Aggregates for permeable driveway

All forms of block paving, brick paving, flexible or rigid, concrete or clays, new construction or renovation
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JT101
Posts: 9
Joined: Thu Jul 02, 2015 3:00 pm
Location: Bromley

Post: # 108111Post JT101

trying to find suitable aggregates for my permeable driveway but I think terminology is clouding the issue.

From the pages on the Paving Expert site, it seems I need 5-20 or 4-40mm Type 3 (DTp3) for the sub-base and 2-6mm grit for both the bedding layer and jointing fill.

been calling round a few builders yards and they clearly are not familiar with this, especially the concept of permeable driveways.

One guy told me he had Type 1 which he said is the same as Type 3. Clearly it's not.
And as far as the grit goes the closest thing I can find to the correct size is Horticultural Grit. Obviously being horticultural obviously it's expensive. About £100 / bulk bag. I've always found that garden centres charge twice as much for the same thing that builders yards supply, but it's under a different name.

So what I'm asking for is some help on indentifying the correct name for the stuff so I can do a good internet search and some names of builders merchants near SE London who supply the above.

Many thanks

lemoncurd1702
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Post: # 108119Post lemoncurd1702

The last one I did was specified as 20-6mm for the base and 6-3mm bedding. I think if thereabout should be ok. 40mm would be for the commercial jobs.

Try one of the larger national merchants, there should be someone there, or someone who knows someone who can help. A local aggregate merchant should also be able to help.

Should be aiming around £30/T plus haulage.
Wouldn't chance the horti stuff it may have organic material in it.
Cheers
Lemoncurd

rxbren
Posts: 394
Joined: Thu Jan 05, 2012 11:41 am
Location: northampton

Post: # 108128Post rxbren

Personally id just go for standard block paving with decent linear drains and suitable soakaway fair enough the Marshalls video with he dumper full of water looks good but you need alot more aggregate that costs more per ton, ground that's suitable, more muckaway, plus after a few years those nice wide spaces between the blocks gunk up with crap plus the blocks are nearly twice the price per m2

msh paving
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Post: # 108133Post msh paving

builders merchants is not the idea place to buy stone, you need to go direct to the quarry or supplier, i never buy sand or type1 from builders merchant , cant rember the last big bag i used to expensive MSH :)
paving, mini-crusher, mini-digger hire and groundwork
http://mshpaving.co.uk

JT101
Posts: 9
Joined: Thu Jul 02, 2015 3:00 pm
Location: Bromley

Post: # 108142Post JT101

I think I must have gotten into too much detail here with the grit sand. From this link here: , it suggests that "concreting Sand, sharp sand, grit sand, or coarse sand are suitable as a bedding material", which must apply to both permeable and non-permeable drives since they both lay on a bed of sub-base such as Type 1, 2 or 3.

In other words can't i just use sharp sand from my local builders merchant?

rxbren
Posts: 394
Joined: Thu Jan 05, 2012 11:41 am
Location: northampton

Post: # 108143Post rxbren

No cause it will eventually sink when all the fine bits of sand filter into the gaps below plus sand not free flowing water wise

JT101
Posts: 9
Joined: Thu Jul 02, 2015 3:00 pm
Location: Bromley

Post: # 108149Post JT101

Ok fine. I understand. Still on the hunt for this illusive grit.

lutonlagerlout
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Post: # 108150Post lutonlagerlout

lovedays stock all the stuff for permeable drives but as has been said the cost is prohibitive
much easer and better looking to use normal blocks and a soakaway with linear drains
LLL
"what,you want paying today??"

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rxbren
Posts: 394
Joined: Thu Jan 05, 2012 11:41 am
Location: northampton

Post: # 108161Post rxbren

Only ever done one permeable parking lot to be honest its more hassle than its worth have seen countless jobs on new build sites where he paving has bee finished and a skip wagon/delivery truck has gone over it and left tramlines a good 10mm plus where they went. The other thing as well is that the new builds have to allow for a 100 year life so end up having linear drains as a back up anyway to allow for future flooding issues

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