| Standing seam type systems (eg; Kingzip, Kalzip, etc...) The published safe loads may be used with all through fix single skin cladding, including use with foam board or over blanket insulation adequately fixed to the section. |
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| When using single skin cladding without a steel liner panel additional restraints are required as shown in Table 1:3, to enable published load tables to be used. | |||||||||||||||||||||||||||||||||||||||||||||
Restraint requirements for single skin cladding without a liner panel
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| Standing seam type systems (eg; Kingzip, Kalzip, etc...) The published safe loads may be used with all through fix single skin cladding, including use with foam board or over blanket insulation adequately fixed to the section. |
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A trapezoidal steel deck is fixed directly to the Multibeam purlins using self drill, self tapping screws. A layer of board insulation is placed on top of the deck and attached, plus an impermeable membrane is laid over the insulation and bonded or held in place by ballast. The deck is generally fixed at every trough to the purlin and will then provide sufficient restraint to support the published load tables if the secondary restraints are as shown in table
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| Tiled Roofs The shape and strength of the Multibeam section is eminently suitable to sustain the greater loadings imposed by a tiled roof. However, due to the nature of the forces imposed upon the purlin sections by this form of roof construction, additional considerations are required in the design of the purlin. 
Angle Strut Anti-Sag SystemThe angle strut brace system caters for the downslope force produced in the roof from dead and superimposed loads. The section capacities are based on using an anti-sag system with restraints at a minimum of 1/3 points and a minimum angle of 30° on the screwed rods. Table 1.4 shows the max spans achievable for this combination with the cross centres of purlins shown. Where the span is curtailed by the minimum 30° angle of the diagonal rods, place the restraints at 1/4 points as shown in table 1.4. One set of diagonals are required for every 6.0m length of roof slope. As long as this is complied with the roof slope can be any length. Stiffened cleats should also be used with tiled roof construction. Anti-Sag requirements with metal liner When certain cassette metal liner profiles are fixed to the purlin top flange, enough restraint may be provided in order to use the standard load tables in conjunction with the anti-sag system. For further advice please contact our Technical Department. |
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