Any ideas what to stick paving blocks with please?

I've got a block paved ramp from the front door done by a previous owner for a wheel chair
Seems as though it was extended a tad with thin blocks on bricks.
Two were off when I got the place and I cemented them on. They came off about 9mts later so I cemented them on again.

4yrs on and 3 have come off.
I chiseled out all the old cement, built it up where necessary and cemented them back on and they came off in a matter of weeks.

Love to remove the ramp because of the step and it's the wrong colour but that's going to costa lotta so sticking these back on is going to be necessary.


Thanks.

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Comments

  • grumbler
    grumbler Posts: 58,629
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    edited 9 January at 5:58PM
    What ratio cement/sand did you use?
    Anyway, I'm sure tile adhesive will stick better, but it shrinks a little, so can't be very thick.
  • stuart45
    stuart45 Posts: 3,822
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    Sand/cement is fine for the bed, but mix some SBR  and cement to prime the bottom of the pavers before you bed them.
  • Lorian
    Lorian Posts: 5,676
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    Stixall works well for this, but you need a gun to apply it. Been on offer on Amazon recently. Clear is best. If you do glue them it's only a thin layer so leave the mortar.
  • twopenny
    twopenny Posts: 5,308
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    Stuart, what is SBR?
    Grumbler I have no idea. I have ready mix of 3 different types. Most work fine. This is just exasperating and I did it while the bathroom was being installed in a heatwave (I haven't had one for 4yrs) so I'm vague on remembering anything at that time.

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  • stuart45
    stuart45 Posts: 3,822
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    twopenny said:
    Stuart, what is SBR?

    SBR has got a variety of uses, and one of them is for bond bridging paving slabs. It's helps bond the slabs to the mortar bed, especially at the edges where they are most likely to come loose.
  • twopenny
    twopenny Posts: 5,308
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    Thanks, I'll look into that.
    It's not going to happen soon as it's 2c here with a ne wind howling past so that gives me time to explore and to post all my problems with a view to getting them all solved when it stops raining/freezing :)

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  • MarvinDay
    MarvinDay Posts: 256
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    edited 10 January at 12:50AM
    I had a similar problem with edging pavers coming loose a couple of years ago and I stuck them down using this:
    https://www.wickes.co.uk/EVO-STIK-Sticks-Like-All-Weather-Clear-Adhesive---290ml/p/137680
    And two years later, they are still solid.

    You just have to make sure that any loose material is totally removed before sticking the pavers down.
  • FreeBear
    FreeBear Posts: 14,251
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    twopenny said: It's not going to happen soon as it's 2c here with a ne wind howling past so that gives me time to explore and to post all my problems with a view to getting them all solved when it stops raining/freezing :)
    https://www.everbuild.co.uk/products/building-supplies/pva-and-sbr-bonding/sikabond-sbr/ - Can be expensive when you just need a cupful and have to buy a 5l can..
    And you need to wait for things to warm up a bit. Cement and most other adhesives shouldn't be used when the temperature is below ~5°C. There is a real risk that any water trapped in the joint or adhesive will freeze. Frozen water expands, and will destroy the bond. So you need several days of warm(ish) weather (cement can take 28+ days to reach full strength).


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  • twopenny
    twopenny Posts: 5,308
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    A bit like me then.
    Brittle in the cold and take a long time to warm through.

    It's an inconvenient step at the best of times and north facing 
    But wickes I can get to on a 60 mile round trip and I need something else from there. Perhaps a day out in a warm car.

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  • stuart45
    stuart45 Posts: 3,822
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    Wickes sell SBR in I litre tubs. 
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