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Purlins, girts and eave struts are secondary structural members used to support the wall and roof panels. Purlins are used on the roof; girts are used on the walls and eave struts are used at the intersection of the sidewall and the roof.
Secondary members have two other functions: they act as struts that help in resisting part of the longitudinal loads that are applied on the building such as wind and earthquake loads, and they provide lateral bracing to the compression flanges of the main frame members thereby increasing frame capacity.
The secondary structural members are designed in accordance with the 1986 Edition of the American Iron and Steel Institute (AISI).
* Cold-Formed "Z" Sections
* Cold-Formed "C" Sections
* Eave Strut Section
* Secondary Framing Details
Purlins, girts and eave struts are available in two standard surface finishes and in six standard thickness as shown in the table below:
Standard Material
Surface finish
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Specifications
(equivalent to)
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Available Thickness (mm)
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Purlins/Girts
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Eave Struts
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Z-Sections
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C-Sections
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Red Oxide (Primer)
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ASTM A607
Grade 50
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1.5, 1.75, 2.0,
2.25, 2.5, 3.0
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2.0, 2.5, 3.0
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2.0, 2.5
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Pre-Galvanized
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ASTM A653
Grade SS50, Class I
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1.5, 1.75, 2.0,
2.25, 2.5
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2.0, 2.5
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2.0, 2.5
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