MULTIBEAM
42Pages

OLVED EAM EV IB ULT M Lighter I Stiffer I Stronger I Greener 6

Overview 8 Spanning Systems 9 Anti-Sag Requirements 10 Purlin Restraints 12 Construction Details 16 Product Dimensions and References 24 Section Properties 32 Load Tables 33 M350 M300 M265 M235 M205 M175 M145 Flange 65mm Flange 65mm Flange 65mm Flange 65mm Flange 65mm Flange 90mm Flange 90mm 7 Roof Purlins Roof Purlins

Multibeam Roof Purlins - Overview Applications - All types of roof cladding - Pitched, mansard, curved or flat roof applications - Roof slopes from 0°to 60° - Bay widths up to 15m Material Specification Hot dip galvanised steel to BS EN 10326:2004 and BS EN 10143:1993 ‘specifications for continuously hot dip zinc/metal coated structural steel strip’. The minimum grade of steel used is S450GD, with Z275 zinc coating, giving an average coating thickness of 0.02mm to each side. Other galvanised coatings may be available. Please contact our Technical Department for advice. Sustainability The...

Use d ouble sp syste m wh an ere possi ble • fewe r com ponen • quick ts! er to erect! Most double span bar lengths can be provided, although bays over 9m generally use single span lengths and are sleeved at every other joint to maintain continuity. Multibeam can be supplied in various lengths, please check with our Sales Department for lengths over 18m. Multibeam can be used in all the popular and economic purlin spanning systems. The enhanced stiffness of the Multibeam shape makes it ideal for all span dimensions from the very short to the very long with purlin bar lengths of 18m or more,...

Anti-Sag Requirements Multibeam purlins on popular spans do not generally require anti-sag ties. In certain circumstances such as wind reversal conditions, large bay sizes or cladding systems that do not provide lateral restraint, then anti-sag ties may be required. Please refer to table 1:1 or the Kingspan Toolkit Software. Mult ibeam purli do no ns t req uire antisag popul ties on a (up t r spans o 6.1m roof and slope s 10˚ or le ss). Table 1:1 Anti-Sag requirements for differing bay centres at varying roof slopes Roof Slope < 3° Multibeam Purlin Section Depth (mm) Bay Centres <3.0 >3 -...

Roof Purlins Typical Tubular Tie Arrangement Typical Angle Strut Arrangement Ties installed in line Typical Multilok Tie Arrangement Typical Multilok Tie Arrangement M145 Purlin sections M175 and M205 Purlins Ties staggered For details on hole groups please go to page 135. 11

Purlin Restraint Multibeam purlins can be used with all types of modern roof cladding systems including metal composite panels, standing seam, insulated membrane panels, and traditional tiles. However, it should be noted that certain types of roof cladding do not give the necessary lateral restraint to purlins and additional restraints may be required. Please consult Table 1:2 for guidance. Table 1:2 Restraint requirements for various types of roof cladding Type of roof cladding Provides lateral restraint Load Table Yes Use normal load tables Yes Use normal load tables Yes See additional...

Roofing systems - Through fix Built-up Roofing Generally comprises of a trapezoidal outer weather sheet, insulation, spacers and an inner liner sheet all assembled on site. Where the profiled liner sheet is steel with a minimum gauge of 0.4mm using self tapping screws at maximum cross centres of 350mm, then adequate restraint is provided to the Multibeam purlins to enable the published load tables to be supported. Restraints as table 1.1, page 10. Where there is no steel liner sheet through fixed to the purlin, additional restraints must be provided as shown in table 1.3 to enable the...

Purlin Restraint (Continued) 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 System The 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...

(Roof slopes 3˚ or less) For this application the term ‘Flat Roof’ generally means any roof with a roofslope no greater than 1:20 or 3°. Built up Standing Seam roofing systems A specialised form of built up roofing system where the outer weather sheet has a side seam that stands above the water trough. These systems will have a weather sheet, halters, spacers, insulation and a liner sheet. Typically this system can be classed as clip fixed where the outer sheet is free to move or is fixed. Where the outer sheet is free to move and through fixed profiled steel liner minimum gauge 0.4mm using...

Construction Details - Purlin System Weld-on Multicleat Bolt-on Multicleat For product dimensions refer to page 25. For product dimensions refer to page 25. Stiffened extended cleat* Multicleat with raised section* For product dimensions refer to page 27. For product dimensions refer to page 25. * Available in weld or bolt-on variations. 16

Roof Purlins Purlin Sleeve Sleeve Hole Dimensions 1000 475 475 10 Purlin Gap 100 325 Sleeve For product dimensions refer to page 28. Cantilever with Stub Stub Multibeam Purlin Stub Multibeam Gable Rail NB: Max length of stub = 2 metres 17

Construction Details - Purlin System Cantilevered Purlin with Sleeve Cantilever sleeved to purlin L CL Cleader angle Cleader As on upper practical limit CL should not exceed L/5. Check deflections and capacity where loads on CL differ from those on L. Sleeve Cleader angle offers restraint to section. Where it is not used provide other suitable restraint. For product dimensions refer to pages 28 and 31. Cantilevered Purlin without Sleeve Purlin continuous onto cantilever L CL Cleader angle Cleader As on upper practical limit CL should not exceed L/5. Check deflections and capacity where...