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Posted: Mon Jun 04, 2012 9:35 pm
by jimlimestone
Hi all, I have just done my driveway in 20mm single size limestone angular chippings 4 inch deep on top of 4" scalping planings)subbase , these have whacked down to give a good flat surface , but my problem is our cars just sink down when setting off, I know now reading through the site that I have monumentally cocked up because this was a big job 240m2 and 40 ton of chippings , I was concentrating on good drainage in using a non binding gravel and thought the angular gravel would lock and pack down well but it wont as far as cars are concerned, my question is could i fix this by some how making it into a self binding gravel by adding grano dust or limestone fines etc , perhaps laying a crust over the top and whacking down or mixing the fines into the gravel just to make it less fluid , my soul has already been destroyed by this job and if i have to remove it all I think my poor excuse for a brain will fry itself. anyone any ideas or solutions , help Tony please. jim
Posted: Mon Jun 04, 2012 10:03 pm
by Pablo
adding a dressing of fines won't work. I'm afraid you're going to have to suck it up and remove more than half of it. The rest should be piled to one side whilst you top the base up then move it over and do the same then re dress and compact it.
Posted: Mon Jun 04, 2012 10:10 pm
by DNgroundworks
Aye what Pablo said, pull off to subbase, top up and put back 50mm ish...no more, then possibly grab the 20t excess away 
Posted: Mon Jun 04, 2012 10:59 pm
by jimlimestone
Pablo, DN groundworks, when you say top the base up, what with?
Posted: Tue Jun 05, 2012 12:29 am
by seanandruby
Your single size chippings would of been more suited under permeable block paving. Think the guy's are telling you to top up with dtp1' or crush and run, 4inch of 20 ml is far to deep.
Posted: Tue Jun 05, 2012 1:50 am
by mickg
100mm of 20mm limestone is too much depth which is why your having problems
you need to remove the 100mm of 20mm limestone from the driveway and add 50mm more MOT type 1 sub base on top of the existing sub base and compact, then put back no more than 50mm of the 20mm lime stone and compact - there is no easier way I'm afraid
Posted: Tue Jun 05, 2012 2:43 pm
by DNgroundworks
Ambient of here may be of help to you, he operates in the Bolton area and has diggers and small wagons i think....
Posted: Wed Jun 06, 2012 8:49 pm
by jimlimestone
Thanks for the suggestions chaps , I will do whats been said , I do have a digger and tractor and trailer so should only take a weekend and a few buckets of sweat, cheers jim
Posted: Wed Jun 06, 2012 9:51 pm
by DNgroundworks
No need for sweat if your on a digger 
unless its an ancient hymac 