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,

Public Building Commission of Chicago Federico Garcia. Project Federico Garcia Lorca Elementary School AddressNorth Springfield Community Avondale Ward 30 Description LEED Certified GOLD This project will. Post and Beam Construction Building with Wood Post and beam framing is a simple framing style with main carrying members

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