COLD FORMED PORTAL FRAME
The cold formed portal frame rafter is lighter than the hot rolled section. This enables the roof structure to lifted in place by a crane and therefore it can be assembled on the slab where labour costs and safety are advantageous.
Introduction
I passed this site just after Christmas on my push bike. At first glance it appeared to be an ubiquitous portal frame. However the shining relfections from the frame signalled that it was different.
The portal frame was not your normal hot rolled steel UB section but cold rolled. The type you usually see in those kit garages and barns, but this spans 20m!
The cold formed portal frame rafter is lighter than the hot rolled section. This enables the roof structure to lifted in place by a crane and therefore it can be assembled on the slab where labour costs and safety are advantageous.
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