Download Sharp MD-S10E Specifications

ROOFING
7.ROOFING
7.1
GENERAL
Cross reference
Refer to the Insulation and Sarking section for roof
sarking requirements.
7.2
MATERIALS AND COMPONENTS
Roof material
Formed from G550 steel (or G300 for curving) with
an AZ 150 Finish complying with AS 1397.
Protection: Protect the roof sheets from damage
during handling and storage and prevent damage
by moisture in stacked sheets.
Prepainted Steel
Prepainted steel sheet, factory finished with a
polyester finish to AS/NZS 2728.
Flashing material
Use material with the same finish and from the same
manufacturer as the roofing sheets.
Thickness: 0.55mm BMT steel sheet.
Fasteners
Self-drilling screws: To AS 3566.1, complete with
washers and EDPM black, non conductive seals.
Corrosion resistance: To AS 3566.2.
• Tropical areas: Class 4
• Inland areas: Class 3
Exposed fasteners: Provide fasteners which are
prefinished with an oven baked polymer coating to
match the roofing material.
Fixings: Use only approved metal fixings.
Roof lights
Type: As scheduled or shown on the drawings
and fitted in accordance with the Northern Territory
Deemed to Comply standards.
7.3
INSPECTION
Notice - Witness Point
Witness Point: Give sufficient notice so that
inspection may be made of the substructure before
fixing the roof sheeting.
7.4
ROOF STRUCTURE
Alignment
Check and adjust the alignment of the roof structure
before fixing any sheets.
Battens: 2 mm maximum mismatch at abutting
ends.
Roof Plane: 5 mm per metre maximum deviation
across the battens from a plane parallel to the
specified roof slope.
7.5
METAL FASCIA & BARGE
Stratco 0.55 mm BMT prepainted steel 210 mm or
185 mm deep to suit the particular application.
Fixing: Fix to rafter ends with proprietary fixing clips
in accordance with manufacturer’s instructions.
Provide corner trims, end trims and cappings as
required.
7.6
METAL ROOFING
Design and installation
Standard: To AS 1562.1.
Fixing: Fix the sheeting in accordance with the
Northern Territory Deemed to Comply standards.
Visible accessories
Provide material with the same finish as roofing
sheets.
Eaves
Treat ends of sheets as follows:
Generally: Close off ribs at tops and bottoms of
sheets by mechanical means or with purpose-made
end caps.
Turn ends of pans up at tops and down into gutters
at bottoms by mechanical means.
Project sheets 50 mm into gutters.
Fit purpose-made ridge and eaves fillers of closed
cell polythylene similar to Unisil.
Swarf
Remove swarf and other debris as soon as it is
deposited.
7.7
ROOF PLUMBING
Selection and installation of rainwater goods
Standard: To AS/NZS 3500.3.
Sealing: Seal fasteners and mechanically fastened
joints with silicone sealant.
Fixings: Use only approved metal fixings.
Flashings and cappings
General: Flash projections above or through the
roof with two part flashings consisting of an apron
flashing and an over-flashing, with at least 100 mm
vertical overlap. Provide for independent movement
between the roof and the projection. Continue over
flashing to the roof ridge.
Wall abutments: Where a roof abuts a wall, provide
overflashings as follows:
• Masonry or concrete: built into a 25 mm deep
raking sawcut.
• Planked cladding: Stepped.
Pipe Penetrations: Seal with a neoprene coupling
clamped to the pipe and fixed to the profile of the
roof sheeting.
Proprietary Item: Dektite flashings by Deks-Thyer
Pty Ltd.
Colour: To match the roof sheeting.
In Concrete or Masonry: Turn 25 mm into joints or
grooves, wedge at 200 mm centres with compatible
material and point up.
Gutters
Generally: Prefabricate gutters to the required
shape where possible. Form stop ends, bends and
returns. Turn down into outlets. Provide overflows
to prevent back-flooding.
STANDARD SPECIFICATION - BUILDINGS
DPI REFERENCE TEXT - APRIL 2009
PAGE 17
Specifications March 2009.indd 17
11/03/2009 11:47:10 AM