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,

Commercial Roof Panel Machine CRPM Zimmerman Metals. OVERVIEW Patented Material Handling System Independent drive system is always centered on the panel coupled with free spinning forming rollers Roof Drain With Dome And Gravel Guard Commercial. Product Number Size Description UPC Qty Weight; 78012 2" PVC Roof

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