|
My 2 cents worth
I would also agree that there is no hard and fast rule, but.... each person has their own preference.
My experience is, with reactive clay soils in Bathurst was, I'm not digging any hole deep enough by hand. that being the case using a machine to dig a hole I ended up with about 1.5m by 1.2m by 1m deep, well and truly overkill.
Again, I wasn't mixing concrete by hand so the in-ground mass plus the above ground riser was about a local mini-mix load, to get less than a load would have meant paying a premium for nothing.
So my advice is, go with what you are comfortable with, even a .6 by .6 by .6 mass will weigh just over half a ton, but if it moves and you are unhappy, how much is that worth to you??
My 4.5 tons is never going to move and will never be dug out ( by me anyway ) but I made the decision to do it once, I would rather overkill than something I was less than happy with.
|