How to Replace a Deck Post | This Old House

Shoring up an old deck with new supports with This Old House general contractor Tom Silva. (See below for a shopping list and tools.)

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Tom Silva and Kevin O'Connor replaced several wooden 4x4 posts that were supporting an exterior deck. The posts, which were not pressure-treated, sat directly on top of concrete piers. They had completely rotted at the bottom due to moisture wicking up through the concrete. Before removing the old posts, Tom & Kevin installed temporary bracing using 2x4's and a sledge hammer. With the deck temporarily supported, they removed the old posts and installed new pressure-treated ones. They also installed a galvanized steel post base at the bottom of each post, eliminating direct contact with the concrete piers.

Shopping List for for Replacing a Deck Post:
- 2x4s, for making temporary posts
- pressure-treated 4x4s, used as posts
- pressure-treated 2x4s, to make diagonal braces
- metal post base and expansion anchor, used to secure the post to the pier
- 3-inch decking screws, used to attach diagonal bracing

Tools for Replacing a Deck Post:
- hammer
- reciprocating saw
- pry bar, for pulling nails
- hammer drill fitted with 1/2-inch-diameter masonry bit, used to bore anchor holes in concrete piers
- impact wrench, for tightening expansion anchors
- miter saw
- small sledgehammer
- impact driver

Resources:
Pressure-treated 4x4 posts are available in home centers and professional lumberyards.

The galvanized steel post bases were manufactured by Simpson Strong-Tie [https://www.strongtie.com/].

The wedge-type concrete anchors were manufactured by RED HEAD Anchoring Systems [http://www.itwredhead.com/].

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How to Replace a Deck Post | This Old House
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