From Stair Baluster Repair · Step 3 of 5 · Video by This Old House

Showing 0:49–3:02 of the source video.
Once the damaged balusters are removed, prepare new wood stock for the replacement sections. Use a miter saw to accurately cut the wood to the required length for the new baluster bases or full baluster replacements. For optimal durability, especially for bases in contact with the ground or moisture, use pressure-treated material. After cutting, apply a generous coat of wood primer to all cut surfaces of the new wood, especially the ends. Back-priming helps seal the wood, protecting it from moisture intrusion and preventing future rot.
Goal: Prepare new wood components for installation
This project demonstrates how to assess and begin repairs on a rotted wooden porch railing, focusing on replacing damaged baluster bases. The process involves identifying rotten sections, removing compromised balusters, cutting new wood stock to size, and back-priming the new components to prevent future moisture damage. The repair aims to restore the structural integrity and aesthetic appeal of the porch railing.
Measure the length of the old baluster or the gap it occupied. Cut the new baluster to the exact size using a miter saw or handsaw. If the baluster has decorative elements or specific end profiles (e.g., tenons), replicate these on the new one using appropriate woodworking tools. Sand any rough edges smooth.
This project outlines the steps for repairing or replacing a broken stair baluster, ensuring the safety and aesthetic integrity of your staircase.
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