Fastener Frequency

The fastener frequency for fixing roof and wall cladding is determined by the wind uplift load for the particular site and the gauge of the cladding. In low wind load areas, the frequency may be determined by a sufficient number to prevent the cladding from 'flutter' or noise associated with the relative movement of the cladding against the structure.

A uniform linear fastening pattern should be used to resist wind uplift loads; however, additional staggered fastening may be necessary to avoid noise and flutter.

Nailing and screwing patterns are shown in Fastener Patterns, and the pullover values in Pull-over Values.

The primary fastener frequency should not exceed 600 mm, and where this is not possible a secondary fastener should be used at closer spacings. Where fixing is not provided for primary fasteners, secondary fasteners such as stitching screws, type 17 and 4.8 mm aluminium rivets can be used, providing their number and frequency equates with the equivalent primary fastening for the wind design load.