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,

Flat and Pitched Roofs Leister Plastic Welding Various materials and systems are available for sealing flat or pitched roofs. The majority of the materials processed to this end around the world consist of plastic. Berridge Manufacturing Co. — Manufacturer of Standing Seam. Berridge ZeeLock standing seam

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