The latter necessitated the use of spouts to lead the water away over the top of the walls (e.g. as at Andernach's Alter Krahnen).
In this case the cone roof was surrounded by a defensive wall, a parapet or a battlement.
Such conical roofs were usually constructed using a timber-framed support structure covered with slate; more rarely they were made of masonry.
[3] Today, conical roofs are more often used in rural areas either for circular or small square buildings.
[5][6][7] A key feature of the Solomon Islands Parliament Building is its conical roof.