Ask a Tradesman
Replacing new floor tiles - essential to remove old tiles?
In a G+3 storied building, if person living on 1st floor replaces old floor tiles with new ones, then why is it essential to remove old tiles? What are the effects if new tiles are placed on old tiles?
My initial response would be DEFINITELY YES as I would imagine that the sub floor would be timber & may not be correctly fixed causing the tiles fitted on top to move over time with the floor underneath, thus cracking the grouting & then making the whole floor unstable. I would advise ripping up the tiles cleaning the floor underneath then securing the boards, overlaying with 18mm wbp plywood securely fixed with 40mm screws at 200mm spacings in a grid pattern. Applying a good quality flexible adhesive & relaying the tiles, finishing with a flexible grout.
Without seeing the job however I can only speculate on the cause of the problem. Hope this helps...!!
Answered 16th Jul 2013