"Keith (Dorset)" wrote in message
...
David,

Hi,

When we erected our greenhouse 10' x 8' (metal) greenhouse three years ago
we put down 9 inches of hardcore and 4 inches of concrete. That seemed to
be a general reccomendation.


That's what ours sits on too. I laid it in 1982, and until last year it was
used for parking a pickup truck on. It seems to support the greenhouse
equally well :-}

Steve