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,

Asbestos Awareness Program Radford University Asbestos Awareness Program. 1.0 Purpose The purpose of this program is to provide information about asbestos, the potential health effects associated with exposure. Occupational and Construction Safety Radford University The Office of Environmental Health, Safety, and Risk Management provides detailed information

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