Answer / bimal chettri.

First The Sunken is slab to be cleared from all loose
materials and it is to be coated with SIKA/Dr. FIxit water
proofing liquid. After that 1:2 CM plastering is to be done
and then the remaining area is to be filled with brick bats
and after that 4" PCC (1:1.5:3) is to be done with 10mm down
aggregate and after that Tiles work can be carried out.

Answer / haider

First to be clean surface properly than apply two coat of tepcrit & protection plaster after fill. By light weight filling material. After that to be done PCC. Over that.

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