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Posted: Sun Sep 20, 2015 1:48 pm
by harrisons6
hi to everyone. i have brought some granite paving from nustone its 20mm thick i am about to lay it but decide to do some reading on granite first. i have read that there are a few issues with laying it more so because it is 20mm. i am told i could get staining on the top of slab because it draws up from the underneath. if this is so could i treat the granite with neat sbr to prevent this happening if so should i let it dry first or lay when wet. the base is prepared in a proper manner, slabs will be laid in mortar mix on top of sharp sand, with a 5mm gap. i have laid paving before but never granite, thanks in advance. peter
Posted: Mon Sep 21, 2015 5:38 pm
by harrisons6
hi again is this just a dumb question I have asked? or does nobody know the answer. don't intend being rude but would just like to know either way. thanks peter:(
Posted: Mon Sep 21, 2015 9:16 pm
by mickg
yes its advisable to SBR the rear side of granite prior to laying
PS... we work for a living during the day and answer questions in our spare time 
Posted: Mon Sep 21, 2015 10:29 pm
by harrisons6
thanks for that mickg no offence was intended I just thought maybe I had asked a stupid question . would I let it dry first or use when still wet, thanks again peter
Posted: Mon Sep 21, 2015 10:36 pm
by mickg
we apply it to the rear side and lay the paving onto the concrete bed straight away, make sure you have a bucket of clean water and brush by your side to remove any SBR what may get onto the surface of the granite as once its dried its virtually impossible to remove it
non taken
we laid this granite patio a few years ago
granite patio
Posted: Mon Sep 21, 2015 10:43 pm
by harrisons6
thanks again mickg. that's a great looking job. peter
Posted: Tue Sep 22, 2015 7:19 am
by lemoncurd1702
Mick, do you literally apply the sbr straight from the tin or do you make a slurry with it?
Posted: Tue Sep 22, 2015 7:25 am
by mickg
pour the SBR into a bucket and brush it onto the rear of the paving
Posted: Tue Sep 22, 2015 3:20 pm
by harrisons6
could I also ask I have 20mm granite 600x900, 600x600, 600x300, and 300x300.
do they break very easily when tapping down, I will be using a rubber maul. and do you dilute the sbr at all. thanks peter
Posted: Tue Sep 22, 2015 9:17 pm
by mickg
no they are very hard to break and you should have no problems using a rubber maul, but this will depend on the bedding mixture, if its too dry and you continue to tap into position due to having the bed to high then it will become very rigid and you could break a flag so proceed with caution and common sense
SBR has the consistency of milk so does not require diluting
Posted: Tue Sep 22, 2015 10:33 pm
by harrisons6
thanks again mickg for your help on this it has put my mind at ease about laying the granite. I have taken delivery of slabs today and they look really good, I also had the sharp sand delivered today. there`s skip in the front drive, base prepared so all ready to go next week all I need now is a week of decent weather. now you have given me this help I feel more confident about the project and looking forward to it so again thank you.. peter