"Peter Dawson" wrote in message
...
It's probably been asked a 100 times already, but what mix should I made
of
agg/sand/cement for footings?
I'm building a conservatory with approx. 18 inch footings for the walls.
got
some 13m to do, and need to work out quantities (let alone costs!).
before anyone shouts, yes I do realise it's special (srpc) cement I
require.
thanks.
Peter.

http://www.pavingexpert.com/mortars.htm#mixos

There's an on-line calculator there too.