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,

MERIDIENx12 Charcoal #77 Hard Top. MERIDIENx12 Charcoal #77 Hard Top Sun Shelter, Aluminum Structure, m Polycarbonate Roof,Tracks, Mosquito Netting Included Patio, Lawn. Garage Industrials There is an update to this video, these are no longer the fans I have installed. This

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