How does roof line design effect a ventilation system?
Today’s roof scapes are very diverse; hips, gables, dormers, and other variances. These variances are crucial in determining the type of ventilation required. For example: Hip roof designs sometimes have short ridge runs (less than 20 feet). Ridge vents installed on this ridge would not provide the proper net free area required. Lomanco would recommend; Whirlybirds®, power ventilators, or roof louvers be used. Multiple gables also present ventilation dilemmas. Gables take away from the amount of under-eave-overhang area of a home. This area must provide for the under-eave or intake ventilation. Remember intake ventilation must be 50% of the ventilation system. Intake ventilation should be provided on dormers too. Exhaust ventilation for the dormer attic area can be provided by the main upper roofline to meet minimum property standards. If the dormer has a cathedral ceiling it must be vented with a ridge vent type product for exhaust. If the dormer has an attic space sealed off from the
