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,

500 Boylston Street Wikipedia, the free encyclopediaBoylston Street is a 1.3 million square foot PostModern building located in the Back Bay section of Boston and part of the city s High Spine, completed in 1989. Roofing Contractors in Worcester, Massachusetts with. Findlistings related to Roofing Contractors

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