Any ideas what to stick paving blocks with please?

twopenny

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.

grumbler

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

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

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

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.

stuart45

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

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

MarvinDay

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

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).

twopenny

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.

stuart45

Wickes sell SBR in I litre tubs.