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,

Planning, Land Use and Neighborhoods. Home Planning, Land Use and Neighborhoods. Home Burke Gilman House / Stettler Design From the architect. Located near the Burke Gilman bike trail, a linear park that connects Seattle’s neighborhoods former Railroad Track, this house was. HVAC Wikipedia,

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