Typical of valleys lacking schistose rocks, that is easily split into slabs (lose), the roofing in rye straw was particularly widespread in all the Monregalese valleys, in Val Vermenagna and in Valle Stura. The stems were grouped in bundles and fixed to the roof framework to create fairly durable and highly insulating covers. The pitches of the roof were much more sloping than those of the roofs made of slate, since the light framework could not have supported the weight of large accumulations of snow.