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,

Dewitt Products Roof Cement, Roof Coating, Foundation. Roofing, Waterproofing, and Driveway Sealers . Since 1931, Products Company has been manufacturing asphalt roof coatings, roof cements, aluminum coatings. Iossi Siding &Windows Inc. Quad Cities Roofing, Siding. Iossi Siding and Windows is proudly serving the Iowa and Illinois

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