At Chemvet we supply IBR roof sheeting also known as Inverted Box Rib. IBR is aesthetically pleasing, thus the reason this profile is so popular in upmarket estates. Homeowners are spoiled with choice when it comes to roof slopes, as IBR is ideal for roofs from 5° up to 50° roof slopes.
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 bull nosed to various radii depending on customer's requirements.
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 dependant on other factors such as the prevailing winds in a certain area, snow during winter periods, the presence of dust and other particles in industrial areas, the type of structure that is being erected, etc.
IBR sheeting is available in standard lengths of 1.5 to 14 m, although lengths of up to 20 m are available on request. The permissible length tolerance for the standard length range will be -0 +5 mm. Sheets outside these parameters are available on request and might be subject to special pricing arrangements.
When using IBR, the recommended minimum pitch is 7.5° for roof slopes in excess of 30 m and 5° for slopes less than 30 m. When IBR roof sheets are end-lapped the roof pitch should be taken into account. The minimum end laps for roof pitches in excess of 15° is 150 mm and for other roofs a minimum of 250 mm is recommended.