Specifications

STANDARD SPECIFICATION - BUILDINGS
DPI REFERENCE TEXT - APRIL 2009
PAGE 11
TIMBER & STEEL CONSTRUCTION
Sponge nish
After screeding and nishing with a steel trowel
obtain and even textured sand nish by wiping the
surface with a damp sponge.
Broom nish
After oating use a broom to produce an even
textured slip-resistant surface.
3.11 MISCELLANEOUS ITEMS
Concrete strength: 25 MPa.
Clothes hoist footing: 400 deep x 250 diameter with
a 300 x 300 x 75 mm thick concrete surround above
the nished ground line weathered away from the
post.
Splash Pads: Provide 600 x 600 x 50 mm thick
concrete splash pads at each downpipe to direct the
water away from the building.
Mowing strips: Provide 300 wide x 75 thick concrete
mowing strips where shown on the drawings. Fall
away from building and construct tooled joints at 3
m maximum centres.
Gas cylinder pad: Provide 1000 x 500 x 100 mm
thick concrete base slab where shown on the
drawings or as directed.
Footpath Crossings: To local authority requirements.
4. TIMBER AND STEEL CONSTRUCTION
4.1 GENERAL
Cross references
Refer to the following sections:
• GeneralRequirements: For termite protection
and timber durability.
• Concrete: For installation of foundation bolts.
• Tiling: For waterproong wet areas.
• Cladding&Lining: For timber trims.
Standards
Timber framing and ooring: To AS 1684 or AS
1720.1.
Structural steelwork: To AS 4100.
Steel framing: Provide a proprietary system
designed to AS 3623.
Preparation of metal surfaces: To AS 1627.
Cold Formed Sections: To AS /NZS 4600
4.2 MATERIALS AND COMPONENTS
Cold-formed steel framing
Cold-formed sections from zinc-coated steel or
aluminium/zinc alloy coated steel to AS 1397/Z200
or AZ175.
Self-drilling screws
Standard: To AS 3566.2 corrosion resistance class
2.
Flashings and damp-proof courses
Standard: To AS/NZS 2904.
Timber fasteners
Metal washers: Provide washers to the heads and
nuts of all bolts and coach screws.
Steel straps: Zinc-coated steel to AS 1397/Z275,
minimum size 25 x 1 mm or 30 x 0.8 mm.
Galvanizing
Galvanize mild steel components (including
fasteners) to AS 1214 or AS/NZS 4680, as
appropriate, if exposed to weather; embedded
in masonry; or in contact with chemically treated
timber.
Electrogalvanizing
Ferrous hollow and open sections: To AS 4750.
4.3 STRUCTURAL STEEL
Inspection - Witness Point
Witness Point: Give sufcient notice so that
inspection may be made at the following stages:
• Commencement of shop fabrication.
• Surface preparation prior to painting.
• Steelwork and column bases erected on site, prior
to grouting, encasing, site painting or cladding.
Shop drawings - Hold Point
Hold Point: Submit 2 complete sets of shop drawings
showing the relevant details of each assembly,
component, connection and details of transport and
erection.
Materials Grade
Steel Section
Structural bars & sections to 250
AS/NZS 3679.1
Steel plates to AS 3678 250
Hollow steel sections to AS 1163 250 or 350
Cold form sections to AS 1379 G450 Z350
4.4 CONSTRUCTION
Beam Camber
If beam members have a natural camber within the
straightness tolerance, fabricate and erect them
with the camber up.
Foundation bolts
Hexagonal bolts: To AS 1111.1.
Hot-dip galvanized: To AS 1214.
Supply each foundation bolt with 2 nuts and 2
oversize washers and provide sufcient thread to
permit the levelling nut to be set below the base
plate.
Specifications March 2009.indd 11 11/03/2009 11:47:10 AM