Hi Tony
When laying a sub base of scalpings 100mm thick how much will it compact under several runs of a 'wacker'. Your 'excellent' calculators tell you, you need x tons at 100mm compacted but how thick should you rake it to prior to compaction.
In my case the scalpings are laid ontop of compacted brick rubble
Thanks
Subase
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84-1093879891
There's no set figure - you can't say that 150mm of 'sub-base material' will always compact to 100mm thick, as the moisture content, type of stone (or other material), size/weight/efficiency of compaction equipment, all have an effect on compaction, but, very generally speaking, 130-150mm will compact down to 100mm.
HTH
HTH