As summer continued so did rapid progress. By the third week of July the supporting structure for the roof was complete. Although the original barn had an effective roof the whole structure had to be replaced as many of the supporting beams were rotten. Building a roof in the Alps is no simple task, the weight of snow is considerable so strength is vital. Each roof also has to be equipped with "snow catchers" which are designed to prevent large slabs of snow sliding off the roof when the temperature rises.To improve light inside the building the design incorporated velux roof windows and sun tubes which both required accommodation in the roof without impacting the integrity.
