Purlin or Structural Steel? Which is Better for Your Shed?
When you are thinking of constructing a new shed, a common question that often arises is - which structural member should I opt for the shed? While there are a plethora of frame options available that can be used to provide support to a structural roof deck, Purlin and Structural Steel are the most popular choices. But before you finalise your selection, it is important to first note the differences between the two and then determine which type is suitable for designing your shed.
What is a Purlin?
In construction, a Purlin is a horizontal bar or beam that lends structural support to the roof of a building. It is manufactured using flat sheet steel which is rolled into a particular Purlin shape by a number of rollers. Hence, Purlins are also called roll-formed or cold-form steel. Purlins come in two main types - Z purlins and C purlins. In a purlin shed, the main portal frames are usually made using C purlins. For building a durable structure, you must source purlins only from trusted Z and C purlin suppliers.
What is Structural Steel?
Structural Steel is thicker in size than a purlin. This type of steel is heated and then passed through the rollers which is why it is also known as hot-formed steel. The main portal frames and roof rafters of a Structural Steel Shed are made of strong steel sections. These sections are welded and then bolted together, making it a sturdier design for constructing a steel shed. Among the various types of Structural Steel beams, the two main ones are Universal Beam and Welded Web Truss.
Advantages and Disadvantages of Purlin Sheds
- Purlin frames are more apt for building small sheds. A Purlin Shed is bolted and screwed together at the construction site which is ideal for smaller sheds, but in case of larger sheds, assembling everything requires a longer period of time. This increases erection costs by a great deal.
- When there is heavy machinery in use that could possibly damage the structure, and therefore in such cases purlins aren’t recommended.
Advantages and Disadvantages of Structural Steel Sheds
- Structural Steel is perfect for machinery sheds and warehouses where heavy machinery is being used. This type of steel being much thicker in size, does not get bent easily even if some machine accidentally bumps into it.
- Structural Steel Sheds can be completely customised into any shape and size as per engineers’ specifications.
- Even though it’s flexible, a lot of effort is required to make changes if components don’t fit appropriately.
- Due to the rusting tendency, the structural steel might require costly paints to ensure its durability.
Therefore, the basic conclusion that can be drawn from the above comparison is that while Structural Steel is more preferable for big sheds, Purlins are well-suited to sheds that are smaller in size. Reliable Z and C Purlin manufacturers will provide you with the best frames for building small sheds. Whichever type you end up choosing for building your shed, you must also keep the location of your shed in mind.
