This deck was a disaster waiting to happen. The structural integrity of the hangers and fasteners was compromised.

If a joist is compromised, it can be the source of a squeak. Install Joist Hangers: Use joist hangers to secure the end of each joist where it meets the frame, creating a more stable flooring system.

Replace the old post with pressure-treated wood. "Posts should not rot if you're using properly treated pine," Reeder says.