Investing in a new shed is a big decision. So what is a portal frame and is it the best option for you?
In this article, we outline what a portal frame is and cover everything you need to know about the structural design, key components, and advantages of portal frames.
We also explore why structural steel is the best option when building your portal frame shed, helping you make an informed decision.
One of the main benefits of a portal frame is that you can gain a large open space inside your shed. With the right engineering and materials, a portal frame can be fully self-supporting from inside to outside. This means there is no need for additional supports inside the frame, maximising the usable internal space for storage and machinery.
Portal frames are one of the most cost-effective construction methods as they put the structural members to their best use, spanning the width of the building and maximising the open, usable space below. Most often our engineers find that propping the frame in the centre is not advisable until after a 36m span! In addition, our clients have found that minimising obstacles inside a building leads to more effective use of the space.
With a portal frame, the structural steel elements can be prefabricated into sections before being delivered to the building site. As the components are welded and bolted together in advance, on-site assembly is quick and easy. For an even faster construction time, check out our Durakit sheds — pre-designed, in stock and available in under 4 weeks.
Portal frames are strong and durable, particularly when made with structural steel. This means they are well suited to large-scale sheds for a range of purposes, including agricultural, industrial, commercial, and more. At ABC Sheds, we also manufacture cyclone-rated sheds with fully fabricated steel frames that can withstand the worst storms.
The two main options for portal frame construction are roll-formed steel and structural steel. Both can be used in portal frame buildings but each suits a different set of requirements. Generally, roll-formed steel is best used in smaller buildings and garages while structural steel is best for large sheds and buildings.
Roll-formed steel is made with high-tensile sheet metal that is rolled into a “C” shape. It is also called cold-rolled steel or c-section steel, typically measuring as little as 1-2mm thick. It is most suitable for smaller spans up to around 12m for domestic sheds and garages and light commercial applications.
Due to the light weight of the material itself, cold-rolled sections are heavily dependent on their engineered shape, meaning that any dent, rust, or damage could be cause for concern for the structural integrity of the building. Additionally, roll-formed steel cannot support additional weight from features like a gantry crane, solar panels or other mounted services. For most large-scale purposes and wider shed spans, we recommend structural steel instead.
Structural steel frames are far stronger than roll-formed steel, making them more suitable for any shed larger than 250 square metres.
Measuring between 5mm to 20mm thick, structural steel can support more weight – such as a gantry crane – and span over 60 metres with no centre supports. This is far more practical for larger sheds and varying storage needs. Structural steel is also far more weather-resistant, making it more suitable for harsh Australian conditions. In an agricultural or industrial environment, a shed can expect far more ‘bumps and nudges’ with all the heavy machinery moving every day. A structural frame will prove far more robust than a cold-rolled frame shed.
A structural steel shed frame is cut and welded to your requirements, giving you endless options for the design, shape, and size. The structural elements will also arrive at your site as prefabricated sections, making the assembly process much quicker.
If you’re looking for a reliable shed, contact us to request a quote today. Alternatively, download our full sheds brochure to learn more about our range and explore the possibilities.