How to level puddle flange?

[Pado]

I have recently installed a puddle flange into a concrete shower floor and because the original house plumbing was not quite vertical and because of different slopes of the existing floor my puddle flange is about level with the concrete on one side but is about 5mm below the concrete on the other. Because of the slopes on the floor I have decided to use sheets 300x300 of 90x90 smaller tiles(if this makes sense).  I do not wish to grind down the higher concrete as this would make the slope too great on one side.  Any ideas for filling this area before the waterproofing is done please.

[billy3]

you really should avoid

any form of drilling and screwing in the shower area ,i  am a bathroom renovator for 30 years .

[JacobZ]

Hi @billy3,

You're absolutely right on that point. 

If drilling can be avoided in a shower area, especially after the waterproofing has been completed, it certainly should be.

Jacob