My conservatory has a well insulated concrete slab with a 4"
upstand of insulation around the edge, including across doorways,
where the insulation at the edge was visible, before tiling
over.

I tiled it in limestone tiles & a couple of years later, adjacent
to some french windows, hairline cracks appeared across the tiles
in the vicinity of the transition from slab to the edge
insulation. I'm presuming the dissimilar materials under these
tiles have contributed to the cracking.

If I was doing it again how could I have avoided this?

TIA
--
Jim K


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