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

Discussion in 'Tiling' started by Safety First, 6 Sep 2020.

  1. Safety First

    Safety First

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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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  3. Bonni

    Bonni

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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.
     
  4. Safety First

    Safety First

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    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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