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,

Verso to sell Bucksport mill for $60 million to recycling. BUCKSPORT, Maine — Verso Paper has reached an agreement to sell its Bucksport mill and related power generation assets to a subsidiary of the Montrealbased. News Waste Management World 28/05/2015 Onlyout ofwaste incineration plants in China

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