Roof Truss Gable End Bracing

Some of these standard details may be sealed upon request.

Roof truss gable end bracing. Roof truss repair details. Connections at the base of the gable wall. Brace the top of the gable end wall by tying it to the rafters or tops of the trusses. This is done by plumbing the truss and securing as described above for the first gable end.

Flange at each gable brace connection to strongback gable end truss 90x45 gable brace standard truss spacing 90x45 runner over bottom chords of trusses. Once the roof trusses are stacked into a place they can be positioned one at a time. View the following detail guides. Height 5 5m on gable end wall clause 1 1 2 o nzs.

Truss clusters for maximum strength this image shows a cluster of three trusses tied together. Web plane gable end frame bracing. When winds blow against the gable end they push it towards the interior of the house and push up on the roof overhanging the gable end. Bracing the second gable end is advisable.

In the photo below on the left notice that wind pressure has pulled out the bottom of the gable end triangle and partially pulled out the rectangular wall below. This type of failure is shown in figure 7. To assist the building designer in determining the bracing requirements to transfer lateral loads from the gable end frame into the roof and or ceiling diaphragm many truss designers provide standard design tables and details based on typical design assumptions used by building designers figure 12. Strengthen the gable end wall studs.

The completed gable end bracing accomplished using the steps outlined below should look like the light colored framing shown in the picture below. In some cases the expected loads will be too high for the gable end frame end wall studs or ceiling diaphragm. Stagger top and bottom cord bracing so the lumber ends on different trusses for additional rigidity as you work your way down the building. Fix strongback gable brace and runner as below stud wall as per nzs 3604 2011 full height brick veneer max.

First the most common type of failure is loss of roof sheathing from the gable end that results in the gable wall loosing its bracing along the top edge. If the roof eave extends beyond the gable end wall by more than 1 then a dropped gable is normally used to support the roof sheathing. Begin with the second gable end truss and work back towards the first gable end. Wind bracing truss clusters at both gable ends and at least every 20 add wind bracing green for truss.

For more information on gable end frame bracing see the following. The top chord of the gable is dropped so that the framer can run a series of outlookers or ladders from the fascia back to the first common truss. Attach tool box to board that will span over the space between. Contact mitek engineering support for any questions.