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,

FFA Chart IREF, French Family of Frenchpark, Roscommon Co. French Family Association. The Official Website of the Surname French. Frenchpark et House, Roscommon County, Ireland, built ca. 1840, now derelict. Ballaghaderreen, Co Roscommon, Ireland. Comhthionl Réigiún na Teorann, Lár Tíre agus an Iarthar The Square, Ballaghaderreen,

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