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,

Roof Leak Repair Tips Bob Vila When asphalt shingles are your roofing material, roof leak repair is a simple matter of locating the problem, then eradicating it. How to Repair a Leaking Roof MOTHER EARTH NEWS You can learn how to repair a leaking roof. Here

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