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Profiled Metal Decking
Guidance on some of the materials used to form roof decks can be found in Clause 6 of BS6229:1982.
Profiled metal decking typically consists of galvanised steel, coated steel or aluminium that is profiled to provide the necessary strength to suit the span and load requirements. These materials are generally used for lightweight roof systems, where rapid installation is required.
The choice of thickness, profile, acoustic perforation and finish of the decking will be dependent on the required span, roof construction, imposed dead and live loading and any aesthetic consideration, such as requiring a decorative exposed underside. To provide a sound base for the insulation and waterproofing system and to avoid reduced drainage performance, the mid-span deflection of the metal deck should not exceed 1/250 of the span under uniformly distributed loads. When considering the deck profile and the necessity for metal deck closures, reference should be made to the manufacturers of the deck, insulation and membrane.
Trapezoidal metal decking will generally be installed by the single ply roofing contractor and should be secured against wind uplift in accordance with the deck manufacturers requirements. Most other forms of decking, such as concrete, timber and woodwool, are typically installed by the general contractor.
Material specifications throughout Europe are defined in the following documents:
Galvanised Steel
Minimum recommended thickness 0.7mm to BS EN 10147:1992 Fe E280G Z275. Typical gauge range 0.7-1.2mm.
Coated Galvanised Steel
Minimum recommended thickness 0.7mm to BS EN 10147:1992 Fe E220G Z275. Typical gauge range 0.7 - 1.2mm.
Plain Aluminium
Minimum recommended thickness 0.9mm to BS EN 485-2:1994 AA3004 H34. Typical gauge range 0.9-1.2mm) and BS EN 485-2:1994 AA3103 H16. Special fasteners may be required in mechanically fastened applications.
Coloured Aluminium
Minimum recommended thickness 0.9mm to BS EN 485-2:1994 AA3004 H34 and BS EN 485-2:1994 AA3105 H25. Special fasteners may be required in mechanically fastened applications
© 2006 Sarnafil Ltd. Legal Disclaimer
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