Problem: ugly bathroom tile
Solution (as chosen by the HO): Glue new tile over the old.
So is there a trick to doing this? This is 4×4 glazed bathroom tile. HO wants me to tile over top existing tile. Will thinset stick tile to tile strongly? If not, what will? Also, do I need to scuff up the existing tile to make mortar bond to it? If so, what’s the fastest way to scuff the tile?
Framing the floor inside a crawlspace foundation keeps a gable-end addition close to grade.
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Replies
Yes, it's totally acceptable, provided the existing tile is bonded strong and there is no deflection (i.e., the original tile job was done right). TCA guide cites method TR712-03 as the proper technique..Namely that the floor must be cleaned (duh)--I'd use a TSP wash--and scuffed--they recommend a "carborundum disk".. No idea what that is but I've used my angle grinder w/ a concrete surfacing disk. Then reclean the floor. Then use a latex modified thinset like Tec Fullflex or Ultraflex. Of course if it's really a big deal, you might use an epoxy mortar.
I've done this a number of times, using Fullflex and been very satisfied with the results. I'd bet the bond is as good or better then the bond between the tile and underlayment.
Thanks. good info.
Will this work on a wall in a bath? Exist tile is 4" glazed on 1 1/2" thk conc, on metal sheet lath (done in 1952, still as solid as the conc slab in the basement) on 3 X 6 oak studs. Would be a bear to bust off without all the plaster falling off the other side of the wall (in a bedroom).
Yes. Same method; same procedures. If you'll be extending the new tile beyond the old, special attention will be needed at the transition. Sounds like your substrate will be quite sound. Be sure and get off ALL the soap scum, scuff it, and tile over it. Caveat: my idea of using an angle grinder to scuff the old tile might be a bit harsh for 4x4 wall tile. Another method is using an acid wash (probably sulfamic--ask your tile supplier for an etcher). The fumes will destroy any metal in the room though if it's not vented well during the application..Therefore, using the bathroom fan is not a good idea as it'll be a rusted hulk in a week. Might also try a belt sander. (And remember, you don't need to remove the glaze--just scuff it). Then wash it with TSP and rinse well.
Transition will not be a problem since I will not extend new tile past exist. As it is, the exist is about 1" proud of the plaster wall above. Plan to do a strip of wood maybe, or marble to "cap" off the edge.
Don't like messing w/ chemicals that strong much. But I LOVE running power tools, so my six pack will be riding on a combination of belt sander, grinder, dust masks, goggles, and oh yeh, the afore-mentioned six pack.
Thanks again for the info.