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Lexicon IBR _____________________________________________________ Acronym for 'Inverted Box Rib'. The profile was first manufactured in the USA in 1914 and in Britain under American patent in 1918 for use as a walling and vertical cladding material. It was originally imported into South Africa in the 1950s. A local engineer, Thom WARREN realized the water-carrying potential of the material and patented the IBR profile as a roofing material. It was first used in this fashion on the wardens quarters of Leeukop Prison. The architect GRAFF came up with the innovation of covering the troughs with a lay-on ceramic tile, called 'Britti Tiles,' this both for aesthetic reasons as well as to circumvent by-laws where the use of galvanised sheetmetal as roofing material was prohibited this in itself a 'snob-value' restriction to meet the sensibilities of 'up-market' neighbourhoods! Anthony LANGE worked with Stanley KAPLAN in 1972 on cranking IBR roof sheets into curved eaves, introducing a new period of cranking deep sheet-metal profiling to create rounded eave-less box warehousing (Chipkin 2008:450). .