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What is acceptable flatness for floor tile base?

Discussion in 'Tiling' started by pilsbury, 25 May 2018.

  1. pilsbury

    pilsbury

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    I've self levelled my concrete floor. Has got rid of some irregularities but has not turned out to be the billiard table I was naively expecting. The main kitchen is approx 8x5m and I'm hoping to lay 600x300 tiles.

    If I lay a nice straight 4m length of 5x2 there is an area in the middle that dips to varying degrees. I suppose in the worst instance about 8mm, but an average is more like 4-5mm. However, when I place my 6' level on these offending areas that gap almost halves.

    Clearly the longer straight edge is highlighting the issue more, so I was wondering what is acceptable to tile onto or whether I should battle another couple of bags of SLC to try and bring the dipped area up again. God knows if I’ll fix it or cause more issues!

    Not sure if the dipped area will cause much tile rocking, but will it be visible when looking across the kitchen?

    Thoughts and ideas appreciated
     
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  3. blup

    blup

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    If it was my floor I'd lose the dips at the tile adhesive stage.

    Blup
     
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  4. Keithmac

    Keithmac

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    I got up to 20mm at some points in our kitchen. Used hand mix cement based tile adhesive (was a killer mixing it!).

    Suppose you have to weigh up pros and cons but at 10mm I'd happily level with correct tile adhesive as well.

    20170821_200941.jpg 20170824_225018.jpg 20170824_142338.jpg
     
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