I Have Wood Rot on My Siding? What to Do?

Wood rot on siding can be a common issue, especially in areas with high moisture levels or where the wood is exposed to the elements. If you’ve identified wood rot on your siding, it’s essential to address it promptly to prevent further damage and potential structural issues. Here’s what you can do to fix wood rot on your siding:

1. Assess the Extent of Damage:

  • Begin by inspecting the affected area to determine the extent of the wood rot. Look for signs of decay, such as soft or crumbly wood, discoloration, or areas that appear swollen or warped. Identify any areas where the wood has rotted completely through.

2. Remove Rotted Wood:

  • Once you’ve assessed the damage, carefully remove any rotted or decayed wood from the siding. Use a utility knife, chisel, or pry bar to cut away the affected wood, being careful not to damage surrounding areas. Remove any loose or decayed material until you reach solid, healthy wood.

3. Treat the Area:

  • After removing the rotted wood, treat the remaining wood with a wood preservative or fungicide to prevent further decay. Apply the treatment according to the manufacturer’s instructions, ensuring complete coverage of the affected area.

4. Repair or Replace Siding:

  • Depending on the severity of the damage, you may need to repair or replace the affected siding. For minor damage, you can fill in any gaps or holes with wood filler or epoxy filler, sanding the area smooth once it’s dry. For more extensive damage, you may need to replace entire sections of siding. Cut new pieces of siding to size and install them according to the manufacturer’s instructions.

5. Seal and Protect:

  • Once the repairs are complete, seal the newly repaired or replaced siding with a high-quality exterior paint or stain to protect it from moisture and weather damage. Apply multiple coats as needed for adequate coverage and durability.

6. Prevent Future Damage:

  • To prevent wood rot from recurring, take steps to minimize moisture exposure and promote proper ventilation around your home. Ensure that gutters and downspouts are clear and functioning correctly, and that water is directed away from the foundation. Trim back vegetation and foliage that may be in contact with the siding, and regularly inspect and maintain your siding to catch any issues early.

If you’re not comfortable tackling wood rot repair on your own or if the damage is extensive, it’s best to hire a professional contractor who specializes in siding repair and replacement. A qualified contractor will have the expertise, tools, and materials needed to assess the damage accurately and make the necessary repairs efficiently.

As for the cost of repairing wood rot on siding, it can vary depending on the extent of the damage, the type of siding material, and the labor involved. Minor repairs may cost a few hundred dollars, while more extensive repairs or siding replacement can range from several hundred to several thousand dollars. It’s best to obtain multiple quotes from reputable contractors in your area to get an accurate estimate for your specific project.


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