4 concrete slabs. 25 years old. Tile straight over joins??

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We have a utility area. Concrete slab poured in 4 sections. Two small rooms (larder and WC) with boundary at threshold onto the hallway section which itself is 2 strips about 2 m X 0.6 m.

Given shonky build of the whole thing I strongly suspect there's no dpc nor bar in the slabs.

Was about to s l compound over the lot ahead of slate tiles. Then realised that while the slabs haven't risen up markedly the boundaries have chipped/crumbled slight along the unions. Indicates some movement over the years.

Subsequent to slate tiles, any movement will telegraph in tiles. Don't really want to raise height with a board of some kind and would likely struggle to stick one down as across span of overall floor there's likely enough change in level to snap a board?

Has anyone gotten away with this type of thing, in spite of that voice saying "what if" ?

Alt' is to s l compound and lay vinyl...
 
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I never tile over the joins in slabs, do so at your own risk as I can guarantee the tiles will snap.
 
I never tile over the joins in slabs, do so at your own risk as I can guarantee the tiles will snap.

Thanks.
Had a feeling it might be a 'no no'.

Is there a board or system of boarding that I moderately skilled diyer could install with some kind of substrate/bonding? Obviously the joins would not overlay the slab joins, but would they not then become the site of cracks?
 

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