Page 1 of 1
Posted: Wed May 27, 2015 10:58 pm
by DIYER
I have recently had excavated and laid a new drive. I found paving expert a great site for useful information, so thank you so much.
As a result of the excavation the builders decided to dress the borders with the chalky waste.
I'm considering laying a a large concrete slab in the garden and was wondering if i could use the chalk stones to either create a hardcore base or as ballast for the concrete.
The pad will need to support a shed.
Many thanks
Posted: Thu May 28, 2015 4:39 pm
by lutonlagerlout
chalk is good for lowering the acidity of soil,famers used to use it
not much kop for building with though
dressing borders?
LLL
Posted: Fri May 29, 2015 5:44 pm
by seanandruby
Living in East Sussex we obviously have to build on chalk. I have used it under slabs as a capping layer with a concrete blinding on top about 50ml. read this
Posted: Fri May 29, 2015 7:24 pm
by lutonlagerlout
I think the key is that the chalk there is graded Sean
we are on chalk too but it doesnt come out in rocks,more a kind of powdery goo with lots of flints in it
never seen it used in these parts as subbase
we used to buy flint rejects from a chalk quarry in the 80's
£5 a yard 
LLL
Posted: Sat May 30, 2015 9:10 am
by local patios and driveway
farmers like chalk because its good for cow hoofs.
Posted: Sat May 30, 2015 12:03 pm
by seanandruby
They build houses using chalk. Chalk cob houses. Diyer what type of chalk do you have? Photo be good ( bet it's white )
Posted: Thu Jun 04, 2015 1:59 pm
by Captain Concrete
You can build a slab on chalk providing its well compacted, like Sean says its best not to pour straight on to the chalk. Either use some blinding or membrane to cover formation before pour. Chalk is good to work with until it rains then it turns to SLOP.