LIB88s Floor Joist Span Tables

Loading Data - 1.5kPa Live Load

Structure: A superimposed dead load of 50kg/m(30kg/m2 flooring x 20kg/m2 ceiling)

Table 1: LIB Joists – Single Span
Size Joist Spacing
300 400 450 600
Maximum Span (mm)
200.88 5200 4600 4400 4300
240.88 5800 5400 5200 4800
300.88 6500 6100 5900 5500
360.88 7200 6700 6500 6000
Table 2: LIB Joists – Continuous Span
Size Joist Spacing 
300 400 450 600
Maximum Span (mm)
200.88 5700 5200 5000 4700
240.88 6300 5800 5700 5200
300.88 7100 6600 6400 5900
360.88 7900 7300 7100 6600*

* denotes member must have a minimum 65mm bearing length at the internal support

Loading Data - 2kPa Live Load

Structure: A superimposed dead load of 50kg/m (30kg/m flooring x 20kg/m ceiling)

Table 3: LIB Joists – Single Span
Size Joist Spacing
300 400 450 600
Maximum Span (mm)
200.88 5000 4600 4400 4200
240.88 5600 5200 5000 4700
300.88 6300 5900 5700 5300
360.88 6900 6500 6300 5900*

* denotes member must have a minimum 45mm bearing length at the 2 supports

Table 4: LIB Joists – Continuous Span
Size Joist Spacing
300 400 450 600
Maximum Span (mm)
200.88 5800 5200 5000 4800
240.88 6400 5900 5800 5300
300.88 7300 6700 6500 6100*
360.88 8000 7400 7200+ 6700+

* denotes member must have a minimum 65mm bearing length at the internal support

+ denotes member must have a minimum 85mm bearing length at the internal support

Loading Data - 3kPa Live Load

Structure: A superimposed dead load of 50kg/m (30kg/m flooring x 20kg/m ceiling)

Table 5: LIB Joists – Single Span
Size Joist Spacing
300 400 450 600
Maximum Span (mm)
200.88 4600 4300 4100 3700
240.88 5100 4800 4600 4300
300.88 5800 5400 5200 4500
360.88 6400 6000 5800 4500
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