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In the absence of specific product standards, designers
have a number of options when specifying purlins.
- Nominate the purlins by size and specific manufacturer,
to the exclusion of all others
- Specify by size and manufacturer and allow equivalent
- Specify the major dimensions and properties
such as: depth, flange width, base metal thickness,
yield strength, protective coating mass of section and
leave the choice of manufacturer to the contractor.
Selection of the correct coating weight, Z350 or Z450,
is critical to the long-term corrosion performance of
The choice is dependant on the environment in which
the purlin is to be used. For example, Z350 will suit
most applications that are not subject to high corrosive
environments. For high corrosive environments you need
to specify Z450.
Please refer to our technical specifications for more