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,

Pages Speed Limit Increases September 29,Click on the regional map below, or use the text description links to the left, for colorcoded PDF maps highlighting routes and sections affected by the new legislation. Ohio from the US Census Bureau People Ohio USA; Population,estimate 11,594,163 318,857,056 Population,estimate

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