The Saint-Antoine church in Granges-sur-Baume has a lava roof typical of the region. The traditional use of this material at hand, abundant, easy to extract and inexpensive is explained firstly by reasons of convenience but also for its aesthetic and functional qualities of insulation (sound and heat) and of adaptation to seasonal variations. In the past, each village had multiple small lava quarries and a wide variety of roofs were covered with them (residential houses, farms, dovecotes, washhouses, churches, etc.). The slope of the roofs had to be between 40 and 50° to support the heavy weight of this type of roofing (between 1,212 and 1,543 lbs / 550 and 700 kg per square meter), the load of which was shared between the head of the wall and the frame.