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,

Baker City, Oregon Wikipedia, the free encyclopedia Baker City is a city in and the county seat of Baker County, Oregon, United States. It was named after D. Baker, the only U.S. Senator ever killed in military. Frequently Asked Questions City of Baker City Building.

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