> I'm going to be building a pergola out back and I might need to hang
> from some of the posts.
> So if I'm going to be burying a 4X4 post and filling with concrete,
> will anything over a foot be plenty strong? The posts aren't going to
> have to hold much weight in the way of lumber, so it's just the
> strength for hammocking that I'm concerned about.
> Any other advice?
It depends a little on the type of "soil". Here in the South with red clay
to work with, a foot and concrete would be a bit shallow for hanging a
hammock. Unless, you are hanging the hammock from inter-linked posts. Then
a foot of depth might work O.K. Structure design is a key factor. As to
hanging a hammock, over engineering is better.