Howick’s Tophat purlins offer a great alternative to Cee purlins and have many benefits for handling and shipping. Spans of up to 7m are achievable. Sample installation and span information is available here. Benefits include:
The Howick FRAMA TH700 machine produces a 100mm, 120mm and 150mm tophat section in 0.95 and 1.15mm material.
The Tophat sections can be lapped to increase their performance. Typical spans (NZ Standards):
Tophat purlins are also commonly used in shed structures as they offer large spans with minimal material useage.