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Steel-Clad 762
STEEL-CLAD 762 is the modern, stylish choice for any building situation that calls for high strength, light weight roof and wall cladding material.
It provides an economical solution available in the full range of COLORBOND® steel colours to meet any design requirement. STEEL-CLAD 762 has a bold profile that will look good for the life of the building it covers.
INSTALLATION
PRINCIPLE
Sheets of STEEL-CLAD 762 overlap each other and are fixed progressively along the building in the opposite direction to the prevailing weather. This gives complete weather protection and a fast and efficient method of installation Each sheet has an “over” rib and an “under” edge rib. When lapped with adjacent sheets these form an anti-capillary drain which prevents water entry.
PREPARATION
Lift packs of STEEL-CLAD 762 onto the roof frame so that all sheets are the right way up and with the over edge facing the end of the roof where laying will commence. Prevent roof damage by walking only in the pans of the sheets and stand on the ribs only at supports. When the roof pitch is less than 15° or where there are extreme weather conditions, turn the sheet ends up approx. 80° at the high end and down approx. 15° at the gutter or low end. A turn up/down tool is used to do this.
END LAPPING
When two or more sheets are required for full length cover, start laying at the gutter and work up to the ridge and then start the next run. The minimum end laps required are:
Roofs– Pitch up to 15° – 230mm
Pitch over 15° – 150mm
Walls – 100mm
End laps in roofs with a pitch of <5° (1 in 12) should be sealed. End laps must be positioned over a support and the support spacings either side are to be that recommended for an end span.
FIXING
RECOMMENDED FASTENERS
Steel Framing (up to 5mm):
A. Crest Fixed – No 12x Hex Head Self Drilling Tek with Neo. Washer
B. Valley Fixed – No 10x16 Hex Head Self Drilling Tek with Neo. Washer
Timber Framing (Hardwood):
A. Crest Fixed – No 12x65 Hex Head Type 17 Self Drilling Wood Screw with Neo. Washer
B. Valley Fixed – No 10x22 Hex Head Type 17 Self Drilling Wood Screw with Neo. Washer
Timber Framing (Softwood):
A. Crest Fixed – 14x75 Hex Head Type 17 Self Drilling Wood Screw with Neo. Washer.
B. Valley Fixed – No 12x40 Hex Head Type 17 Self Drilling Wood Screw with Neo. Washer
SIDE LAP FASTENERS
These are added at the midspans of the sheets to give weatherproofing for support spacings over 900mm for roofs and 1200mm for walls. Use No 8x12 Hex Head Type S Self Drilling Screw with Neo. Washer OR blind rivets.
METHODS OF FIXING
Roofs – Pierce fix through crests only using 1 fastener through every rib at every support (4 Fasteners/sheet).
Walls – Crest fixing as for roofs OR Valley fixing can be used. Valley fixing requires 1 fastener beside every rib at every support (4 Fasteners/Sheet). If valley fastening is used, side lap fasteners must be added beside each main fastener.
PRECAUTIONS
Always use a spreader bar and fabric slings to prevent damage when unloading bundles of sheeting with a crane. Use clean dry gloves when handling sheets and do not drag sheets over each other. Storage of sheets should be above ground and under cover. Crest fasteners must not be overtightened but driven in until the neoprene washer is fully sealed. Do not locate fasteners less than 25mm from the end of sheets. Do not use punches to form holes for fasteners. Holes are to be drilled or self drilling fasteners are to be used.
COVERAGE
STEEL-CLAD 762 has an effective coverage of 762mm when laps of one rib are used.
ROOF PITCH
The normal recommended minimum roof slope is 1 in 20 (approximately 3°). however, in non-cyclonic areas where roofs are in single sheet lengths, with a run of less than 15 metres, a minimum roof slope of 1 in 30 (approximately 2°) may be used.
