The Corrugated profile virtually eliminates oil canning and the sheeting can be factory cranked, curved and bullnosed to various radii depending on customer's requirements. The overall width of a 8.5 Corrugated sheet is 700 mm and a 10.5 Corrugated sheet is 840 mm.
Corrugated roof sheets are available in a wide range of materials displaying various structural properties. It should be noted that the load span characteristics are only to be used as a broad guideline as purlin spacing is also dependant on other factors such as the prevailing winds in a certain area, the presence of dust and other particles in industrial areas, the type of structure that is being erected etc. We therefore recommend that an engineer is consulted to determine the purlin spacing for a specific application.
Corrugated sheeting is available in standard lengths up to 15 metres. The permissible length tolerance for the standard length range will be -+5 mm. Sheets outside these parameters are available on request and might be subject to special pricing arrangements. The maximum height which can be transported is 4.3 metres. This factor should be taken into account when bullnoses and curves are designed.
When using Corrugated iron, the recommended minimum pitch for roof slopes in excess of 15 m is 10º and for slopes less than 15 m is 7.5º. When Corrugated roof sheets are end lapped the roof pitch should be taken into account. The minimum end laps for roofs pitches in excess of 15º is 150 mm and for other roofs a minimum of 250 mm is recommended. End laps for side sheeting should be at least 100 mm. It is recommended that end and side laps on low pitch roofs are sealed to ensure water tightness.
The required number of IBR sheets can be calculated as follows:
The required number of Corrugated sheets can be calculated as follows: .
Number of sheets = Length of building + gable end overhangs - 76 mm / 0.762 m (Cover width of sheet)
Roof sheets and vertical wall cladding (side cladding) must be laid with one and a half corrugation side lap and shall be fixed through the crests of alternate flutes to purlins using 50 mm Top Speed or Tex screws into steel purlins and 65 mm Tex or Top Speed screws in the case of timber supports, all fasteners shall incorporate 19 mm dia bonded washers. Special fasteners should be used in the case of Zincalume Sheeting.