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,

Nancy Crow Artist Teacher Art Quilt Class, Crow. Nancy Crow s web site features images of her quilts plus information on her art/craft tours Peru, Guatemala, Mexico, & South Africa and workshops. The Crow Timber. IDB Chaglla hydropower plant in Peru IDB loan for Chaglla hydropower

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