Quick Answer
Setting pole barn posts correctly is critical for structural integrity. Posts should be 3-4 feet deep (below frost line in most areas), properly braced during installation, and set in concrete or gravel. Use 6x6 pressure-treated lumber rated UC-4B for ground contact. Proper post setting prevents leaning, settling, and structural failure.
Step-by-Step Post Installation
- Mark locations - Use batter boards and string lines
- Dig holes - 12-18" diameter, 3-4' deep
- Add gravel - 6" of gravel in bottom for drainage
- Set posts - Place in hole, check plumb
- Brace - Temporarily brace to hold plumb
- Concrete - Pour concrete around posts
- Check alignment - Verify all posts plumb and aligned
Common Questions
Q: How deep should posts be?
A> Minimum 3-4 feet. Below local frost line required - check local code.
Q: Should I use Sonotubes?
A> Optional but recommended. Creates formed concrete pier. Adds $15-25 per post.
Sources
- NFBA, "Post Installation Guide"
- Simpson Strong-Tie, "Post Embedment"