An awning is a secondary covering attached to the exterior wall of a building. It is typically composed of canvas woven of acrylic, cotton or polyester yarn, or vinyl laminated to polyester fabric that's stretched tightly over a light structure of aluminum, iron or steel or possibly wood. The configuration of this structure is something of a truss, space frame or planar frame. Awnings are also often constructed of aluminum understucture with aluminum sheeting. These aluminum awnings are often u… (More on Awning)