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 a Sears Modern Home? From 1908–1940, Sears, Roebuck and Co. sold about 70,000 75,000 homes through their mailorder Modern Homes program. Over that time Sears designeddifferent. Early hCentury Building Materials Siding and Roofing Highlights... Some roofing and siding materials commonly used on early hcentury

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