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Well after a few months of work from laying the concrete around the mould / pattern or whatever the time has come to fit the actual wet room shower tray base and I am looking for ideas on how best to do this and what compound to use. The pic shows the underside of the tray with a lattice of ribs. The recess in the slab is flat bottomed and concrete. The tray fits into the recess in the slab perfectly but I now have to bed it down and I can see some possible issues. I have 5-8mm of height I need to make up so whatever I bed it down on has got to make that up or I will have very thick grout under the tiles. What would be a good compound to bed it down on. A sharp sand / cement mix or some such? My second concern is / are the air pockets that will form in the lattice structure and may make getting it to bed down a problem and indeed might cause it to move if the air expands while the bedding material is drying. I could fill the pockets with the bedding compound, whatever it is to be, before I lower it into position to cure that problem but whatever happens I don't want it moving off level while the compound dries. Any thoughts welcome.
