Pier footing depth - how deep?
Hi all,
I’ve been given the go ahead by the aesthetic committee to install a pier in my front yard. I have the pier in mind but I was wondering how deep I would need to go for the concrete base. I’ll be using it for astrophotography and it will hold a SW AZEQ6 mount, and a SW Esprit 100 (with all the bits attached).
The problem I face is my house on Sydneys north shore sits on a heap of sandstone. There’s sandstone all over the place. In fact you don’t have to go that far into the ground to strike a huge block of it. I’m not that keen to be drilling into sandstone.
So I was wondering what is the minimum depth I could get away with so the pier is stable enough for astrophotography.
Rene
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