Roof Ventilation

GAF- Mastering The Roof (chapter 02) Danger signals of a poorly installed roofing system don’t have to appear only on the roof or ceiling. For example, poor attic ventilation can result in excessive moisture which leads to blistering and peeling of exterior paint. A faulty roof structure poses a threat to both the home and its occupants. Water damage, mold, and rot are just a few of the risks associated with a failing roof. In this section we are going to identify a variety of different problems associated with roof damage and defects. Leaking is obviously one of the most common signs of a failing roof system, You often see these signs in an attic after a heavy rain. The leaking may be caused by inadequate underlayment or deteriorated flashing. Another leak indicator is the appearance of stains on interior ceilings and walls. These leaks are often caused by ice damming, which forces water under the shingles at the eaves. Danger signals of a poorly installed roofing system don’t have to appear only on the roof or ceiling. For example, poor attic ventilation can result in excessive moisture which leads to blistering and peeling of exterior paint. Another danger signal associated with poor attic ventilation may be decay of roof shingles, sheathing, or siding due to excess moisture under the roof deck. Discoloration can also indicate a loss of granules due to the age of the shingles, which in turn can result in accelerated aging and ultimate failure. Another danger signal is missing, cracked or curling shingles. Although asphalt shingles give many years of service, they do eventually wear out.