RSJ steel beam size for 3m, 4m, 5m, 6m, 7m, 8m, 9m and 10m span. The appropriate size for RSJ (Rolled Steel Joist) beams depends on various factors, including the load they need to support and the specific application.

In general, the size of an RSJ (Rolled Steel Joist) for a 3-meter span have to be 152×89×16, while the size of an RSJ for 4m span need to be 178×102×19. Likewise, the size of an RSJ for 5m span got to be 203×102×23, while the size of an RSJ for 6m span need to be 254×102×25. In addition, the size of an RSJ for 7m span ought to be 305×102×28, while the size of an RSJ for 8m span need to be 346×127×33.

There is different shape and size of A rolled steel joist (RSJ), hot rolled Steel section such as H beam (universal column), I beam (universal beam), angles, channels and etc are used in construction project such as field of agriculture construction, industrial construction, multi storey building, different factories and residential projects.

Today is the demand of steel structure in the field of construction projects that replace the depending on reinforced cement concrete, their higher strength, less time consuming, make it ideal for residential project in short duration.

RSJs are produced by being rolled from a single piece of structural steel of grade S275JR grade to maintain structural integrity and are used to support walls and floors when making an opening in a load bearing wall or when building an extension. These steel beams have good machinability, corrosion resistance, and weldability properties.

The universal RSJ steel beam sizes represented by their height of the web in mm x width of the flange in mm x the weight per metre in kilograms. When you measure the height and width it look like as capital I, hence also being known as I beam. The thickness of the web and flange can varies.

The web of RSJ universal steel beam helps to resists shear forces, whilst the flanges resist the larger part of the bending moment placed on the RSJ beam. They are also used to make retaining walls in landscape gardening with wooden sleepers placed between them, and to construct the frames of modern office blocks and industrial warehouses.

RSJ or Rolled steel joists are very popular in the building trade in UK, US, Australia, Canada and others countries used mainly for steel lintels. Small medium and large scale structural steel projects all use a variety of steel sections such as I beams, H columns and pfc channels.

What size RSJ do i need? Determining the size of a Rolled Steel Joist (RSJ) depends on various factors. However, a ‘rule of thumb’ for RSJ beam sizes is 1/20th X span therefore 1/20th X 4m = 200mm so assume a 178×102×19 or thereabouts.

The size of RSJ steel beam do i need for a 3m span is typically about 152×89×16, which includes the depth of the RSJ beam is 152mm, the width of the flange is 89mm and 16 is the weight in kg per meter.

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**RSJ steel beam size for 3m, 4m, 5m, 6m, 7m, 8m, 9m and 10m span**

As per general experience and thumb rule, to calculate the required and necessary depth of beam, divide the span length in mm by 18 to 20 such as span length in mm/ depth = 18 to 20 for primary beam and for secondary beam span length to depth ratio is about 15 to 18. The width of this beam would be 1/3 and 1/2 of the depth. The dimensions of a Girder would be same, but the flange would be thicker. A beam overhang can be maximum of 3/8 of the supported span.

The appropriate size for an RSJ (Rolled Steel Joist) beam for a 3m span need to be 152×89×16, for a 4m span 178×102×19 RSJ , for a 5m span 203×102×23 RSJ, for a 6m span 254×102×25 RSJ, for a 7m span 305×102×28 RSJ, for a 8m span 356×127×33 RSJ, for a 9m span 406×140×46 RSJ and for a 10m span is 406×178×54 RSJ.

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**RSJ steel span rule of thumb**:- depth of the RSJ are in the range of 1/2 inches for each foot span, represented as L/24. Thumb rule for depth of roof beam or roof joist = 0.5 × span in inches, depth of floor beam or floor joist = 0.6 × span in inches and depth of composite beam = 0.55 × span in inches.

**RSJ beam size for 3m span**

The RSJ beam size required for a 3m span need to be 152×89×16. This includes the depth of the RSJ beam is 152mm, the width of the flange is 89mm and 16 is the weight in kg per metre.

