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Posted: Sun Apr 19, 2009 12:09 am
by Drpete
Im planning to take up some concrete slabs in the back garden and replace with stone slabs - york look-alikes. Will I need to redo the base? Or will the existing base probably be ok? - Its cinder or clinker I think, but there is some plant life and worms/ ants etc.
Id be grateful for advice.
Posted: Sun Apr 19, 2009 12:20 am
by lutonlagerlout
you wont know till you see it
if its fairly weed free and has settled as far as its going to you might be ok
but thats as a DIYer i would dig it out and put a new sub base in
extra cost of course
LLL 
Posted: Sun Apr 19, 2009 10:00 am
by Tony McC
In Cheshire, it's most likely to be boiler ash, and there was a time when all paving was laid over a bed of this stuff because it was plentiful, cheap and compacts really well.
Rake out any weeds or organic matter and you should be able to re-use it.
Posted: Sun Apr 19, 2009 3:20 pm
by Drpete
Yep that fits - bioler ash. Thanks for both answers. If it looks ok Ill put a 2in or so layer of sharp sand over and lay into this, would a weed killer help too?
Posted: Sun Apr 19, 2009 8:40 pm
by Tony McC
Be easier for DIYer to use a mortar mix, summat like 10:1 with a bit of moisture in it. See the Bedding Mixes page for further guidance.