I put down porcelain tile 10 years ago. Just had to tear up a 5x5 area due to refrigerator leaking. Saved most of the tiles. Had to replace floor. When we built house 38 years ago we put down 3 subfloors. Between floor over the joist and the next floor we placed tar paper. Next layer was 5/8 plywood then covered with 1/4 in particle board. Had to replace top 2 layers. Now the problem. Old tile still has old mortar on it. How do I remove or do I try to lay tile with old mortar. Have tried removing it with no luck. Has to be used cause tiles are now out of stock. Please help
Either use a 4 1/2" angle grinder with a diamond cup---or leave out the top 1/4" layer of particle board and set the tile,old thinset and all, into a thick bed of modified thinset----
That particle board layer was not a good idea anyway --it falls apart when it gets wet.
try resin fiber sanding discs, find them at HF. they have worked for me in the past. good luck
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