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Fixing Rot on Wooden Windows

Construction How-To, Remodeling, Windows & Doors May 14, 2014 Sonia


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An oscillating multi-tool like this Bosch Multi-X is a great gadget for cutting out damaged wood.

Surgical Replacement

In some cases, the best solution may be to cut out the damaged section of wood, carefully cut a replacement of piece pressure-treated wood to the same shape and dimensions, and glue the piece into the window casing with a high-quality, exterior-grade adhesive that accepts paint. Solid PVC stock is an even more durable material than PT wood, although it can be difficult to find in some areas.

I used PL FIX to help harden the casing around the repair and to help fill seems at the joint.

I used PL FIX to help harden the casing around the repair and to help fill seems at the joint.

For extra moisture protection, coat all sides of the wood replacement piece with exterior primer/paint before installing.

For extra moisture protection, coat all sides of the wood replacement piece with exterior primer/paint before installing.

We’ve found that an oscillating multi-tool equipped with a plunge blade is an excellent device for cutting out the problem area. Remove all loose wood, dust and debris. We also recommend coating all sides of the replacement piece—plus the damaged area—with exterior primer before fastening in place, to add an extra measure of moisture protection. After gluing and nailing or screwing in the replacement piece, fill the seams with exterior-grade wood putty and sand the joints smooth. Apply paint-able waterproof sealant, primer and matching paint to complete the repair. Visit www.extremehowto.com.

All repairs should be caulked, primed and painted to match the existing casing.

All repairs should be caulked, primed and painted to match the existing casing.

Glue and/or nail the replacement carefully into the void. Use an exterior-grade wood glue or construction adhesive.

Glue and/or nail the replacement carefully into the void. Use an exterior-grade wood glue or construction adhesive.

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