Fastener Requirements for High Wind & Cyclonic Areas


Don’t put your roof at risk with inferior fastening solutions

In a high wind situation, the weakest part of any structure to failure is the roof. Once the roof has gone there is little chance the building will survive in high winds and cyclonic conditions. Selecting the right fastener solution is crucial for the roof’s survival in a cyclone.



Choosing the Right Cyclonic Plates and Washers

For the best performance in a cyclone, it is important to choose the right plate and washer system. For crest fixing Buildex Roof-lok® Cyclonic Plates are recommended over conventional bonded washer systems as it provides superior roof holding capability. With a large contact area, Roof-lok® is designed to withstand high wind loads and minimise the stress between the washer and the roof sheet. This dramatically improves the ability to hold down the roof, giving it the best chance of survival in a cyclone. Roof-lok® also includes a double washer system, consisting of an upper and lower EPDM seal with a recess holding this in place. This helps prevent water entry between the screw head, cyclone plate and roofing profile. Click on image to enlarge to see test results of Roof-lok® compared to conventional 25mm bonded washer systems. For more information on Roof-lok® view the video here.



High wind load pressure testing

Most Australian rollformers put their roofing profiles through cyclonic Low High Low testing at James Cook University with high wind load pressure using Buildex® Cyclonic Plates such as Roof-Lok. This represents the standard for performance of their roofing profiles in cyclonic conditions. Roof-Lok also has Deemed to Comply Approval (m/192) from the Northern Territory Building Advisory Committee. Therefore, asset owners and installers can have the confidence that Roof-lok is tested and proven to deliver superior roof holding performance and is suitable for roofs designed for Category 5 Cyclones.



Corrosion Protection Requirements

One of the causes of failure of cladding systems in a cyclone is the loss of strength from corroded fasteners. Therefore, for optimal performance in a Cyclone ensure your fasteners are equipped with a high performance corrosion coating like Climaseal 5 or Climaseal 4 for superior corrosion performance.

Click here for more information on Buildex® Guaranteed Corrosion Protection.



Buildex® Cyclonic Plates & Washers - Recommended Application

Buildex® MultiSeal 25mm

Buildex® Roof-lok®

Buildex® Hi-Rib

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For Ridge Cap Fixing

Crest fixing for corrugated and square rib roof profiles.

Crest fixing for Hi-Rib roof Profiles.

p 0952 200b

p 0848 200

p 0993 200b


Fastener Selection Guide for Cyclonic Areas

Click on the appropriate link below for more information on cyclonic assemblies for your particular application.

Roof Sheeting – Cyclone Assemblies

Insulated Panel Roof Sheeting – Cyclone Assemblies

Cladding Fasteners

In cyclonic areas, 14 gauge cladding fasteners are recommended.