“The flat roof has been an architect’s dream for four centuries. In the mid-nineteenth century, this dream was fulfilled. But once they had the flat roof, most architects didn’t know what to do with it.” These were the words of Adolf Loos, who in 1923 resignedly referred to an issue central to 1920s architectural discourse. Indeed, the introduction of manufactured roof sealants opened up new possibilities, while architects practicing in the Renaissance such as Leon Battista Alberti and Andrea Palladio had to make do with implying a flat roof – and the freedoms that go hand in hand with it – behind balustrades and cornices. Notwithstanding, a bitter disagreement on roof forms was ignited which developed into a deep chasm between traditionalists and modernists, not only among architects, but it subsequently also drew in the entire society. This is exemplified particularly clearly by the Weißenhofsiedlung in Stuttgart