| Clotan Steel 10½ Corrugated sheeting is the traditional and familiar
S-rib profile for roofing and cladding with a 762mm effective covering width.
It is the oldest and most commonly used roofing profile because of its easy
handling and fixing properties and related strength. The S-rib is derived from
the sinus curve and offers very strong structural properties The corrugated profile virtually eliminates oil canning and the sheeting can be factory cranked, curved and bull nosed to various radii depending on customers' requirements Clotan Steel Corrugated sheets are available in standard lengths of 1.8 to 14m although lengths up to 20m are available on request. The permissible length tolerance for the standard length range will be -0 +5mm. Sheets outside these parameters are available on enquiry and might be subject to special pricing arrangements The maximum height that can be transported is 4.3m. This factor should be taken into account when bull noses and curves are designed The recommended pitch for roof slopes in excess of 15m is 10° and for slopes less than 15m is 7.5° Galvanised flashings are available in thicknesses of 0.4, 0.58, 0.8, and 1.0mm Chromadek finished flashings are available in thicknesses of 0.58 and 0.8mm Zincalume and Colorbond finished flashings are available in 0.6mm thickness Bullnosing Bullnoses and centre cranks can be manufactured in radii ranging from 350 to 800mm for bullnoses which are bent through 0 - 135°. Larger radii will be classified as a curve The maximum sheet length that can be bullnosed is 15m with a maximum height of 2m. The minimum run out from the bullnose is 30mm on one side with a minimum of 500mm on the other side of the sheet. It is important to clearly identify the critical end of the bullnose in order to ensure that consistent lengths are supplied The maximum height of centre and off-centre cranks that can be manufactured is 2m with a limitation of 10m total sheet length. These limitations are due to handling and transport limitations High tensile material (550MPa) can only be bullnosed and cranked to a minimum radius of 450mm Smooth curving In addition to the other processes above corrugated sheets can be curved using a rolling process to achieve a smooth rolling finish on the sheet. High tensile material (550MPa) is not suitable for curving due to the hardness of the material. It is therefore essential to use only 0.58 and 0.8mm material for smooth curving The minimum radius for curving on a 0.58mm ISQ300 material is 900mm and on 0.8mm ISQ230 material 600mm. When tight bend radii are specified, edge ripple on the roof sheets might prevail. When only a part of the sheet is curved or bullnosed slight crease marks on the sheets can be expected. Sheet length is limited to 10m with a maximum height of 2m Springing of profiled sheets For roofs gently curved on elevation, sheets may be sprung on site. However, extreme caution should be used when attempting this procedure to prevent buckling or canning. The minimum radius for on site springing of corrugated sheets is 30m
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