Steeline Z Section Purlins are mainly used for commercial applications but are just as cost effective to be used for smaller type garages and carports. The Z sections can also form part of the columns and rafters in these smaller applications.
Safe roof purlins spans
The safe spans below are suitable for sheds and class 1 structures with the following assumptions: (Lapped continuous spans of Z purlin result in increased spanning capability over C section purlins)
Non-cyclonic sites only
Cpe = 0.9 and Cpi = +0.2
High Pressure Zones KL = 1.5 and 2.0 included
Max roof span allowed - 12M
All Spans to have 1 row of bridging
15% Lap must be fitted to all mid supports
Cleated or bracketed fixing Only - No flange bolting
Results are for at least two spans
Full calculation of requirements using Steeline section properties should be carried out for full verification.
DISCLAIMER: These span tables are to be used as a guide only. Independant engineering is required for purlins and girts, and is not available on this site.