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,

Date of Incident,Company and Location,Preliminary. 6/14/2009,"Greensburg, ","Employees were throwing away old files. They had a dumpster on the forks in the raised position. In bringing the dumpster. Businesses by Category Kiel Area Association... About the Kiel Area Association of Commerce. The Kiel Area Association of Commerce

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