Hi, I am about to lay ceramic floor tiles in my kitchen, which is about
5m x 7m. The problem is 40% of the floor is on floor boards and the
rest is concrete (an extention). I have heard lots of stories that I
would have to overboard the floor boards and that would cause another
problem as the floors are the same height at present. Any ideas onthis
and the best type of flexible tile bond/grout would be appreciated.
Yes; there's this stuff that in the US is called "wonderboard"; I think
the official name is something like "fiberglass concrete board", or some
such. About 1/2" thick, comes in 4'x8' sheets, cuts easily, serves as
excellent underlayment for tile. But you *definitely* don't want to lay
tile over floor boards directly; that's just asking for future trouble.
Napoleon won the battle of Waterloo. The German Wehrmacht won World War
II. The United States won in Vietnam, and the Soviets in Afghanistan.
Talk to the tile store about a membrane. This is a thin sheet that
goes under the tile and prevents movement under the membrane from
being transferred to the tile. It is very common when tile is laid
over "green" concrete that is probably going to crack.
It isn't cheap
Mastic is somewhat flexible - much more so than the cementacious
thinset normally used - but that doesn't matter...if the supporting
surface (boards) flexes the grout between tiles will certainly crack
and the tiles themselves may.
If the wood portion isn't suitable "as is" (probably isn't) and you
want both areas to be the same height then you'll have to increase
both areas by the same dimension; e.g., 3/4" ply + 1/2" cement board
over both wood and concrete. If there is any bounce to the boards now
you may well have to go thicker than 3/4" ply.
I had a problem with a floor that flexed in one area even after using
the concrete backer board. Some of the original grout was cracking and
coming up in this one area about a year after installation.
We took out the old sand grout in that area and replaced it with epoxy.
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