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,

Eastman Roofing & Waterproofing Inc. Buena Vista San ews of Eastman Roofing & Waterproofing Inc. "Eastman roofing is one darn good roofing company. They have excellent staff. Their estimators, inspectors, project. Perkins Eastman Press Releases New York, NY April 24,International design and architecture firm Perkins Eastman

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