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IN DEPTH: Roofing

Ventilation Use Expands
Ventilation has become a key component of the roofing system, whether asphalt or metal products are used. The variety of options, including electrically and solar-controlled vents, continues to expand. “Ventilation products are growing because building science has been embraced, and it’s becoming a defining point,” says GAF’s Avitabile. “Science related to roofing is lagging behind walls, but it’s coming quickly now.”

As awareness of ventilation’s benefits grow, the need for more ventilation conflicts with homeowners’ goals in using roofing to add curb appeal. “Ventilated roof systems are growing in popularity, and it’s an area that’s ripe for change for many reasons, including efficiency and health,” says Huber’s Flotkoetter. “We’re seeing more companies create thicker roofing with layered roof systems that have vents built between the panels. Roof decks with layers of furring or battens allow shingled layers beneath and add insulating qualities.”

VentSure-RidgeCat-Rolled-Ridge-Vent---Owens-CorningThe VentSure RidgeCat Rolled Ridge Vent from Owens Corning is part of the company’s Total Protection Roofing System. The nylon entangled-net structure is said to be more than 50% lighter than other rolled-vent products and comes in 20-foot rolls that lay flat when unrolled. It flexes to be laid over the ridge with a double-density compression edge that adds strength.

Benjamin Obdyke’s McGill agrees. “The emphasis on aesthetics is affecting ventilation usage,” he says. “Architectural shingles up the ante, so the roofing becomes just as important as what goes on the walls. So contractors try to hide ventilation to improve the aesthetics of the roofline.”

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The challenges multiply for re-roofing projects, notes Owens Corning’s Burkett. “Providing the proper amount of ventilation can be a complicated formula. Contractors often deal with systems that are already in place, and they have to determine if they’re sufficient. They often aren’t.”

Master-Flow-Green-Machine-High-Power-Solar-Roof-VentThe Master Flow Green Machine High-Power Solar Roof Vent from GAF can differentiate a contractor’s business. The vent offers 750 cfm maximum airflow and installs virtually the same as typical electric-power roof vents. Its impact-resistant construction helps withstand hail and foreign-object impact, and it comes with a six-year limited-lifetime warranty.

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