Why your deck posts rot and how to replace them safely
In short: General contractor Tom Silva demonstrates how to replace rotted deck posts. By installing temporary bracing and using modern hardware, you can prevent moisture damage and ensure your deck remains structurally sound.
Wooden posts that sit directly on concrete piers are prone to rot because moisture wicks upward into the wood. In this demonstration, Tom Silva and Kevin O'Connor address this issue by replacing non-pressure-treated 4x4 posts that had failed due to this exact process.
The repair involves installing temporary 2x4 bracing to support the deck before removing the damaged posts. The team then installs new pressure-treated 4x4 posts, securing them with galvanized steel post bases and expansion anchors to eliminate direct contact with the concrete piers.
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Sources
- Summary by Intellect · source: How to Replace a Deck Post | This Old House
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