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Posted: Sun Sep 12, 2010 10:41 am
by Flair
Hi, my sub base consists of loose hardcore, 3 inches of crusher run, 2 inches of sharp sand and then between 70-100mm of cement.
My question is will 20mm thick sandstone flags be thick enough to drive a car on with the base I have made without them cracking?
Posted: Sun Sep 12, 2010 10:49 am
by Injured
Read the main site it will tell you what subbase you need. But 20mm flags are not really strong enough for a drive. If you must use them lay them on a concrete mix and make sure they are fully bedded.
Posted: Sun Sep 12, 2010 11:29 am
by GB_Groundworks
by 70-100mm of cement?
do you mean a proper cast in situ concrete slab of c20-c30 construction?
Posted: Sun Sep 12, 2010 1:44 pm
by Flair
Was going to use a 6:1 mix using sharp sand & cement mixed onsite.
Posted: Sun Sep 12, 2010 2:14 pm
by GB_Groundworks
how big is your driveway?
makes no sense to mix anything over a metre cubed onsite unless access is bad, ready mix or volumetric(barrow mix) better mix proper strength and cast all in one go rather than batching it in a mixer and at about £80/m for bought in its cheaper than mixing it yourself.
Posted: Sun Sep 12, 2010 2:52 pm
by Flair
Have an area of 56.4 sqm. So do they turn up & just pour it out? The driveway packs I have been looking at are put together using a number of different size pieces, would it not be a race against time before the concrete sets??
Posted: Sun Sep 12, 2010 5:36 pm
by GB_Groundworks
no as you lay a concrete slab first, and then bed your slabs/flags onto the concrete slab.
the concrete gives it strength to take the weight of the car, but indian stone ecpecially 22mm is not recommended for driveway use.
i'd spend a few hours reading the main site if i were you there is a wealth of information on there.
Posted: Sun Sep 12, 2010 7:18 pm
by Flair
Ok thanks 4 that, think I will try & find some 50mm sandstone rather than take the risk of cracking the flags with the car.
Posted: Sun Sep 12, 2010 8:32 pm
by Flair
Not alot of places do a 50mm sandstone, they are all 15mm - 40mm. Any stockest in the north west you know of?
Thanks in advance .