The main factor that may weaken the stability of the roof structure is dampness. On its negative impact it is particularly exposed rafter framing, which deform under impact of water. Therefore is important roof protection against getting in  water into its internal structure.

Typically, investors during the construction of the roof attach great importance both for building materials, as well as careful execution. Unfortunately, later very often they forget about the survey, and any minor defects  commission outsource cheaper and often non-professional roofing companies. This is a big mistake,

Awning Wikipedia, the free encyclopedia An awning or overhang is a secondary covering attached to the exterior wall of a building. It is typically composed of canvas woven of acrylic, cotton or polyester. Chevy Roof Racks & Cargo Carriers at Take advantage of Chevy roof racks

A very important element that must be considered when the roof is projected, is ventilation, allowing drainage of excess dampness from under the roofing.