CATALOGUE

hst purlins & girts
Introduction
HST Steel Purlins & Girts are high strength lipped profile
sections, manufactured by Steel & Tube to provide an
economic solution for your building project and to assist
with design.
Sections are supplied punched and cut to length as
required. Accessories including speed channel, bracing,
sag rods and fastenings are offered to provide a practical
structural system.
HST Tophat Sections
Steel & Tube HST Tophat Sections are an economical and
lightweight product for roof purlins, wall girts and floor
joists.
Description
Steel & Tube’s galvanised cold formed steel HST Purlins
& Girts, with accessories, make up part of a total system
suitable to support a wide range of cladding materials,
including profiled metal sheeting, sandwich panels and
fibre cement sheeting. HST Purlin sections can also be
readily adapted to a wide range of other application such
as floor joists, ceiling support members and load bearing
wall studs.
Materials / Finish
HST Purlins & Girts are rolled from galvanised high
strength steel strip.
Steel Thickness Grade Zinc Weight
1.15 - 1.45 mm 500 (MPa) 275 gm/m 2
1.75 - 2.0 mm 450 (MPa) 275 gm/m 2
Purlin braces and accessories are formed from galvanised
Grade 250 steel.
Performance
HST Purlin and Girt loads are presented in limit state
format consistent with AS/NZS 1170:2002 “Structural
Design Actions”.
Load capacities have been determined in accordance
with AISI “LRFD Cold-Formed Steel Design Manual”, 1991
and confirmed by a full scale testing programme.
AS/NZS4600:1996 has not been adopted, as the testing
programme has demonstrated better correlation with the
AISI reference above. The enclosed tables are generally
conservative in relation to AS/NZS 4600:1996.
Durability
Provided HST Purlins, Girts and accessories are not
exposed to moisture, service life will exceed 50 years,
complying with the durability requirements of NZBC
Approved Document B2.
For applications within 1km of salt laden marine locations
or severe industrial corrosive atmospheres, specialist
advice should be sought.
Length
For ease of transportation and handling on site, the
bundled length should be limited to 18 metres. Lengths
exceeding 18 metres are subject to transport and
handling facilities by special arrangement.
Size Tolerances
Web Depth ± 2 mm Flange Width ± 2 mm
Lip ± 1 mm Hole Centres ± 1.5 mm
Web / Flange Angle 88-93º
Handling and Storage
All sections and accessories must be kept dry during
transport, stored on non-corrosive spacers above ground
and covered to prevent moisture from entering between
stacked sections. Should bundles become wet, they shall
be broken open, dried with a cloth and restacked with
separators to enable air to circulate.
Bracing
The HST Purlin & Girt system utilises standard brace / sag
rod components or speed channel where required by the
load tables. These shall be located in alternate bays, as
shown on page 2, generally with a brace channel located
immediately adjacent to both the eaves and ridge purlin.
The galvanised HST brace channels are manufactured
with end brackets custom fitted to suit the spacing.
Standard sag rods are electro galvanised 12 mm diameter
rod with double nuts and washers at each end. 16 mm
diameter sag rods can be supplied to special order. All
bracing components are fabricated from grade 250 (MPa)
steel.
Bracing should be located at the correct positions, as
shown on page 2 to match pre-punched hole locations,
otherwise lower load values may result.
Load values with zero bracing have been included
for the 100, 150 and 200 profiles, but generally it is
recommended that at least one set of braces be provided,
particularly when the HST Purlins will be used for access
and temporary loading during construction.