In the summer, improperly vented attics can result in higher energy bills and premature aging of one’s roof material. Within the winter it can bring about moisture to accumulate within your attic and lead to mildew as well as mold problems. Should you ask ten different roofing contractors about roof ventilation you may most likely get ten different answers. And chances are, not 1 of those contractors can tell you which ventilation seminars they have attended. Their opinions are loosely formed around hearsay. Some widespread ventilation myths that misinformed contractors are guilty of spreading are: -You can add ridge vent towards the existing ventilation system. No. Please read more to do with Attic Mildew.