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,

Ridge vents for corrugated metal roof? Corrugated Roof. I m installing a galv corrugated metal roof on my shed and am having difficulty finding a ridge vent. I know at least several companies make ridge vents for standing. Custom Roof Curb Manufacturer Thybar Manufacturing Custom Sheet

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