wrote in message
...
On Saturday, July 19, 2008 8:26:39 PM UTC+1, sm_jamieson wrote:
Just putting in the hardcore (MOT 1) for my floor slab. 100mm required
(BCO agreed).
First floor slab I've done.
To what depth should I rake it out before compaction to end up with
100mm ?
In other words, how much should I expect it to compact ?
Thanks,
Simon.

Compaction factor is 1.3 so if your compacted volume is 1m3 you will need
to order 1.3m3 of loose hardcore

That post is getting on for 10 years old.