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Posted: Fri Sep 12, 2014 11:37 am
by chequers
Hi All
Ok got the sub base sorted and can see that it is to be sharp sand 6 to 1 mix on the sub base but i have a lot of slabs to lay on steps which are constructed from blockwork so should i then change to buildling sand which would give better adhesion to the slab? (stickier)
Posted: Fri Sep 12, 2014 5:12 pm
by lutonlagerlout
no just knock the mix up wetter and add SBR to the mix
also prime the blocks with SBR
cheers LLL
Posted: Sat Sep 13, 2014 11:14 am
by chequers
Hi
Okay our sharp sand is in fact building sand its all that is available in this area so i will have to go with it
What does the sbr do and should the underside of tbe slabs be treated with sbr when laying on the patio?
Thanks
Posted: Sat Sep 13, 2014 2:57 pm
by mickg
yes we coat the back side of the paving with SBR as well as adding it to the mix
SBR stops the efflorescence from leeching through the paving and showing on the surface as white staining plus it acts as an adhesive, be very careful using the SBR and have a bucket of clean water and a brush to hand at all times because if it gets onto the surface of your paving you can't remove it
Posted: Sat Sep 13, 2014 11:41 pm
by lutonlagerlout
chequers wrote:Hi
Okay our sharp sand is in fact building sand its all that is available in this area
what area is that then?
sounds like someone is talking total bollox to you
sharp sand is available everywhere
LLL
Posted: Sun Sep 14, 2014 11:25 am
by chequers
South west Wales
options are plastering /building sand or top coat finer sand , tried all the merchants and aggregate supplies
no choice but to go with plastering/ building sand
Posted: Sun Sep 14, 2014 6:36 pm
by r896neo
plastering sand and building sand are not the same, plastering is much coarser and would be better for laying your paving on.
Posted: Mon Sep 15, 2014 3:51 pm
by chequers
I didnt think it would be this hard to order sand
I have found after phoning around one merchant who has what is described as coarse grit sand 6 to 8 mm used for concreting and floor screeding
I quoted the ref on this website re class m etc and he didnt have a clue what i was talking about
Guess this is the right one ?
Posted: Mon Sep 15, 2014 7:24 pm
by msh paving
That will be fine...MSH 
Posted: Mon Sep 15, 2014 7:25 pm
by lutonlagerlout
yes!
the sand used for floor screeding
AKA
grit sand
screeding sand
flooring sand
river wash sand
class M sand
sharp sand
every merchant calls it something different
ideally it has bits of grit in it,
6-8 mm sounds a very odd size
everywhere in the uk stocks screeding sand which is what you want
cheers LLL