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,

Seattle Building & Construction Trades Council IUPAT District Council 5E Marginal Way S Seattle, Denis Sullivan, Business Manager Byron Shire News Central Queensland News Publishing Company Pty Ltd 2015. Unauthorised reproduction is prohibited under the laws of Australia and by international treaty. WA

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