... for a natural stone or poured concrete.
The reason I ask is I live in one of those old brick buildings in Chicago (Wrigley - maybe we are neighbors) and I doubt tile would be suitable in my unit's kitchen. That's not to say it CAN"T or ISN'T done but the risks of cracked tile and/or grout is substantial over time if "deflection" standards aren't met. Add to that the fact that developers like to move walls to open up floor-plans and not adequately brace ceiling/floor joists when they remodel these units. For instance: My living room floor bounces a little when my dog runs across the living room. My neighbor has a wall missing in her unit that is right where the support for my floor SHOULD be. The builder placed a half-assed header there but I'm sure they did a piss-poor job of securing it.
That said, I just installed some large natural stone tiles in my baths because I was fairly certain of the joist spans in that part of the building. Also, we were in a joint venture with my downstairs neighbor's bath remodel so we had access to the joists for sizing/inspection. Also, we were able to substantially "beef up" the sub-floor with extra plywood - an option for a small 4x8 room but probably not an option for a larger room.
I'm not familiar with the requirements for concrete but natural stone tile requires a deflection rating of 1/720th of the total span where as ceramic/porcelains only require half the rating at a 1/360th. I would assume concrete requirements would be as stringent. Obviously, wood isn't an issue.
Some further reading and explanation of deflection at John Bridge form which, by the way, is one of the best sources on the net for tile questions:
http://www.johnbridge.com/vbulletin/showthread.php?t=1845Where you aware that not all floor structures are suitable for the installation of tile?
Unfortunately sometimes you have to "Just Say No" To Tile.
Your floors "deflection" under both dead and live load cannot exceed 1/360th of your span, and in the case of natural stones the limit is half of that at 1/720th.
Here is the "Deflecto" calculator from www.johnbridge.com if you want to TRY and determine your L rating. I say try because, like my condo, you will probably find it difficult to determine your actual joist spans and dimensions without access to the uncovered structure (from below).
http://www.johnbridge.com/vbulletin/deflecto.pl