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,

EPDM Warm Deck Roof Design Rubberoofs, Coventry, UK. Warm Deck Roof Designs for EPDM. The Warm deck roof design is the modern construction method for flat roofs and is preferred wherever this option is possible. Flat Roof, Rubber Membrane Roofing Rubberoofs. Flat Roof and Leaking Flat

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