Why Z Purlins Are Useful for Continuous Roof Runs
The main advantage of the Z section is not simply its shape. Z purlins can be arranged with laps over supports, making them particularly useful for continuous roof framing. This can help create an efficient secondary framing system when the structural design is based on continuous members.
Z Purlin vs. C Purlin
Factor:
C Purlin:
Z Purlin:
Simple framing
Strong choice
✓
Continuous roof runs
✓
Strong choice
Lapping over supports
Limited use
Key advantage
Customized sections
✓
✓
Pre-punching
✓
✓
Why are Z purlins used for long roof runs?
Z purlins can be lapped over supports, making them useful for continuous framing arrangements.
