IBR (Inverted Box Rib), with an effective cover width of 686mm after a side-lap, is an angular trapezoidal fluted sheet designed for use as roof covering and side wall 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.