I have laid self levelling compound onto quarry tiles as it was uneven. the
quarry tiles are sound with no movement. It levelled nicely but today i have
looked and there are cracks and slight movement where the cracks are it is
as if the compound has not adhered although the floor was thoroughly
cleaned. Any advice on what i have done wrong! Any tips or suggestions what
will remedy this.
Quarry tiles might be too porous. The compound would then dry out too
quick causing the cracking and the failure to adhere properly. Also
these compounds aren't very good, especially if laid thinly.
PVA on the tiles a few hours before applying the compound might solve
If you're willing to shell out? bond the the SLC that is already down with
dilluted PVA,mask the cracked areas with plasterers scrim tape and bond
Mix and throw down at the very least 3 to 4 bags of the SLC again.
Does it? Oh well, the stuff I put down in my hall was, oh at least 3mm
thick. It's survived the onslaught of two boys, my workbench and deity knows
what else for the last 6 years. Mind you it is laid down on the concrete
floor so it is pretty well supported and has vinyl tiles (I'm tasteful you
see) on top.
The stuff (latex screed) my friendly tiler did for me in the kitchen is even
If it's tiled over, has a sound base and has adhered well it'll be fine.
If it's laid too thin it can crack dry out too quick & fail to adhere,
this is where PVA comes in.
Is the original poster planning to tile over the quarry tiles?
I tiled over mine after the kitchen extension was done, they were
chipped, & some were missing. I used a waterproof adhesive which IIRC
could be laid up to 10mm thick to even out the surface. There were
deeper holes where tiles had been removed, I filled these with concrete
and allowed to dry. The finish was excellent.
I can't remember the adhesive name but is was sold in 5kg powder bags,
and is grey. It's also flexible, before we had the extension we tiled
over part of the dining room floor, enlarging the kitchen. This is a 70
year old suspended floor with a little movement. No cracks appeared in
the 7 years or so there were down.
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