Abstract: Method and apparatus for providing an I.G. unit comprising at least two lites and a spandrel comprising a single lite for use in building construction, and especially for use as part of a building facing. At least one of the lites of the I.G. unit comprises a plurality of glass sections joined by at least one interposed joining member. Each I.G. unit is hermetically sealed and comprises a strength against wind load, atmospheric pressure changes, and other window stressing environmental factors which may be greater than a like sized, conventionally constructed I.G. unit. Each spandrel comprises a lite of similar appearance, construction, and strength against wind load to that of a lite for the I.G. unit whereby mechanical workings of the building between windows are concealed with lites of the spandrels providing substantially the same appearance and patterns as those provided by I.G. units on the visual areas of the building. The invention enables I.G.