Roof Truss Bracing Plan

Roof purlins applied to top chord continuous full length typically 24 on center.

Roof truss bracing plan.

Roof truss design 1 24 span 2 web with plywood gussets figure 1 figure 1 roof truss 24 span 2 web with plywood gussets detailed information for a 2 web roof truss with a 24 span with plywood gussets. Bracing for roofs that are approximately square. Then brace it back to the ground or to some other stable part of the structure. Figure 2 shows both roof plane bracing and roof space bracing as.

Conclusions on roof framing. Strutted roof either roof plane or roof space bracing is required in accordance with para graphs 10 3 2 and 10 3 3 for light and heavy roofs see figure 2. Temporary bracing for gable end roof some gable end trusses are designed to sit on the end wall. Bracing for roofs less than 6 6m wide on detached or staggered stepped buildings.

Truss bracing requirements are found in section r802 10 3. Bracing sometimes not required for truss and framed roofs roof space bracing. This section requires trusses to be braced to prevent rotation and to provide lateral stability. Applicable to all trussed rafter roofs unless rigid sarking such as timber boarding or plywood is used.

It allows the bracing requirement to be specified in the construction documents or on the individual truss design drawings. Trusses which are not braced or which are not braced correctly are subject to toppling over or collapse. Each truss run terminates with a set of diagonal braces as indicated below. The roof the house has a gable roof with 300 mm overhangs at the soffit and verge on the 2 storey section and a hip roof on the single storey section see figure 1.

It is very important that the contractor or homeowner responsible for truss erection read through all documents inside the job packet. The roof is a light roof. In this case the highest end of the trusses is considered the ridge line and requires at least two braces over its length. As well running an attic air duct system can be very difficult if the roof trusses were not designed for that application.

As you can see the initial plan for framing your roof needs to take into account several key variables such as the shape of the roof and any relevant community building codes. Section 10 3 to work out the roof space and roof plane bracing required. Bracing of trusses is extremely important. Trusses spaced further apart require more bracing.

You will then have to choose between two very different types of roof framing stick framing vs. O required permanent truss member bracing locations. Diagonal rafter bracing should be approximately 45 to the rafters on plan. There are several components to bracing trusses.

Once the tsbrs have been located the locations of the required diagonal bracing tbd22 can easily be added starting with the first five trusses in the run and then every ten 10 truss spaces thereafter. On gable roofs start with the gable truss which is located over or just inside the end wall.