The usually horizontal covering of rooms or buildings. Simple roof construction usually comprised a horizontal bed of branches or beams, sometimes supported by columns, on which layers of earth or limestone plaster were laid. They weathered in the rainy season and needed to be restored in dry weather. Building roofs served primarily to give shade, to keep out rain or other foul weather, and to support a variety of activities carried out on rooftops, from sleeping to storage to sounding alarms. The law required that parapets be built around roofs to reduce the hazard of falling (