Lateral Brace For Wood Floor Trusses

Even if your joists already have a row of bridging at the center of the span adding a row on each side of the existing bridging will stiffen the floor.

Lateral brace for wood floor trusses.

The number of trusses clustered depends on building span and truss spacing. Metal plate connected wood trusses hib 91 by permission of truss plate institute inc. Long slender web members that resist compression force must very often be braced. Wood truss restraint and bracing guide overall truss length 1 maximum spacing up to 30 10 on center 30 45 8 on center 45 60 6 on center 60 80 2 4 on center 1.

On bottom chord bearing trusses the ends are tied together with 2x4 ledgers that also serve as a nailing base for the perimeter of the plywood deck see illustration below. Bridging or x bracing allows joists to share weight. Install top chord diagonal bracing and web member diagonal bracing to form triangles perpendicular to the plane of the truss. Wind bracing should be placed at 30 60 angles.

Substituting t braces for continuous lateral braces on wood truss webs w t figure 1. Truss diagrams generally show the locations where bracing is required. The overall truss length refers to the overall length of the truss including cantilevers exclusive of overhangs. The truss designer identifies the location of required individual truss member i e web top chord or bottom chord restraint bracing.

As a footstep falls on one joist some of the force is transferred to neighboring joists. Elements of continuous lateral bracing for webs in a roof system. If the truss bundle is to be stored for more. The report states simpson strong tie bridging components described in this report are used to provide lateral support for wood joists sawn lumber and prefabricated wood i joists in accordance with section 2308 8 5 of the ibc and section r502 7 1 of the irc.

This bracing serves the purpose of preventing out of plane buckling due to the applied loads shown on the truss design drawing. Lateral bracing for truss web members is generally the key problem. With floor trusses bracing becomes a permanent part of the floor structure. Correct installation of a 2x4 t brace on a web as assumed in the development of tables 1a 1b 1c and 1d.

If trusses are stored horizontally the blocking should be eight to ten foot centers to prevent lateral bending. Individual truss member lateral restraint and diagonal bracing. 4 storage trusses should be stored in a stable position to prevent toppling and or shifting. Wind bracing truss clusters at both gable ends and at least every 20 add wind bracing green for truss clusters.

Hold these restraints in place with two nails each. Use wooden 2x4 or prefabricated metal braces as short member temporary lateral restraints between the trusses. Bracing prevents trusses from bending twisting or otherwise deforming.