IBR roof sheeting

Clotan Steel IBR sheeting is a square fluted profile with an effective covering width of 686mm and a 37mm deep trough designed for use as side cladding or roofing material in commercial, industrial and residential buildings. The name IBR is abbreviated from "Inverted Box Rib" and has become a household name in the South African building industry. The deep broad flute design offers excellent drainage characteristics combined with optimum weight versus load/span capabilities. IBR can be factory cranked, curved and bullnosed to various radii depending on customers' requirements

Clotan Steel IBR sheets are available in standard lengths of 1.5 to 14m although lengths of 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 bullnoses and curves are designed

The recommended pitch for roof slopes in excess of 30m is 7.5° and for slopes less than 30m is 5°

Widespan roof sheeting

Clotan Steel Widespan sheeting is a roofing and cladding profile with an effective covering width of 762mm and a 28.6mm deep trough designed to provide an economic alternative to deeper box rib profiles without losing the aesthetic appeal of a square fluted profile. The trapezoidal Widespan offers greater spans and lower roof slopes than corrugated sheeting but provides the same covering width, Widespan can be factory cranked, curved and bullnosed to various radii depending on customers' requirements

Clotan Steel Widespan is available in standard lengths of 1.5 to 14m although lengths of 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 bullnoses and curves are designed

The recommended pitch for roof slopes in excess of 30m is 10° and for slopes less than 30m is 7.5°

It is recommended that end and side laps on low pitch roofs are sealed to ensure water tightness

In the case of pre-painted sheeting the colour can be specified on either side of the sheet

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

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 to the customer

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

Due to the manual process involved bullnoses will be priced as curves when the radius exceeds 800mm. The maximum height of curves that can be handled is 2m with a maximum sheet length of 10m

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 radii for on site springing of profiled sheets are 40m for IBR and 35m for Widespan