Specifications

STANDARD SPECIFICATION - BUILDINGS
DPI REFERENCE TEXT - APRIL 2009
PAGE 31
PLUMBING & DRAINAGE
Corrosive water areas: Use class 16 Polybutylene
pipes to AS/NZS 2642.2 and where exposed, use
316 stainless steel pipes.
Finishes
Finish exposed piping, including ttings and supports
as follows:
• Internal locations such as toilet and kitchen areas:
Bright chrome plate.
• Externally: Paint.
• Concealed but accessible spaces (including
cupboards and non-habitable enclosed spaces):
Leave unpainted except for required identication
marking. Prime steel piping and iron ttings.
Valves
Finish valves to match connected piping.
Tapware and Fixtures
Provide sanitary xtures and tapware as scheduled
or shown on the drawings.
Toilet Cisterns
Provide toilet cisterns complying with a minimum 4A
water efciency rating.
16.7 CONSTRUCTION GENERALLY
General
Install piping in straight lines and to uniform grades.
Arrange and support the piping so that it remains
free from vibration and water hammer, whilst
permitting thermal movement. Keep the number of
joints to a minimum. Prevent direct contact between
incompatible metals.
Concealment
If practicable, conceal piping and ttings requiring
maintenance or servicing so that they are accessible
within non-habitable enclosed spaces such as roof
spaces, suboor spaces and ducts. Keep pipeline
in suboor spaces at least 150 mm above ground
and ensure access can be provided throughout
for inspection. Provide at least 25 mm clearance
between adjacent pipelines (measured from the
piping insulation where applicable).
Embedded pipes: Do not embed pipes that operate
under pressure in concrete or surfacing material.
Building penetrations
If piping passes through building elements provide
purpose-made metal or plastic sleeves formed
from pipe sections. Prime steel or iron before
installation.
Pipe supports
Materials: The same as the piping, or galvanized
or non-ferrous metals, with bonded PVC or glass
bre woven tape sleeves where needed to separate
dissimilar metals.
Cover plates
Where exposed piping emerges from wall, oor or
ceiling nishes, provide cover plates of non-ferrous
metal, nished to match the piping, or of stainless
steel.
Connections to Network Utility Operator Mains
General: Excavate to locate and expose the
connection points and connect to the Network
Utility Operator mains. On completion, backll and
compact the excavation and reinstate surfaces and
elements which have been disturbed such as roads,
pavements, kerbs, footpaths and nature strips.
16.8 STORMWATER
Standard
General: To AS/NZS 3500.3 or AS/NZS 3500.5.
Cleaning
During construction, use temporary covers to
openings and keep the system free of debris. On
completion, ush the system using water and leave
it clean.
Pipelaying
Lay pipelines with the spigot ends in the direction
of ow.
Downpipe connections
Turn up drain branch pipelines to nish 50 mm
above nished ground or pavement level.
Subsoil drains
Connection: Connect subsoil drains to the
stormwater drainage system.
Trench width: Minimum 450 mm.
Subsoil drains: Provide proprietary perforated
plastic pipe.
Filter fabric: Provide a non woven polymeric fabric
formed from a plastic yarn containing stabilisers
or inhibitors to make the laments resistant to
deterioration due to ultraviolet light.
Filter sock: Provide a non woven polyester permeable
sock capable of retaining particles of 0.25 mm size.
Securely t or join the sock at each joint.
Backlling: Backll with 20 mm nominal size washed
screenings, to the following depths:
• To the underside of the bases of overlying
structures such as pavements, slabs and
channels.
• To within 75 mm of the nished surface of unpaved
or landscaped areas.
Stormwater Pits
Cover levels: Locate the top of covers or gratings,
including frames as follows:
• In paved areas: Flush with the paving surface.
• In landscaped areas: 25 mm above nished
surface.
• Gratings taking surface water runoff: Set to
receive the runoff without ponding.
Specifications March 2009.indd 31 11/03/2009 11:47:12 AM