On Thu, 06 Aug 2015 19:56:32 +0100, john west
wrote:

Have some paving slabs forming a few steps on a patio.

The slabs have a couple of inches of overhang (which i know they should
not have) so when people walk on the very edge, after a while the slabs
tip up and become loose.

I could try cementing them down again, but wonder if i could use
something that would be more adhesive than cement? Any suggestions?

I had this problem, question posed here some months back, and was
told to try SBR added to cement mortar, both surfaces washed with a
cement SBR "primer" and then mortared with 3:1 sand:cement mix with
SBR. Still holding so far.

AJH