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The main cause of a rotting porch post is prolonged exposure to moisture. So, the best way to prevent rot is to eliminate and guard against moisture.

• Use wood caulk to seal any cracks, openings, or areas along the post where water is likely to pool.

• Secure porch posts into concrete, if possible.

• Cover wooden posts with protective sleeves or wraps, often made of vinyl.

• Install metal post anchors for extra support.

Lattice should not touch the ground, as it creates a possibility for rot and a termite infestation. It’s best to leave a gap of 3 or 4 inches at the bottom for airflow and to keep the wood dry. You can add stones, bricks, or other decorative pieces to conceal the bottom of the lattice if desired.

Any wood deck provides some ventilation to the area below, as is the nature of that type of deck design. However, areas that experience excessive humidity and associated moisture benefit greatly from a dedicated ventilation system in the form of strip vents. This addition helps the various wood boards contract and expand evenly throughout the years and reduces the chances of twisting, warping, and buckling.

No, you don’t need a permit to repair and replace a few boards on an existing deck. However, if you’re making structural changes to the deck or tearing down the old one and building a new one, you will likely need a permit. Check with your local municipality for the regulations and rules in your area, or ask a local contractor who builds decks for advice.