So I need to incorporate a membrane (sheeting is out of the question) in the concrete before the tiles. What are my options?
I know I should have said no in the first place but its her mum and level entry is the only option.

if ive read the post correctly what you are asking is " what tile membrane to use"? if so there are a few options like homelux tanking or kerdi (i think its called) these would be laid using cement based tile addy before you tile! they can also be run up the walls too! hope that helps! ,

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IF IT WERE EASY ITD B BORING!

Sorry, cant fix a membrane.
But you have guided me to Tanking Slurry, which is what I need, and didnt know about. Its for tanking cellers so a shower a day isnt going to raise any issues. Will post results.

If someone had thought about it they could have fitted a floor gully and had a wet room.

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If the next door neighbour hadn't been an arse then the foul water pipe could have been installed below the slab and it wouldn't be millimeters below the centre of the shower front to back. If the dodgy foundations hadn't projected out from the wall the foul water pipe could have been next to the wall, R/H side. It could have gone left of centre but at the time of installing there were other undecided options on other factors L/H side. If I could have shop bought then I would have done so. Ive formed an outside concrete shower base before and it is as bad as crazy paving for trying to get it just so. Shop bought would also have been cheaper and quicker as its all pre-formed.

i still cant understand why you cant lay a membrane before tiling though!

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IF IT WERE EASY ITD B BORING!

The type of membrane Marc is talking about is like this, which is around 3mm thick. I too can't see why this would be a problem Is the floor that tight?

What sort of UFH is it? wet or electric?

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Professional Kitchen & Bathroom Fitters | Master Painters and Decorators | Brighton & Hove

Sorry to have taken so long to reply, its wet UFH. Do you have a name for the membrane as Ive not found this on my searches only sheeting that needs a good depth of covering.

Ditra from Schulter or for a cheaper alternative Durabase Ci from Dural

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Professional Kitchen & Bathroom Fitters | Master Painters and Decorators | Brighton & Hove

Have been to the site and thats good stuff thank you.