NBS Source
Megaspan Purlins and Girts

Application

Primarily used in the design of sheds, industrial and commercial buildings, and are typically used to support the roof and wall sheeting.

Description

Megaspan Purlins and Girts is a range of performance enhanced purlins manufactured from high tensile galvanised steel. These profiles have capacity improvements of more than 20% compared to the standard purlin. Some features of these purlins include:

  • Optimised profiles with improved capacities.
  • Maximised efficiencies.
  • Normally supplied with holes punched in.

General information

Material

Steel.

Shape

Dependant on profile configuration.

Size

Dimensions vary per sectional profile. Depths range from 150 mm to 400 mm. Lengths are cut to order.

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Uniclass 2015

Pr_20_76_51_21 Cold-formed galvanized steel sections

Primary

SpecPack

05400 Cold Formed Metal Framing

NATSPEC National Classification System

0342 Light steel framing

SpeedSpec

05400 Cold Formed Metal Framing (Load Bearing)

Specification data - Cold-formed galvanized steel sections Enhanced data

Material

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Thickness

1.2 mm.

1.5 mm.

1.9 mm.

2.4 mm.

3.0 mm.

Corrosion protection

-

Standard

To AS 1397.

Class

For more severe environments, Z450 will be required. Heavier coated products are subject to minimum orders and lead times.

Z350.

Coating thickness

For more severe environments, 450 g/m² (Z450) will be required. Heavier coated products are subject to minimum orders and lead times.

350 g/m².

Steel grade

G450.

G500.

G550.

Configuration

Standard C-section.

Downturn Lip C-section.

Nestable C-section (box configuration).

Standard Z-section.

Lappable Z-section.

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Section

Applicable to both C and Z sections. The first 3 digits indicate the depth of the section (i.e. 150 is 150 mm deep). The last two digits indicate the material thickness (i.e. 12 is 1.2 mm).


Tolerances of ±5 mm in overall length, ±1 mm in flange width, ±1 mm in depth and ±1.5 mm in hole centres.

150 12.

150 15.

150 19.

150 24.

200 12.

Minimum order quantity and lead time may apply.

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MassDensity

2.78 kg/m (C or Z 150 12.)

3.47 kg/m (C or Z 150 15.)

4.40 kg/m (C or Z 150 19.)

5.56 kg/m (C or Z 150 24.)

3.49 kg/m (C or Z 200 12.)

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Hole cutouts

Preferred method of dimensioning is hole centre to hole centre rather than referenced from one end. Overall purlin length is also required for dimensional checking.

Standard hole centres include:

  • 18 x 22 mm holes, 40 mm apart for 100 mm purlin.
  • 18 x 22 mm holes, 60 mm apart for 150 mm purlin (in Victoria, standard is 18 x 22 mm holes, 70 mm apart).
  • 18 x 22 mm holes, 110 mm apart for 200 mm purlin.
  • 18 x 22 mm holes, 160 mm apart for 250 mm purlin.
  • 22 mm round holes, 210 mm apart for 300 mm purlin.
  • 22 mm round holes, 260 mm apart for 350 mm purlin.
  • 22 mm round holes, 310 mm apart for 400 mm purlin.


Alternative hole sizes, shapes and centres are available upon request.

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Environmental information

Country of product manufacture

Australia

Literature

Megaspan Purlins and Girts Design Manual

Megaspan Purlins and Girts Design Manual