Evo-stik do a "highly flexible" tile adhesive which supposedly allows tiling
direct onto a wooden floor. Does anyone have any experience of this stuff
and what limits it has?
The area in question is tongue and groove floor boarded, but does flex a
little more than it should in places courtesy of central heating fitters.
Putting marine-ply board on top of the floor boards to tile on is going to
cause me one or two problems with door opening and the like, so I thought
this might be worth exploring....
Never tile directly into a t&g floor as, in the first instance, you'll ruin
the floor and, secondly, it is not stable enough for direct tiling, even
with a 'flexible' adhesive. I would recommend overlaying the floor with WBP
Ply (9mm minimum), screwed at 200mm centres each way. Then fix the tiles
with a highly flexible, rubber based adhesive (such as BAL Fastflex) and
using a cement based wide joint grout with added flexibility, by either
using a polymer modified grout, or by adding a liquid polymer to the cement
based grout (such as BAL Wide Joint Grout with GT1 additive). You don't need
to use marine ply - that's an extravagance. You will likely need to trim the
bottom of the doors. If you don't have the confidence to do it yourself, get
a joiner to do it. Don't be a cheapskate - do a proper job!
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