Roof Truss Lateral Support

Workshops warehouses industrial buildings etc.

Roof truss lateral support. Permanent bracing listed on the truss design drawing for specific web members and permanent bracing for the roof or floor system. This condition generally applies when trusses are spaced at 2 feet. A line of continuous structural members to a chord or web member of a truss to reduce the laterally unsupported length of the truss member. Roof trusses become necessary when sloping roofs have to be provided.

Certain truss members require bracing in order to carry the full design load. At places of heavy rainfall or heavy snowfall sloping roofs are necessary which have to be supported by roof trusses. At both gable ends and at least every 20 add wind bracing green for truss clusters. Part of a truss that extends beyond its support exclusive of overhang.

Wind bracing should be placed at 30 60 angles. Extra support for the trusses can be made by placing a 2 by 4 inch piece of lumber from each truss on one side to the truss on the other side high enough to provide head room but low enough to provide support for the trusses. When truss spacing exceeds 2 feet purlins are generally required to support roof sheathing. The images below show these critical components and their recommended placement.

In this situation the walls of a finished attic space or room would go with the roof line. There are two separate types of bracing to be concerned about. Continuous lateral bracing or restraint is very important. Continuous lateral brace clr.

The number of trusses clustered depends on building span and truss spacing.