Bracing Requirements Steel Parallel Cord Roof Trusses

Trusses to be erected with minimal bow in the truss and in any chord with a tolerance not exceeding the lesser of l 200 and 50mm where l is as defined as shown in diagrams.

Bracing requirements steel parallel cord roof trusses.

Angle cut upper end to fit tight to truss top chord. For the preceding example. Trusses to be erected so that no part of the truss is out of plumb with a tolerance exceeding the lesser of height 50 and 50 mm. Steelbrace layout for long roof spans 8m to 13m where the roof length l is long compared to the half span h of the roof truss such that it would result in a brace angle less than 30 two or more crossed bracing bays shall be required each side of the ridge line to ensure the brace angle is between 30 and 45 see figure c5 04 04 04.

Extend parallel to fully recessed purlins to top chord of first pair of trusses. 30 to 45 8 o c. Web a vertical or inclined member connecting the top and bottom chords of a truss. Bracing will attach to each endwall column over 7 from corner.

Up to 30 10 o c. Bracing for three planes of roof this bracing method is for all trusses except 3x2 and 4x2 parallel chord trusses. Small roof planes less than 6 m such as dormers or porches also do not require bracing. 45 to 60 6 o c.

8 22 diagram a 90 x 35 cleat. For truss and framed roofs roof space bracing and roof plane bracing are not required where there is sarking that meets nzs 3604 2011 clause 10 4 4 requirements or where there is a structural ceiling diaphragm complying with clause 13 5 directly attached to the rafters. Attach using lsta 12 bracket. Truss bracing requirements are found in section r802 10 3.

End as per table. 2 75 mm nails each. 60 to 80. Roof ceilings at walls and floors.

Connection of bracing to clause 8 3 6 9 and 8 3 6 10. This section requires trusses to be braced to prevent rotation and to provide lateral stability. Top chord temporary lateral brace tctlb spacing. It allows the bracing requirement to be specified in the construction documents or on the individual truss design drawings.

Connection of braced walls parallel to trusses. Nail 2x4 on edge to column side directly behind endwall truss bottom chord. Where bottom chord ties are required they shall be braced or fixed to a building element such as supporting walls which in turn can transfer these bracing loads to the structure.