The frost line is 1.2m deep in my area. That seems like a lot of concrete to pour for a fence post.
I'm wondering if a better way is to make a shorter footer following the suggestion that's used in wooden posts shown below, but with concrete footers:
Digging a hole like this seems tricky, so a concrete form seems like a better way. I found a patent for this kind of forms, but don't know where they can be purchased.
So, my questions:
- Would a shallower conical post resolve the issue of frost heaving?
- If so, how shallow? Wind load is a factor, so assuming a 2m high privacy fence, perhaps all of this is moot.
- Where can one buy conical forms?