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Do you have to grout tiles. I've noticed that abroad a lot of places just butt the tiles together and I prefer that look.
is it in a shower?
or around a bath/sink basin?
yes if so,
water will penetrate and blow the tiles of the wall
if not don't see why not,
I think you'll find that in the UK you'll be lucky to find tiles square and flat enough to give an acceptable looking job. the grout is there on the whole to take up the difference. tiles can vary wildly between sizes even in the same batch sometimes.
I think I'd aim for very tight joints but you'd have to have a very flat floors/walls for this. It won't be waterproof/resistant though if you need it to be? Most continental applications have the tiles directly into a cement based background which makes them waterproof.
Johnsons and I think Pilkingtons make tiles with chamfered edges so that they but together and self space but still has a very small jiont that would need grouting.
As blazin-saddles says, most tiles aren't made well enough to be able to be fitted flush. You can get them but typically you have to spend a bit extra.
We've just had some polished floor tiles fitted in our conservatory which were made to be fitted flush but we still went for a 1mm gap in the end.
You can see here. The tiler said that he wouldn't have been able to lay them flush (if we'd wanted them that way) if the floor hadn't been brand new and leveled off.
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how slippy is that floor with a bit of water on it