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 t Street Harbor Date Description; 4/13/2010 PBC Board of Commissioners Approve Contracts for Construction of New t Street Harbor 6/7/2012 Chicago Park District Opens Newest. Timber Frame Craftmanship Timber Frame Roof Structures Timber Frame Weathered Wood Barn This barn in southern

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