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Posted: Fri Feb 15, 2008 11:08 am
by Rick
I have 140sqm of Sandstone slabs to be laid.
One option I have been told is to use crushed glass instead of 4:1 screed.
Is this advisable, and do you then use the crushed glass as you would a 'sharp sand' layer, in which case assume it would need to be a 50mm layer ... or can you use it as the aggregate and mix with cement to use as a semi-dry screed ? and lay at 35mm
Posted: Fri Feb 15, 2008 5:10 pm
by lutonlagerlout
jesus h christ :O
have you bothered to read any of the main site?
the loon who told you to use crushed glass needs shooting
probably ok in the sub-base ,but type 1 would be cheaper and
easier to use
so its a NO from me
LLL
Posted: Fri Feb 15, 2008 6:27 pm
by Rick
lutonlagerlout wrote:jesus h christ :O
have you bothered to read any of the main site?
the loon who told you to use crushed glass needs shooting
probably ok in the sub-base ,but type 1 would be cheaper and
easier to use
so its a NO from me
LLL
Yes I had read the main site .. this is not me just using broken bottles, this is a company that supplies crushed glass as a sub base material for construction use.
I have not come across crushed glass previously, asked a few people ... and a couple have had it on their drives ... probably because of the local company that sells it.
One of the installers who quoted (Marshalls approved firm) were the ones who suggested that while they don't recommend it on drives, it could be used for slabbing the patio.
Posted: Fri Feb 15, 2008 6:51 pm
by flowjoe
Don`t know about sub base etc i`ll leave that to the experts, but it is being talked about as a pipe bedding material so maybe this is where the confusion has come from ?
Posted: Fri Feb 15, 2008 6:53 pm
by lutonlagerlout
One option I have been told is to use crushed glass instead of 4:1 screed.
who told you this rick?
problem is mate some folks have a vested interest in mugging you off if you dont know the score.
sub base is 100mm type 1 compacted,bedding course is 35-50 mm of 6:1 grit sand cement
point as you like
its like the various people who come on here after being sold road planings,they guys selling them is happy that he is getting some money for something that should be skipped or recycled,but they are not right for the job
btw how much do they want a tonne for the crushed glass?
LLL ???
Posted: Fri Feb 15, 2008 8:28 pm
by James.Q
i dont want to say this but good or bad reycled is our unfortunate future 
Posted: Fri Feb 15, 2008 11:44 pm
by lutonlagerlout
the OP asked about using it as a bedding layer for flags,which it is not intended for
it may work as a bedding layer for flexible paving but flags normally go on rigid construction,with a cementious bedding layer
didnt someone mention seashells a while back too?
LLL 
Posted: Sat Feb 16, 2008 9:21 am
by Dave_L
Could see it being used as pipe bedding but that's about it!
Posted: Mon Feb 18, 2008 1:37 pm
by Tony McC
At the moment, the only reliable source of crushed glass laying course material is Day's Aggregates in that London, and its use as a laying course for block paving seems to have been accepted, but I've not read anything about it being used as a laying course for flags, nor about it's use in a bedding mortar.
Personally, I'd stick with the tried-and-tested grit sand bedding mortar for patio projects.
Posted: Mon Feb 18, 2008 4:54 pm
by lutonlagerlout
still no news on the cost comparison?
i imagine glass to be fairly inert,but as with anything new theres a possibility that you may be 5 or 6 projects down the line before the problems become apparent £££ out
i cant see how it could be knocked up as it holds no water (or little) but no doubt we shall see
LLL
Posted: Mon Feb 18, 2008 6:25 pm
by Rick
I haven't priced it up yet .... I'll come back when I do.
Posted: Mon Feb 18, 2008 6:52 pm
by Tony McC
The bloke at Day's told me it should (allegedly) retail at around the same price as grit sand, which, I believe, is around 25 quid per tonne in that London
Posted: Tue Feb 19, 2008 10:39 am
by haggistini
we have been using crushed glass on a large commercial blockpaving project using mashals tumbled sets all winter, come rain or shine its been great a bit ichy tho! and it gets everywere but the rain does'nt seem to affect it as much as sharpsand and its greener ..now where's the keys for my chevy!
p.s. we are laying 35 to 40 m2 a day off york stone and its all on screed ......crushed glass your offit!!
