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We have a number of "slabs" that are just wider than a brick, which are set on top of walls in the garden. A number of them have come lose and I need to remove the cement mix that used to hold them down and set them again.

What mix of cement and sand should I use, and are there other things I should mix in to ensure the mortar has a good "grip" on the stone that sits on top of the wall?

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Construction adhesive works well. –  Tester101 Jul 29 '10 at 1:04
    
Would "Construction Adhesive" be available in a hardware store (in the UK I'm thinking Wickes, Jewsons, B&Q)? Is it something that's added to the cement and sand mix? –  Bernhard Hofmann Jul 29 '10 at 5:56
    
I'm not sure what is available in the UK, in the states it would be Liquid Nails, or a construction adhesive from DAP. This is not mixed with the cement, it is used to glue the top cap to the wall. –  Tester101 Aug 16 '10 at 12:16
    
Could you add that as an answer rather than a comment so I can accept it as the answer. Otherwise I'll add it myself but you should get the rep points for answering it. –  Bernhard Hofmann Aug 17 '10 at 8:54
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you could use a Construction adhesive like Liquid Nails or Beats the Nail. This works well for cap stones, since they are usually not a structural part of the wall.

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