Corrugated is the traditional and familiar S-Rib profile for roofing and cladding applications. It is the oldest and most commonly used roofing profile because of its easy handling and fixing properties and related strength. The 8.5/76 stands for 8.5 corrugations over the width of the sheet and 76 refers to the distance in millimeters between two consecutive curves. The Corrugated profile virtually eliminates oil canning and the sheeting can be factory cranked, curved and bullnosed to various radii depending on customers ’ requirements. The overall width of an 8.5 Corrugated sheet is 700mm and that of a 10.5 Corrugated sheet is 840mm
IBR is a square fluted profile with an effective covering width of 686 mm, 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. Structural guidelines IBR 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 dependent on other factors such as the prevailing winds in a certain area. We therefore recommend that an engineer be consulted to determine the purlin spacing for a specific application. ROOF SHEETING IBR Narrow Flute Broad Flute 102 mm (± 2mm) 171,5mm (± 2mm) 35mm
Widespan is a roofing and cladding profile designed to provide an economic alternative to deeper Box Rib profiles without losing the aesthetic appeal of a square fluted profile. The trapezoidal Widespan profile 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. Structural guidelines Widespan 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 dependent on other weather factors winds . The structural properties of the various material options can be summarized as follows: WIDESPAN ROOF SHEETING Narrow Flute Broad Flute 119mm (± 2mm) 190,5mm (± 2mm) 23,25mm (± 2mm) 762mm Effective cover (-0+5mm) 800mm Overall width (-0+5mm) No Rib Rib
Water-carrying capacity. The trough-depth of 41 mm enhances the water-carrying capacity of the sheet and makes low roof pitches possible. Security. As fasteners are concealed, roof sheets cannot easily be removed from outside. Economy. The narrow width of the sheet reduces wastage, or the necessity for cutting of sheets, thus saving on material and labour. Profiling. Craft-Lock® sheets can be profiled on site to reduce transport costs and to eliminate transport damage. Re-usable. Another unique advantage of Craft-Lock® sheets is that they can be re-used. If a building is to be demolished, the hold down clips can be removed to recover the roof sheets. Re-use is possible as there are no holes in the sheets. Corrosion performance. As the side lap contact area of the profile is minimal and is well ventilated, trapped moisture cannot remain and the danger of overlap corrosion is eliminated. Accessories. All accessories such as closures, poly-closures, ridge capping, fasteners, sealant, etc. necessary to complete the most intricate roofing project can be ordered from the suppliers.
Chemvet also provides top roof finishing solutions through the use of Chromadek® For colour-coated steel roofing, Chromadek® is the material of choice. It is designed to be lighter and stronger than non-steel roofing. This saves on the roof structure, construction time and ultimate cost. It is a versatile and aesthetically pleasing option that can be used for various roofing and cladding applications. The Chromadek® paint system is specifically made for the African climate and provides you with improved gloss and colour retention, which ensures longevity, as well as a heat reflective colour range, which enhances energy efficiency. Chromadek® is the ultimate choice for rural, industrial (mildly chemically polluted) and moderate coastal conditions.
Through Clotan Steel’s range of flashings and rainwater products, Chemvet supplies you with a wide variety of flashings, unique to your requirements, and a range of standard (3m) length rainwater goods to ensure that your roof drainage needs are met with specialised service and technical expertise.