Just about to tile our kitchen with Karndean flooring.
The existing flooring is thermoplastic tiles (previously covered with
cusionfloor) stuck to the concrete floor using some sort of bitumen
adhesive. Whilst there are one or two bits around the edges which have
broken up over time due to the uneveness of the concrete near the walls, the
tiles are otherwise stuck down well and I'm planning on tiling over them
(I've repaired some areas around the edge with leveling compound).
I've no experience of the type of acrylic adhesive used for Karndean/Amtico,
and was just a bit wary of trying to stick it directly to tiles that could
have absorbed a bit of dirt/grease over the years. I have some Evo Bond PVA
I was going to use as a primer but it doesn't indicate the
suitability/dilution for this sort of job. Thoughts?
You may well find that PVA would do the job very well. I'd use it full
strength. It's very adhesive indeed, although it doesn't appear to be
when you put some between finger and thumb.
However, I wonder what will happen after a few years of use. Will you be
able to see the outline of the old tiles through the new flooring? In
the days of lino, when people put old newspaper down as underfelt, you
could sometimes see the outline of just one sheet of paper after a time.
OK, so you're not using lino, but the question is worth considering.
Thanks Rob - that shouldn't be an issue. The thermoplastic tiles are laid
dead flat and you can't even feel the joints. The Karndean tiles are 3mm
thick and as tough as hide so I'm not expecting anything to show through
(the surface is textured to look like slate too which will help).
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