**RSJ beam size for 4m span**

The appropriate RSJ beam size required for 4m span have to be 178×102×19. This includes the depth of the RSJ beam is 178mm, the width of the flange is 102mm and 19 is the weight in kg per metre.

**RSJ beam size for 5m span**

The RSJ beam size required for 5m span need to be 203×102×23. This includes the depth of the RSJ beam is 203mm, the width of the flange is 102mm and 23 is the weight in kg per metre.

**RSJ beam size for 6m span**

The RSJ beam size required for 6m span need to be 254×102×25. This includes the depth of the RSJ beam is 254mm, the width of the flange is 102mm and 25 is the weight in kg per metre.

**RSJ beam size for 7m span**

The RSJ beam size required for 7m span need to be 305×102×28. This includes the depth of the RSJ beam is 305mm, the width of the flange is 102mm and 28 is the weight in kg per metre.

**RSJ beam size for 8m span**

The RSJ beam size required for 8m span need to be 356×127×33. This includes the depth of the RSJ beam is 356mm, the width of the flange is 127mm and 33 is the weight in kg per metre.

**RSJ beam size for 9m span**

The RSJ beam size required for 9m span need to be 406×140×46. This includes the depth of the RSJ beam is 406mm, the width of the flange is 140mm and 46 is the weight in kg per metre.

**RSJ beam size for 10m span**

The RSJ beam size required for 10m span need to be 406×178×54. This includes the depth of the RSJ beam is 406mm, the width of the flange is 178mm and 54 is the weight in kg per metre.

**How much does a 3m RSJ weigh**

Typically a 3m of RSJ beam weighs approximately 48kg. One may often ask **“how heavy is a 3m RSJ”**, best suitable for 3m span, a 152×89 size of Rolled steel section or RSJ can weigh around 16 kg per meter. So, for 3m length 16×3 = 48kg. Thus, 3 meters of a 152×89 mm size of RSJ can weigh about 48kg for spanning upto 3m length.

**How much does a 4m RSJ weigh**

Typically a 4m of RSJ beam weighs approximately 76kg. One may often ask **“how heavy is a 4m RSJ”**, best suitable for 4m span, a 178×102 size of Rolled steel section or RSJ can weigh around 19 kg per meter. So, for 4m length 19×4 = 76kg. Thus, 4 meters of a 178×102 mm size of RSJ can weigh about 76kg for spanning upto 4m length.

**How much does a 5m RSJ weigh**

Typically a 5m of RSJ beam weighs approximately 115kg. One may often ask **“how heavy is a 5m RSJ”**, best suitable for 5m span, a 203×102 size of Rolled steel section or RSJ can weigh around 23 kg per meter. So, for 5m length 23×5 =115 kg. Thus, 5 meters of a 203×102 mm size of RSJ can weigh about 115kg for spanning upto 5m length.

**How much does a 6m RSJ weigh**

Typically a 6m of RSJ beam weighs approximately 150kg. One may often ask **“how heavy is a 6m RSJ”**, best suitable for 6m span, a 254×102 size of Rolled steel section or RSJ can weigh around 25 kg per meter. So, for 6m length 25×6 =150 kg. Thus, 6 meters of a 254×102 mm size of RSJ can weigh about 150kg for spanning upto 6m length.

**How much does a 7m RSJ weigh**

Typically a 7m of RSJ beam weighs approximately 196kg. One may often ask **“how heavy is a 7m RSJ”**, best suitable for 7m span, a 305×102 size of Rolled steel section or RSJ can weigh around 28 kg per meter. So, for 7m length 28×7 =196 kg. Thus, 7 meters of a 305×102 mm size of RSJ can weigh about 196kg for spanning upto 7m length.

**Conclusions**:-

Typically for residential buildings or any other projects, a RSJ beam (steel beam, universal beam or w beam or I beam or UB’s) size UB 203×102×23 or W8 is required for a span of 5m (meters). So if the span of the beam is 5m, a RSJ beam UB 203 × 102 × 23 or W8 is required.

**Disclaimer**: All the given Steel beam size are based on thumb rule and it can be used for general knowledge purpose, do not use it for professional because actual size of steel beam based on steel design structure