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,

Hobbema Oberlin College Allen Memorial Art Museum, Oberlin Main Street Oberlin 440.775.8665 Weltzheimer/son House Wikipedia, the free encyclopedia The Weltzheimer/son House is a Usonian style house designed by Frank Lloyd Wright in Oberlin, Ohio. Now owned by Oberlin College, it is operated as. DuoGard Vertical Glazing,

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