In the structural engineering industry, a whole host of materials and components are used when constructing new buildings and structures. 

If you’re a structural engineer or work within the construction industry in any way, it’s essential that you fully understand what the different options are and how to properly handle them. 

One of the most common features of construction is RSJs. These are structural steel beams that are frequently used for a wide range of construction and structural engineering applications.

But what does RSJ stand for?

In this article, the team here at IKT Consulting will explain what RSJ stands for and the important role these beams play throughout the construction industry. 

What does RSJ Stand for?

RSJ is an acronym that stands for rolled steel joist and refers to the beams and posts that are made from mild steel and which are utilised at construction projects across the country. These materials are manufactured during a process that involves rolling hot or cold steel inside structural steel manufacturing plants. 

In addition to hot and cold rolling, they can also be created using extrusion. 

What are RSJ posts?

As mentioned above, RSJ stands for rolled steel joists and refers to steel beams and posts that are used across the construction industry. They come in two main forms which are:

• H shapes 
• I shapes 

These innovative shapes help to protect the posts from heavy impacts which is why they’re frequently used for applications where large or heavy-duty vehicles are operating or driving at speed. Both the H and I RSJs are extremely durable and robust, and as well as being used for construction they are also regularly used as barriers. Whether being used as a beam or a post, RSJs are still designed in the same way and are always cut from mild steel.

RSJ beams and posts are available in a wide range of shapes and sizes and can be installed in a wide range of structural environments. They can also be created bespoke to specific specifications including different sizes that will meet the height requirements of a variety of projects. 

What are RSJs used for?

A rolled steel joist can be used for a variety of applications and purposes. Often, they act as posts to keep barriers in place. They’re extremely strong, they offer great durability and structural integrity that can keep buildings safe in the event of crashes or high-impact collisions. 

As well as providing support for barriers, RSJs are also used to provide load-bearing support for buildings and structures. When buildings and structures are being constructed, these beams and posts can be installed to help keep them durable and well-supported. In some instances, especially when constructing brand-new buildings, they’ll act as a necessary framework that offers integrity to the entire structure. 

RSJs are commonly found in the following environments:

• Factories 
• Industrial environments 
• Car parks
• Warehouses 
• Construction sites 
• Loading bays 
• Service yards 
• Civil engineering projects 

As well as assisting with the structural stability of buildings and other structures, RSJs can also help to keep potentially dangerous areas clear and visible to people - minimising the chance of accidents.     

Is the RSJ the same as a universal beam (I beam)?

As well as RSJs, the term universal beam, or I beam, is also commonly used across the construction industry. 

While sometimes listed as different products, I beams and RSJs are essentially the same thing. 

As highlighted earlier, RSJs typically come in two different shapes, Is and Hs, and an I beam is simply an RSJ that comes in an I shape. 

It’s important to note that an RSJ is not an official construction term and is often considered as a layman's way of describing a universal beam.  

What are the benefits of using RSJ posts?

RSJ (rolled steel joist) beams or posts are commonly used in construction, particularly in steel-framed buildings. These products offer a wide range of benefits including the following:

• Strength and stability: One of the biggest benefits of RSJ joints is that they provide excellent structural strength and stability which is crucial for supporting heavy loads and withstanding various forces such as gravity, wind and even seismic activity. 

• Versatility: Another advantage is that RSJ beams and posts often come in various shapes and sizes. This allows for versatility in both design and construction. They can also be customised to meet specific project requirements, making them suitable for a whole host of different applications. 

• Space efficiency: RSJ joints are known for having a high strength to weight ratio. This means that they can support significant loads while requiring minimal material. This efficiency in material usage translates to more usable space within the building and potentially lower construction costs. 

• Durability: Rolled steel joists are highly durable and resistant to corrosion, rust and degradation over time. Not only does this durability ensure the longevity of a structure, but it also reduces the need for frequent maintenance or repairs over the years - helping to save money while also keeping applications structurally sound. 

• Easy to install: A big boost for those in the construction industry is that, compared to traditional construction methods, RSJ beams and posts are relatively easy to install. This ease of installation can help to streamline the construction process and even reduce labour costs. In many cases, they are prefabricated away from the building site which further enhances efficiency. 

Overall, the use of RSJs comes with a range of benefits, making them a popular choice for structural framing in modern construction projects. Their strength, versatility, durability and more contribute to efficient and cost-effective building solutions. 

At IKT Consulting, we’re experts in structural engineering. We provide leading professional structural engineering services for homeowners, landlords, architects, fabricators, contractors and developers across the country.

Assisting both homeowners and those working within commercial environments, our range of services is comprehensive and includes structural inspections, structural reports, beam calculations and much more. To learn more about how we can enhance your next project, get in touch with our team today.