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,

A New Mobile Home Roof and Insulation Cuts Energy Costs. A family discovers that putting a new mobile home roof and insulation in place pays off in more ways that one, including how they placed the roof and a cross section. Cost of Mobile Home Roofing

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