How to Add Strength to Wood Trusses

What You'll Need
Wood screws

Over time, heavy loads and dry rot can weaken wood trusses. Strengthening a wood truss is possible with the right tools and materials. This home improvement project will take about 2 hours to complete.

Step 1 – Measuring the Truss

Use a tape measure to determine the length of the damaged area and the width of the truss that has become weak. The width of the truss will most likely be either 3½ inches or 5½ inches. Add 12inches to the length of the truss to determine the measurement you will use.

Step 2 – Cutting the Support Board

Use your saw to cut a piece of plywood to support your truss. Use plywood that is ¾-inch thick. Use the width and length measurements you have determined to cut the piece. Cut a second piece the same size as the first one.

Step 3 – Securing the Support Board

Secure the support boards to both sides of the weakened truss. Use wood glue to secure the support board to the truss. Use your C-clamps to secure the support board. Secure 3-inch wood screws through the plywood and into the truss. Be sure to keep the screws away from the most weakened area.