Technical Information
Roofing & Wall Cladding
Bullnosed corrugated sheeting ideally suits traditional styled buildings where the verandah becomes a distinctive feature of the home. The curved profile of bullnosed sheeting is a popular choice for many home builders because of its attractive appearance and practical applications.
Crimp Curved Steel Clad 762 sheeting is manufactured through a computerised system to exacting tolerances. This dynamic profile is mainly suited to commercial premises and can be used in the main roof line or, again, as a feature verandah. The end result is a building of distinction that highlights the versatility of metal roofing.
Both Bullnose Corrugated and Steel Clad 762 Crimp Curved sheeting are available in the full range of COLORBOND® colours or simply in the galvanised or Zincalume® finishes.
METHOD OF LAYING CORRUGATED CURVING
Lay the first sheet on the frame work taking into consideration the prevailing weather direction. Ensure that the nose of the sheet fits into the gutter correctly and touches all fixing points without any excessive pressure being applied. Begin your screw fixing on the overlap side progressively working your way up the sheet ensuring that the sheet remains square with the building. When fixing the second sheet you follow the same procedure but you must ensure that the first sheet remains level across the nose at all times otherwise you will start to get a wave effect along the run of sheets at each lap. You can prevent this by constantly checking that the sheets are level or fix a string line at the top of the curve, along the run of sheeting ensuring each sheet remains level. You will notice a saw tooth effect on the ends in the gutter. This is a natural occurrence and cannot be avoided and the saw tooth length should be approximately the same on each lap. Measure every third or forth sheet from your start point to keep sheets square. Always take care to make sure radius of sheets fit properly together.
NOTE: Minimum recommended radius to curve 400mm.
METHOD OF LAYING STEEL-CLAD CRIMP CURVE
Lay the first line of sheeting at the end of the building away from the prevailing weather. Fix the lowest sheet first and work up to the ridge overlapping as you go. The sheeting is to be positioned with its leading edge a suitable distance inside the edge of the building, maintaining this dimension along the full length of the building edge so that it is exactly aligned and square with the building frame. Lay subsequent sheets in a similar manner overlapping as you go and taking care to match the curved areas to each other, locating adjacent crimps accurately and fixing the side laps tight together before the main fasteners are added.
Because of the rigidity imparted to the Crimp curve bends, the curved areas are the critical fixing areas and only minimal re-alignment can be made in these areas. It is therefore necessary to keep the alignment correct on every sheet as it is laid.
On occasions where two (2) or more datum points occupy on one elevation, fixing should commence by working away from these points as previously described, and if necessary, at a convenient position a slip flashing may be introduced to provide any required adjustment.
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 weather-proofing. One the bends sufficient side lap fasteners are to be added to ensure absolute weather tightness. Use No 8x12 Hex Head Type 5 Self Drilling Screw with Neo. Washer or Blind Rivet.
NOTE: Minimum recommended radius to crimp 550mm.
CURVE DESIGNS
Note:COLORBOND® and colour names are registered trademarks of BlueScope Steel Limited.
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