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,

Second City Roofing & Construction Chicago Roofing. Second City Roofing, a renowned Roofer in Chicago. Get the best value on Chicago roofing services, and warranty on the highest quality roofing and home improvement. Norwich Wikipedia, the free encyclopedia Norwich is a city on the River Wensum

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