Attic ventilation is one component in a proper roof system. If the attic area doesn't have proper air flow your attic space will be prone to mold growth, shortened shingle lifespan and ice dams may form during winter cold snaps. In the following article I'll describe the most common way attics are ventilated today and a couple of ways to increase the airflow where necessary.
I'm often asked how many years a customer may expect to get from a roof systems installed on the home they want to purchase. Estimating, or perhaps a better term would be guesstimating the life of a roof system accurately is nearly impossible and most inspectors won't want to make such a statement. There are far to many variables to make any kind of reliable prediction. For example: