A common problem found on many existing roof systems are bathroom vents that are not properly exhausted. Bathroom exhaust fans must be vented out of the attic to prevent mold, moisture damage, and ice dams. Installing a dedicated vent with a damper on your roof along with an insulated duct in the attic which connects the bathroom fan to the roof vent installed on the roof, is the best solution for this problem. We often come across improperly vented bathroom vents blowing air into the attic unvented trapping moisture and heat in the attic. This easy correction is often overlooked by many roofing contractors who do not perform an attic inspection with their roof evaluation.