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,

L&I News Center Washington May 22, 2015. Unregistered contractor in Vancouver ordered to pay state $72,000plus. A Vancouver road paver who admitted he had no contractor s license nor insurance. Asphalt shingles flashing requirements The edge on the. Asphalt shingles flashing requirements The edge on the

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