LIB88s Rafters Span Tables

Loading Data - Light Roof with No Snow Loads


Roof Structure: Steel Sheet Roofing .50mm, Timber Purlins, lightweight insulation (20kg/m2)
Ceiling: Ceiling Battens, 13mm Plasterboard (20kg/m2)
Wind Zone and Pitch: All Wind Zones at up to 35° roof pitch
Snow Zone: N0, N1, N2, N3 – No Snow Loads Applied to an altitude of 100m

Table 1: LIB Rafters – Single Span
Size Rafter Spacing
450 600 900 1200
Maximum Span (mm)1
200.88 5500 5200 4700 4300
240.88 6100 5800 5300 4900
300.88 6900 6500 5900 5600
360.88 7600 7100 6500 6100

1. When the maximum span is used the dynamic deflection may be more than desired. Please take this into consideration when specifying.

Table 2: LIB Rafters – Continuous Span
Size Rafter Spacing
450 600 900 1200
Maximum Span (mm)1
200.88 6900 6500 5900 5500
240.88 7600 7200 6600 6100
300.88 8600 8100 7300 6700
360.88 9500 8900 7300 7000*

1. When the maximum span is used the dynamic deflection may be more than desired. Please take this into consideration when specifying.
2. Continuous Span can be used when the shortest span is at least 60% of the longest span.

Loading Data - Heavy Roof with No Snow Loads

Roof Structure: Tiles, Timber Battens, lightweight insulation (70kg/m2 )
Ceiling: Ceiling Battens, 13mm Plasterboard (20kg/m2 )
Wind Zone and Pitch: All Wind Zones at up to 350 roof pitch
Snow Zone: N1, N2, N3 – No Snow Loads Applied to an altitude of 100m

Table 3: LIB Rafters – Single Span
Size Rafter Spacing
450 600 900 1200
Maximum Span (mm)1
200.88 4700 4300 3700 3400
240.88 5300 4900 4300 3900
300.88 6000 5600 5100 4600
360.88 6600 6200 5600 5300*

1. When the maximum span is used the dynamic deflection may be more than desired. Please take this into consideration when specifying.

Table 4: LIB Rafters – Continuous Span
Size Rafter Spacing
450 600 900 1200
Maximum Span (mm)1
200.88 5800 5400 4900 4400
240.88 6400 6000 5400 5000
300.88 7200 6800 6100 5700*
360.88 8000 7400 6700 6200

1. When the maximum span is used the dynamic deflection may be more than desired. Please take this into consideration when specifying.
2. Continuous Span can be used when the shortest span is at least 60% of the longest span.

Loading Data - Light Roof with Snow Loads

Roof Structure: Steel Sheet Roofing .50mm, Timber Purlins, lightweight insulation (20kg/m2)
Ceiling: Ceiling Battens, 13mm Plasterboard (20kg/m2 )
Wind Zone and Pitch: All Wind Zones at up to 350 roof pitch
Snow Zone: N4, N5 – Snow Loads Applied to an altitude of 100m or 0.9kPa sg

Table 5: LIB Rafters – Single Span
Size Rafter Spacing
450 600 900 1200
Maximum Span (mm)1
200.88 5500 5100 4500 4100
240.88 6400 5800 5200 4700
300.88 6900 6500 5900 5600
360.88 7600 7100 6500 6100

1. When the maximum span is used the dynamic deflection may be more than desired. Please take this into consideration when specifying.

Table 6: LIB Rafters – Continuous Span
Size Rafter Spacing
450 600 900 1200
Maximum Span (mm)1
200.88 6900 6500 5900 5500
240.88 7600 7200 6600 6100
300.88 8600 8100 7300 6700
360.88 9500 8900 7300 7000*

1. When the maximum span is used the dynamic deflection may be more than desired. Please take this into consideration when specifying.
2. Continuous Span can be used when the shortest span is at least 60% of the longest span.

Loading Data - Heavy Roof with Snow Loads

Roof Structure: Tiles, Timber Battens, lightweight insulation (70kg/m2 )
Ceiling: Ceiling Battens, 13mm Plasterboard (20kg/m2 )
Wind Zone and Pitch: All Wind Zones at up to 350 roof pitch
Snow Zone: N4, N5 – Snow Loads Applied to an altitude of 100m or 0.9kPa sg

Table 7: LIB Rafters – Single Span
Size Rafter Spacing
450 600 900 1200
Maximum Span (mm)1
200.88 4600 4200 3600 3300
240.88 5300 4800 4200 3800
300.88 6000 5600 5000 4500
360.88 6600 6200 5600 5100*

1. When the maximum span is used the dynamic deflection may be more than desired. Please take this into consideration when specifying.

Table 8: LIB Rafters – Continuous Span
Size Rafter Spacing
450 600 900 1200
Maximum Span (mm)1
200.88 5800 5400 4900 4400
240.88 6400 6000 5400 5000
300.88 7200 6800 6100 5700*
360.88 8000 7400 6700 6200

1. When the maximum span is used the dynamic deflection may be more than desired. Please take this into consideration when specifying.
2. Continuous Span can be used when the shortest span is at least 60% of the longest span.

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