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Fastener Patterns

Fastening patterns for the most commonly used profiles are designated in the following manner.

 

Corrugate Fastening Patterns

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Fixing Patterns for 5 Rib Sheeting

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Fixing Patterns for 6 Rib Sheeting

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These fastening patterns should be used in conjunction with load span graphs.

The load on a purlin and a purlin/rafter connection is determined by the wind load and the area of roof the load is acting upon. Roof fasteners transfer wind uplift-loads to the purlins, which in turn transfer them to the primary structure.

Fastening to every second purlin may be within the roof's load/span range, but will double the load acting on the fastened purlins. All purlins must be fastened to unless alternate purlins are specifically designed to take the additional loads

 

Symmetrical and Assymetrical Fastener Patterns

Symmetrical fastener patterns are more effective.

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/cop/structure/fastener-requirements-and-overhangs#fastener-patterns
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Revision Detail: 

Fastener pattern illustrations updated for clarity - no change to intent.

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