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,

Metal Roofing Prices Cool Flat Roof MA Metal Roofing Prices. Although prices differ from region to region, metal roofing prices are more stable and uniform, compared to the cost of asphalt shingles. The Elmer H . Garinger High School Historic Landmarks. The Elmer H. Garinger High

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