The ever popular inverted box rib profile (IBR) was introduced in SA by GRS HH Robertson and is available in two cover options, IBR 686 and Supaclad IBR 890. The trapezoidal flute design offers the optimum strength, mass and load-span characteristics compared to alternative profiles. These are supplemented by a full range of other pierced fix profiles from Corrugated sheeting to BR7, providing a wide range of options for every possible roofing and cladding application on a building project.