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The steel frames, the most critical part of your shed, determines whether your shed is strong enough to withstand the elements over the coming years. Our shed frames make us market leaders in strength. However, in addition to strength, you need to consider corrosion. frames are always manufactured from Bluescope's Galvaspan® steel, which comes with the best defect and corrosion warranties on the market.
Below is a diagram of terminology used for the various steel frame components to assist you in comparing quotes between shed companies.
steel frame diagram
understanding steel frame sizes
To make a judgement about the strength of your shed, you must know the size of the steel frames and what contributes to strength.
portal frames (columns and rafters)
  • End portal frames are generally lighter than internal portal frames (unless you you have a fully open end wall).
  • The distance between the portal frames is called the bay width. The wider apart the portal frames, the stronger they need to be. Wider bays need stronger portal frames, (but there will be fewer portal frames in the shed).
  • Using an "rigid-based footing" increases the performance of the column allowing the use of lighter columns in the portal frames in some circumstances.
  • See a comparison of the relative strength of portal frame sizes
purlins and girts
  • The wider apart the portal frames, the stronger your purlins and girts need to be. Wider bays need stronger purlins and girts.
  • A greater distance between purlins or girts (i.e fewer purlins or girts in your shed) requires stronger purlins and girts.
  • For bays wider than 4 metres, it is often cost effective to add bridging rows between purlins and girts. Bridging increases the performance of purlins and preventing them from twisting or bowing under compressive loads. Up to a point, more rows of bridging means greater strength.
  • Overlapping purlins and girts increases their strength. Up to a point, more overlap means greater strength. 15% overlap is commonly used for purlins and girts.
  • Your choice of roof sheeting and wall sheeting will affect the minimum number of purlins and girts you need. See roof and wall sheeting for more information.
Paul M - Central Qld
broadacre farmer
"When I'm protecting my equipment, there's too much at stake to cut corners on quality."
"I am very pleased that offered such a high standard of building at such a competitive price."
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