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,

Contractor s License Reference Site This site features data from ilable from Craftsman Book Company Click on a State to See License Requirements or Find Out if A Contractor is Licensed in That. License Information for Roofing Contractor All contractors/builders must be licensed by the 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.