Technical Information
Roofing & Wall Cladding
Multi Clad
Multi Clad is the modern, stylish, high strength, light weight roof and wall cladding material, Made from high tensile steel. the profile has been engineered to give the highest strength and rigidity using the least material. It is manufactured locally by continuous roll forming of prefinished steel coil giving a low cost high quality product.
ADVANTAGES
COST SAVINGS
Multi Clad being made from light gauge material and having an efficient profile is therefore a low cost cladding material. Also because of its strength and rigidity less understructure is required. This together with ease of handling and simple pierce fastening method keeps the cost of your building down low.
PROTECTION
Zincalume® and Pre-painted Zincalume® coated steel provides the best protection from the environment and gives long life to any building.
LONG SPANS
Multi Clad although having widely spaced ribs is remarkably strong and has the ability to recover after excessive loads have been placed on it. This allows the use of wide support spacings while still being able to resist wind and other loads.
COVERAGE
Multi Clad has an effective coverage of 762mm when laps of one rib are used.
ROOF PITCH
Water entry is prevented by the special anti-capilliary drain built into the overlapping and underlapping ribs which allows low pitches to be used. The minimum recommended roof pitch is 3°.
LENGTHS
Multi Clad can be cut in the factory to any length specified by the customer. When determining lengths required for roofs allow 50mm extra for overhang into gutters.
SUPPORT RECOMMENDATIONS FOR NON-CYCLONIC AREAS
MAXIMUM SUPPORT SPACINGS
Values are given in Table 1 below for buildings located under the following conditions as specified by AS.1170 Part 2 SAA Wind Code:
- Area - Non-cyclonic (Note: For cyclonic refer to local manufacturer.)
- Max. Building Height - 3m
- Wind Velocity - 50 m/s
- Internal Pressure Coefficient - +0.2
- Terrain Category - 3
ALLOWABLE WIND PRESSURES
For buildings of different wind pressures and conditions, calculate the actual wind pressure from AS.1170 and then determine the maximum support spacing from Table 2. The allowable wind pressures and maximum support spacings have been determined from tests carried out in accordance with AS.1562.
(Note: For cyclonic refer to local manufacturer or click here for more details.)
APPLICATION
COMPATABILITY
Lead flashings and copper or copper alloy materials should not be used with or in run-off situations with Zincalume® sheeting. Also do not use lead head nails.
SEALING
Zincalume® or pre-painted materials cannot be soldered and to seal a suitable sealant and mechanical fasteners must be used.
MATERIAL SPECIFICATIONS
MATERIAL
The material used complies with:
Zincalume® Grade G550/AZ150 (550 MPa minimum Yield Stress) coated with a minimum 150 gm/sqm. zinc/aluminium alloy as specified in AS.1397 Ap. B. Pre-painted Zincalume® baked silicon modified polyester paint applied over Zincalume® steel sheet Grade G550/AZ150.
The steel base and metal coating conforms to AS.1397.
THICKNESS
Multi Clad is produced in a Base Material Thickness of 0.42mm. (0.48mm TCT.)
MASS
Per Unit Area - 4.29kg/m²
Per Unit Length - 3.26kg/m.
TABLE 1 - MAXIMUM SUPPORT SPACING
NOTES:
1. The recommended number of fasteners must be used.
TABLE 2 - ALLOWABLE WIND PRESSURE
NOTE: For roofing the maximum allowable spans to resist concentrated forces are:
END - 1300
INTERNAL - 1700
SINGLE - 1000
INSTALLATION
PRINCIPLE
The sheets of Multi Clad overlap each other and are fixed progressively along the building in the opposite direction to the prevailing weather. This gives complete weather protection and o fast and efficient method of installing the roof. Each sheet consists of an over rib and an under rib and when put together form an anti-capilliary drain which prevents water entry.
PREPARATION
Lift packs of Multi Clad 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 5° 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) are to 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
NON-CYCLONIC AREAS
Steel Framing (up to 5mm):
A Crest Fixed - No 12 x Hex Head Self Drilling Tek with Neo. Washer.
B. Valley Fixed - No 10 x 16 Hex Head Self Drilling Tek with Neo. Washer.
Timber Framing (Hardwood):
A. Crest Fixed - No 12 x 65 Hex Head Type 17 Self Drilling Wood Screw with Neo. Washer.
B. Valley Fixed - No 10 x 22 Hex Head Type 17 Self Drilling Wood Screw with Neo. Washer.
Timber Framing (Softwood):
A. Crest Fixed - No 14 x 75 Hex Head Type 17 Self Drilling Wood Screw with Neo. Washer.
B. Valley Fixed - No 12 x 40 Hex Head Type 17 Self Drilling Wood Screw with Neo. Washer.
CYCLONIC AREAS
(Note: For cyclonic refer to local manufacturer or click here for more details.)
SIDE LAP FASTENERS
These are added at the midspans of the sheets for support spacings over 900mm for roofs and 1200mm for walls to give weatherproofing. Use No 8 x 12 Hex Head Type S Self Drilling Screw with Neo. Washer OR 04 Monel Sealed 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
When unloading bundles of sheeting with a crane always use a spreader bar and fabric slings to prevent damage. When manually handling sheets use clean dry gloves 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 slight deformation of the rib is observed and 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.
NON CYCLONIC
(Note: For cyclonic refer to local manufacturer or click here for more details.)
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