Steel structure manufacturer since 2009 · 8 fabrication bases in China
Purlins carry the roof sheets to the rafters; girts do the same for walls. Both are usually cold-formed C or Z sections.
| C purlin | Z purlin | |
|---|---|---|
| Shape | Symmetrical C | Point-symmetric Z |
| Lapping at supports | No | Yes, nested |
| Best for | Simple spans, edges, girts, openings | Continuous multi-span roofs |
| Steel use on long runs | Higher | Lower |
Use both: Z purlins on the roof run, C sections at eaves, openings and walls is a common mix.
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