Does a concrete bas...
 

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[Closed] Does a concrete base need mesh to re enforce ?

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Following on from a post I posted at the weekend re driveways

Does a 4 inch sub base made from concrete need to be reenforced with mesh etc ? Sand and paving blocks laid on top.
Under concrete will be 6 inch type 1

I know I could ask on another forum but over here in singletrack world things move a little faster !


 
Posted : 29/09/2014 11:26 am
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No


 
Posted : 29/09/2014 11:29 am
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If your using it as a sub base slab under block paving then no, not really. Just make sure your Type one is fully compacted.


 
Posted : 29/09/2014 11:29 am
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Any weight going on it?

Only ask like cos' I did the Farm's driveway (small carport) with concrete and paving slabs and I stuck some old pig iron and scrap in the concrete to add strength, then put the slabs on top.
It's been fine and TBH I always thought you had to stick something in the c'rete to stop it cracking/fracking..


 
Posted : 29/09/2014 11:36 am
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"Does a 4 inch sub base made from concrete need to be reenforced with mesh etc ? Sand and paving blocks laid on top.
Under concrete will be 6 inch type 1"

what are you parking on this ? the space shuttle ? or is this the drive way to footflaps shed?


 
Posted : 29/09/2014 11:47 am
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As above .... probably not necessary but I layer near the top would prevent any unwanted cracking in the slab if you're applying substantial load to it (e.g. a car)


 
Posted : 29/09/2014 11:48 am
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Concrete is an expensive way of producing a sub base for paving blocks, see this website for some excellent advice on how to do it properly http://www.pavingexpert.com/subbase.htm

If you stick with the concrete, no it doesn't need any mesh and definitely doesn't need any pig iron...............


 
Posted : 29/09/2014 11:51 am
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or is this the drive way to footflaps shed?

Only 6"! I'd be pile driving down into the mantle before I thought about type 1....


 
Posted : 29/09/2014 11:52 am
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If its only for slabs - then I wouldn't even consider a concrete sub base, just a 10:1 dry mix and a resin grout.
Just make sure the Type 1 is very well whackered down.


 
Posted : 29/09/2014 12:17 pm
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"then I wouldn't even consider a concrete sub base, just a 10:1 dry mix and a resin grout.
Just make sure the Type 1 is very well whackered down."

this - ive laboured on some very big commercial block projects in my younger daysand never seen more than that done unless exceptional soil circumstances - the blocks are still in good fettle even 15 years later with no sinkage.


 
Posted : 29/09/2014 12:37 pm
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If its only for slabs - then I wouldn't even consider a concrete sub base
Another +1


 
Posted : 29/09/2014 12:38 pm
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Unless it's going to be subject to heavy trafficking, you won't need the concrete. It might actually cause you more issues, as water can sit in the sand layer and freeze in the winter, which can then make your blocks unstable.


 
Posted : 29/09/2014 12:48 pm
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10:1 dry mix

Agree with this. I've just been using that ratio and it's a doddle to work with. There was even time for lunch halfway through. And as above, check out pavingexpert.com - it's AJ McCormack's handywork so speaks for itself, really...

Edit : Having written that, if you're going to drive on it then it might be worth going for a slightly stronger mix. According to Mac [url= http://www.pavingexpert.com/layflag3.htm ]HERE[/url], a 10.1 mix is best for patios and foot traffic. Step it up a tad for a driveway.


 
Posted : 29/09/2014 1:52 pm
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nickjb - Member

If its only for slabs - then I wouldn't even consider a concrete sub base
Another +1

Wish I'd known that before I did the Farms carport 🙄


 
Posted : 29/09/2014 1:54 pm
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Wish I'd known that before I did the Farms carport
Well you live and learn. Don't beat yourself up too much. 😀


 
Posted : 29/09/2014 1:58 pm