This fence was built with 2 3/8" schedule 40 posts. The fence boards are cedar and in the process of intentionally greying.
Steel Schedule 40 posts are pounded 4' into the ground, eliminating the action of frost on a concrete pile as well as eliminating the need for messy and expensive digging and use of concrete. Fence can be built in one day without having to wait for concrete to cure. Galvanized steel posts will not rot.
Special steel-wood adapters are used to attach wooden horizontal stringers to the steel posts.