|
I would go bigger than that Ian, if you are planning on putting a 14" newt on top of the gem. Like Barry mentions, depends on soil type etc. Deep loam/clay soils with lots of expansion/contraction would be the worst and would require a larger footing.
If you make up a cage with some scape steel with the threaded rod like you are intending to do, I don`t think any other reinforcing would be necessary. I would go 700 x 700 x 700mm at least.
My footing now is 500 sq and is very solid for the 8" scope.
cheers Gary
|