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,

They re About to Tear the Roof Off Downtown s Macy s. The roofripping will begin with the the removal of the glass canopy that shelters the central area off Seventh Street—the glass is scheduled come out. M Summary for Macy s Inc Common Stock Yahoo!

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