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,

Nystrom Contracting Corporation Roofing Siding Window. Nystrom Roofing & Construction services the greater MinneapolisSaint metropolitan area in addition to the following cities Andover, MN, Anoka, MN, Apple Valley. Twin Cities Roofing Contractors, Roofing Company, Roofers, Twin Cities Contracting Services is a licensed and insured roofing

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