NBS Source
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

Purlins and Girts is a range of structural steel framing profiles manufactured from high tensile galvanised steel. Some features of these profiles include:

  • A range of profile configurations.
  • Available in a range of steel grades.
  • Spans further.
  • Factory hole-punch options available.

General information

Material

Steel.

Shape

Dependant on profile configuration.

Size

Dimensions vary per sectional profile. Depths range from 100 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

1.0 mm.

1.2 mm.

1.5 mm.

1.9 mm.

2.4 mm.

3.0 mm.

Corrosion protection

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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.

Nestable C-section (box configuration).

Standard Z-section.

Fascia purlin.

Section

Applicable to both C and Z sections. The first 3 digits indicate the depth of the section (i.e. 100 is 100 mm deep). The last two digits indicate the material thickness (i.e. 10 is 1.0 mm).


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

100 10.

Minimum order quantity and lead time may apply.

100 12.

100 15.

100 19.

150 12.

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MassDensity

1.75 kg/m (C or Z 100 10).

2.09 kg/m (C or Z 100 12).

2.59 kg/m (C or Z 100 15).

3.26 kg/m (C or Z 100 19).

2.86 kg/m (C or Z 150 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

Metroll Purlin Design Guide (C & Z Standard Purlins)

Metroll Purlin Design Guide (C & Z Standard Purlins)

Case studies

Ausco Modular Brisbane, QLD

Ausco Modular Brisbane, QLD