Corrugated & Steel-Clad Curving Profiles
Lay the first sheet on the framework, 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 it 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.
The saw-tooth length should be approximately the same on each lap. Measure every third or fourth sheet from your start point to keep sheets square. Always take care to make sure the radius of sheets fit properly together.
NOTE: Minimum recommended radius to curve is 400mm.
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. Maintain 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 (2) or more datum points occur on one elevation, fixing should begin by working away from these points as previously described. If necessary, at a convenient position a slip flashing may be introduced to provide any required adjustment.
These are added at the midspans of the sheets to ensure weather-proofing for support spacings over 900mm for roofs and 1200mm for walls. Sufficient side lap fasteners are to be added to ensure absolute weather tightness on the bends. Use No 8x12 Hex Head Type S Self Drilling Screw with Neo. Washer or blind rivet.
NOTE: Minimum recommended radius to crimp is 550mm.