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You can buy premixed ballast in small 25kg bags or half tonne bags or one tonne bags.Just add cement and water.

To calculate amount you need multiply length x width x depth,sq m of concrete.

Merchant can then tell you how much ballast you need.

 

Hope that helps

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Cheers guys, my new runs will be 5.2 x 2.1 m . Will the ballast go solid enough that it's not goin to start flaking or crumbling after a year or two ?

 

At 100mm thick, or 4 inch, that size comes out at 1.1 cubic meters, a couple of bulk bags should do it. Get a batten set up so you can give all of it a good troweling up, don't leave any cracks for water to get in or it will break up eventually. 4 and a half black buckets of ballast, to half a bag of cement is a fair mix for paths/runs.

Edited by Truther
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