BUTLER^® structural purlins are factory pre-punched to assure proper fit and alignment
BUTLER^® structural purlins are the connection between the steel structures and the roof
   & wall  systems. They are integrated to the complete building system
Major secondary structural members used to support the wall and roof panels: purlins are
   used on  the roof & girts are used on the walls
Designed in accordance with the 1996 Edition of the American Iron and Steel Institute (AISI),
    "Cold-Formed Steel Design Manual"
The typical types of roof and wall secondary are “Z” and “C” section
Z -section is used for continuous span bays, and it is factory pre-punched to match BUTLER?
    panel systems
C-section is used for simple span bays and opening support
Truss purlin is another common type of secondary, used for long-bay buildings. Truss
    Purlin is  constructed of cold-formed, lipped hat section chords and continuous, cold-formed
    round tubing  diagonals. Chord to tube welds are typically resistance-projection type