Sifu sekalian, anyone have idea how much roughly it will cost to waterproof my bathroom floor? let say around 6ft x 7ft.

Im having headache of complain of leaking from my unit downstair.

This is the 2nd complain, last was 3 years ago and I water proofed the old way ( remove tiling reinforce water proof the old way).

Was thinking of doing silicone on the whole floor? will it be better.

tq sifu.