The roof is not made of wood, but like most old European buildings, its frame is made of wood. Above the vaults of stone, a wooden frame supports the roof whic

The roof is not made of wood, but like most old European buildings, its frame is made of wood. Above the vaults of stone, a wooden frame supports the roof which is covered with metal (zinc). This is obviously lighter, and easier to build and to maintain than a roof made of stone. Unfortunately, after a few centuries it becomes extremely burnable.