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.

Put a nominal 125m and whack down - it will go down about an inch, depending
on moisture content, the wetter it is, the tighter it packs down, although
it does make a bit of a mess, it makes for a better job, but saying that,
under a floor slab, it isn't really that important - under a drive, it is.