Universal beams (UB) are higher than they are wide and are usually used in a horizontal position. They are also known by their old names such as RSJ (Rolled Steel Joist) and “I” beams. Modern beams have flanges of uniform thickness whereas earlier beams and small beams today have tapered flanges. 100 and 125 beams are still made with tapered flanges, see tapered flanged beams (TFB) for more detail on those.

UNIVERSAL BEAMS

Universal beams are the most common type of steel beam type in roof construction. Typically they are used in conjunction with timber in most roofs, providing additional strength as required. However, many modern homes or buildings with flat roofs rely solely of steel universal beams or their counterparts for support with steel purlins running above or between them.

ROLLED STEEL JOIST (RSJ)

Rolled steel joist (RSJ) was the traditional name widely used in the past for universal beams. The name is still widely used overseas in some countries, but it has become less common now in Australia to refer to them as RSJs.

‘I’ OR ‘H’ Beams

Universal beams are also often colloquially referred to as I beams or H beams due to their appearance being similar to the capital letter ‘I’ when the bottom and top lines are included, or as a capital letter H on its side.

ROOF BEAM SPAN CHART*

The table below shows universal beam spans for a single storey tiled roof:

BEAM SIZE MAXIMUM OPENING
150UB14 Up to 4.0m
150UB18 Up to 4.5m
180UB18 Up to 4.9m
180UB22 Up to 5.2m
200UB22 Up to 5.5m
200UB25 Up to 6.0m
250UB31 Up to 7.0m

*Consult your engineer where construction is 2 storey or if there is greater than normal load over an opening.

UNIVERSAL BEAM DIMENSIONS

The following are table provides the physical dimensions for the range of universal beams.

BEAM SIZE WEIGHT HEIGHT WIDTH FLANGE THICKNESS WEB THICKNESS FLANGE DEPTH INTERNAL DEPTH
150UB14 14.0kg 150mm 75mm 7.0mm 5.0mm 35.0mm 136mm
150UB18 18.0kg 155mm 75mm 9.5mm 6.0mm 34.5mm 136mm
180UB16 16.1kg 173mm 90mm 7.0mm 4.5mm 42.75mm 159mm
180UB18 18.1kg 175mm 90mm 8.0mm 5.0mm 42.5mm 159mm
180UB22 22.2kg 179mm 90mm 10.0mm 6.0mm 42.0mm 159mm
200UB18 18.2kg 198mm 99mm 7.0mm 4.5mm 47.25mm 184mm
200UB22 22.3kg 202mm 133mm 7.0mm 5.0mm 64.0mm 188mm
200UB25 25.4kg 203mm 133mm 7.8mm 5.8mm 63.6mm 188mm
200UB30 29.8kg 207mm 134mm 9.6mm 6.3mm 63.85mm 188mm
250UB25 25.7kg 248mm 124mm 8.0mm 5.0mm 59.5mm 232mm
250UB31 31.4kg 252mm 146mm 8.6mm 6.1mm 69.95mm 234mm
250UB37 37.3kg 256mm 146mm 10.9mm 6.4mm 69.8mm 234mm
310UB32 32.0kg 298mm 149mm 8.0mm 5.5mm 71.75mm 282mm
310UB40 40.4kg 304mm 165mm 10.2mm 6.1mm 79.45mm 284mm
310UB46 46.2kg 307mm 166mm 11.8mm 6.7mm 79.65mm 284mm
360UB45 44.7kg 352mm 171mm 9.7mm 6.9mm 82.05mm 333mm
360UB51 50.7kg 356mm 171mm 11.5mm 7.3mm 81.85mm 333mm
360UB57 56.7kg 359mm 172mm 13.0mm 8.0mm 82.0mm 333mm
410UB54 53.7kg 403mm 178mm 10.9mm 7.6mm 85.2mm 381mm
410UB60 59.7kg 406mm 178mm 12.8mm 7.8mm 85.1mm 381mm
460UB67 67.1kg 454mm 190mm 12.7mm 8.5mm 90.75mm 428mm
460UB75 74.6kg 457mm 190mm 14.5mm 9.1mm 90.45mm 428mm
460UB82 82.1kg 460mm 191mm 16.0mm 9.9mm 90.55mm 428mm
530UB82 82.0kg 528mm 209mm 13.2mm 9.6mm 99.7mm 502mm
530UB92 92.4kg 533mm 209mm 15.6mm 10.2mm 99.4mm 502mm
610UB101 101.0kg 602mm 228mm 14.8mm 10.6mm 108.7mm 572mm
610UB113 113.0kg 607mm 228mm 17.3mm 11.2mm 108.4mm 572mm
610UB125 125.0kg 612mm 229mm 19.6mm 11.9mm 108.55mm 572mm