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Posted: Tue Aug 19, 2014 7:57 pm
by Woppy69
Hi all, I have broken up a old concrete drive and removed the concrete. What depth should I excavate to underneath?The ground is hard and has rubble underneath and road plannings. Seems very solid.
Best wishes
David
Posted: Tue Aug 19, 2014 9:24 pm
by seanandruby
Are the planings coated in bitumen, or clean, are they a uniform size say 40ml? Could be you might get away with leaving them in if they are clean.
Posted: Tue Aug 19, 2014 9:39 pm
by Woppy69
Clean road plannings all about the same size, not very deep though but firm. Could u run the wacker plate over it to help?
Posted: Wed Aug 20, 2014 7:27 am
by seanandruby
If it's been down a while with a concrete slab on top it should bé as compact as it will ever bé. But if you have a wacker it won't hurt to give it a thumping. Clean planings is good to go then.
As long as you have 100 to 150 sub base down, DTP1 or as good as.