is the top covering of a building
. Flat roofs are often covered with tar
and provided with drains to run off rain
. Variously shaped roofs are built to naturally shed water. These include straight, curved, and hipped styles. Some building styles, for example, geodesic
and A-frame, blur the distinction between wall
and roofs. Pitched roofs are often covered with asphalt shingles
(in the US
) although thatch
, wood shake
roofs are common elsewhere. Newer systems include solar shingless
which generate electricity
as well as cover the roof.
Several systems of construction transmit the weight of the roof to the walls of the building and tie the roof into the structure. These include: king (queen) post, truss, rafter
By extension one can speak of the roof of a tent, automobile, etc. A convertible is an automobile built with a folding, retracting, or removable roof.