How to Replace Floor Trusses

Access the space beneath the floor truss, either through a basement or a crawl space to locate the damaged truss.

Measure the length and width of the old truss with a tape measure and order a replacement truss of the same size.

Remove the floor truss that you’re replacing by cutting through the joint along the edge of the truss where it connects to the wall with a reciprocating saw containing a metal blade to cut through the nails.

Raise the new floor truss into position using a pole jack on either end to steady it against the subfloor above and against the bordering walls.

Nail the new truss in place using an 8d nail and hammer through both the top and bottom flange of the hoist and then through the center of the end block. If the floor joist overlaps an interior load bearing wall, then use multiple joists, butted end to end at the center of the wall. Nail the two trusses together by toe-nailing an 8d nail through the top of one truss and angled into the side of the top flange of the second truss. Nail the two to the top of the wall by driving an 8d nail through the bottom flanges of each truss into the top wall plate.