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,

Basic Quality Control Concepts – philosophe Quality control describes the directed use of testing to measure the achievement of a specified standard. Quality control is a formal as in structured, not as in. Minimum Wage vs. imum Ratio Conceptual Math Minimum Wage vs. imum Ratio understanding

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