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Posted: Sun Sep 16, 2007 4:38 pm
by Andrthms4
started laying patio using bradstone natural slate using a bedding mix of 8-1(dust /cement),but found slabs laid on previous day coming loose or not bonding with the motar mix started using semi-dry then changed to a wetter mix to try and get more suction but no difference. may have to restart whole project.
any advice on how to get the mix to bond or stick better with underside of slab would be very much appreciated.
Posted: Sun Sep 16, 2007 4:45 pm
by Suggers
What surface are you laying onto?
Posted: Sun Sep 16, 2007 4:56 pm
by Andrthms4
laying it on whacked down sub base(scalping)
mix goes off great but doesnt bond or grip underside of slab(as if slab is too smooth) 
Posted: Sun Sep 16, 2007 5:42 pm
by seanandruby
try priming underside of slab with a unibond or, and a cementious slurry. use a semi-dry 8/10 to one for laying flags.
Posted: Wed Sep 19, 2007 3:10 pm
by Tony McC
For a patio, I wouldn't get too worried about the flags not "bonding" to the laying course. As long as they're not rocking, the pointing should hold them in place and prevent any lateral movement. However, you may want to use a wetter mix for those flags laid to any free edges.
Posted: Wed Sep 19, 2007 5:36 pm
by lutonlagerlout
if you havent pointed them ,then they will have a propensity to move laterally when walked on
like the gaffer says though ,rockers out
cheers LLL