I've a bathroom to renovate. Currently it's laid with Quarry
Tiles with a 10mm grout line. The grout appears to be cementacious,
and the adhesive is a black material laid about 8mm thick.

SWMBO wants waterproof laminate, there is a shower, but it's used
infrequently, AC5 should do.

I'd like to lift this floor, it's about 4 sq metres, with my Makita SDS.
If I don't lift it, I still need to level the tops, and then the step up
into the room will end up being 50mm (current 30mm step + leveling +
underlay + 12mm laminate). If I take the QT's up then I'll have a hell
of a job leveling.

What should I do? Take 'em up and use lots of self leveler laid in
batches/layers , or leave them down, level on top and then accept the
50mm step up.

Moving to the walls, They are currently tiled over screeded-blocks.
I call it screed as it seems to be mortar not plaster. The tiles are
very very well adhered and I can only get them off in tiny pieces with
the SDS. I've done one small wall to test.

We will tile the walls with 10mm thick ceramic tiles. I'm confident
that the old tiles/advesive will hold the weight, but will the new
adhesive over old tiles? Again I have the problem of making good after
the old tiles are removed. In the shower area I am putting Marmox up
as a water barrier. I could line the rest with PB, or attempt to true
them up with bonding plaster or whatever. I could even pay out for a
plasterer to do the job, but I'd prefer not to. If I stick with tiling
over the old tiles what adhesive should I use, and how should the old
tiles be prepared?

R.

"TheOldFellow" wrote

snip...

Haven't answered the floor question as it seems a decision only you can
make!

Moving to the walls, They are currently tiled over screeded-blocks.
I call it screed as it seems to be mortar not plaster. The tiles are
very very well adhered and I can only get them off in tiny pieces with
the SDS. I've done one small wall to test.

We will tile the walls with 10mm thick ceramic tiles. I'm confident
that the old tiles/advesive will hold the weight, but will the new
adhesive over old tiles? Again I have the problem of making good after
the old tiles are removed. In the shower area I am putting Marmox up
as a water barrier. I could line the rest with PB, or attempt to true
them up with bonding plaster or whatever. I could even pay out for a
plasterer to do the job, but I'd prefer not to. If I stick with tiling
over the old tiles what adhesive should I use, and how should the old
tiles be prepared?

I retiled a bathroom that was tiled half way up.
Got a plasterer to level the top half of the wall with the lower tiled area.
Then used BAL White Star for all tiles. I did actually grind grooves in the
tiles to help the adhesive to key, but don't think that is strictly
necessary.
The tiles I fitted were nearer 6 thick.
Recommend you give BAL a call with all details - IIRC they have a decent
support department (that was 5 years ago though).

Phil