Roof Truss Rigid Ceiling Bracing

Bracing for roofs that are approximately square.

Roof truss rigid ceiling bracing.

In a roof truss design the additional web members of the truss help resist sagging of the bottom cord and add rigidity to the truss structure. Nail braces vertically every 4 feet along the top and bottom of a gable truss. Turn the truss upside down and place on corner on the roof surface. Wind or wall bracingthis bracing is installed in the roof in addition to the truss stability bracing and its purpose is to stabilise the gable walls under the action of wind loading.

Truss stability bracing this is permanent bracing which holds the trusses upright straight and prevents any out of plane buckling of the members. Bracing for putting up trusses as each truss is put up on top of opposite walls it must be put up straight and supported while the next truss is put up. Temporary truss bracing shall always be required. Diagonal rafter bracing should be approximately 45 to the rafters on plan.

It is best to brace the inside of the trusses before handling them. 8 alternate to purlin not mentioned in code. Brace nailed to each rafter braced rafters rafter span a provision that was carried over from the ubc and the old dwelling code is. However the weight of a ceiling affixed to rafter ties of any dimension can cause ceiling sagging unless the lumber is also sized to support the vertical load or weight of the ceiling.

The plasterboard should be a minimum thickness of 9 5mm for up to 450mm truss centres or 12 5mm for up to 600mm truss centres. See product data sheet no 3 for more information. Bracing for roofs less than 6 6m wide on detached or staggered stepped buildings. Where a ceiling is less rigid than plasterboard or omitted.

The functions of roof bracing roof bracing performs three distinct functions. Truss stability bracing this is permanent bracing which holds the trusses upright straight and prevents any out of plane buckling of the members. 45 joist continuous purlin not less than size of rafter min. 2319 17 2 4 4 at gable ends this diaphragm shall be designed to transmit lateral loads imposed on the gable to roof diaphragms and or ceiling diaphragms where available.

Use a t brace to support the truss vertically. Usually trusses are put 24 inches apart. After all the bracing is measured cut and installed it will ultimately be pulled off before the roof sheathing goes on. Applicable to all trussed rafter roofs unless rigid sarking such as timber boarding or plywood is used.

Install 2x4s at a 45 degree angle. Roof ceiling framing bearing walls rafter span min. Temporary bracingthis is used to restrain the trusses during erection. Wood truss restraint and bracing guide positioning and bracing trusses during installation can be a time consuming process that can drive up labor costs on the project.

Slide the rest of the truss up using a 2x4 as a ramp if necessary.