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Posted: Wed Apr 13, 2011 8:17 pm
by Wideboy
We plan to use either slate or limestone for our patio as they are not as porous as sandstone do the backs need buttering to make them adhere better to bedding layer or is there an additive you can add to the mix to improve adhesion and do away with buttering the backs?Also what is the best ratio for the mortar I have seen suggested everything from 6to1 to 3to1 for slate your thoughts please guys.
Cheers wideboy(Ian)
Posted: Fri Apr 15, 2011 10:27 pm
by London Stone Paving
Ian
1. With the limestone there is no need to butter the underside of the slabs. I would go for a 4 or 5 parts sharp sand to 1 part cement
2. Slate is a bit different. The slabs need to be buttered on the u/s with sbr/ cement slurry (I think thats correct. If not I will be corrected fairly quickly). I would also go for a slightly stronger mix of compo. 3 or 4 parts sharp sand to 1 part cement. Also make the mix a little bit wettter. Not too much just a bit beyond tacky.
Cheers
Steve
Posted: Sat Apr 16, 2011 8:16 am
by GB_Groundworks
Yep A london says gets some sbr or syrup butane rubber acts as a bond intensiver or bond bridge and prime the back of your slabs, can also add it to your mix to make them stick like scheeeet
Posted: Sat Apr 16, 2011 12:36 pm
by cookiewales
GB_Groundworks wrote:Yep A london says gets some sbr or syrup butane rubber acts as a bond intensiver or bond bridge and prime the back of your slabs, can also add it to your mix to make them stick like scheeeet
all the right answers there boyos 
Posted: Thu Apr 21, 2011 9:33 am
by Turbina Magnum
When lads say 6:1, 3:1 etc they mean ratio of weight - I would like to see how people are weighting the sand and then cement
For limestone or granite patio I would just use 10 shovels of sand and half a bag of cement mixed.
If slabs are less then 40mm thick and you be using area quite havely, just buy a bag of white cement (5 euro) and mix in bucket pure cement with water to get it like glue and stick that on back of slab.
not expensive and good
Posted: Thu Apr 21, 2011 11:24 am
by London Stone Paving
Why are you talking in Euro's Turbina?
Posted: Thu Apr 21, 2011 12:52 pm
by Turbina Magnum
thats currency I am used to :;):
but i`d say bag of white cement in london isn`t more than 5 pounds?
bit off topic 
Posted: Thu Apr 21, 2011 5:51 pm
by lutonlagerlout
London Stone Paving wrote:Why are you talking in Euro's Turbina?
plural of euro is euro steve
no such thing as euros :;):
turbina is from the emerald isle althouigh i thought he might be a spammer when i first saw that unusual name
what county are you from turbina?
LLL