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It was noted in the purlin tables that the addition of braces or blocking gives very little if any increase in load capacity under bending (sagging and hogging) and compression. This is due to restraining effect of the sheeting. Therefore, the bracing effects are not presented in the tables since the cost saving enabled by the elimination of braces is often significant. However central blocking is recommended for girts (horizontal wall members) spanning over 5m, to resist the cladding gravity load. Also, when the roof pitch is steep, central blocking may be required for purlins (horizontal roof members) for constructability. Futura® Box-Beams may be used for blocking, either in the same size as the braced member, or in a smaller size with load spreading brackets; refer to the manufacturer for details.
Not all projects require purlin brace but this is for the engineer to determine based on specifics for the project, the span, the roof slope etc. Where required the FB15008 Futura Box-Beam is fitted mid-span between adjacent purlins as the brace member with purlins up to FB35012. This is connected using the FPC (Futura Purlin-brace Connector) brackets to match the purlin size with the last 3 digits of the bracket code. As shown below FPC150-200 is for 200-250mm purlins, FPC150-300 is for 300mm purlins and FPC150-350 is for 350mm purlins.
The above Buyers Guide.
Suitability of the product for the intended application, engineering design, and compliance with the NZ Building Act and any other statutory requirements is the sole responsibility of the purchaser.
Risk, and the responsibility for insurance, pass to the purchaser upon delivery, which occurs upon collection by your carrier, or delivery to the destination by Futura's carrier.
General Terms & Conditions of Sale - click to view
(Updated 21/03/2024)