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,

What Is Galvalume Roofing? eHow What Is Galvalume Roofing?. Galvalume is a type of steel roofing developed from overyears of research by Bethlehem Steel, and now BIEC International, Inc. Galvalume Roofing Costs Prices for Galvalume Metal Roof. The Costs. Lowest Cost $35 persquare feetfeet byinches Highest

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