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,

Better Business Bureau. Start with Trust® BBB Greater. To receive an unsatisfactory rating, a business either has not responded to one or more customer complaints, or has not made an adjustment that the Better Business. Build Your Own Home and Save! DIY MOTHER EARTH NEWS Build

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