Attic & Roof Ventilation

One of the most important but little-known aspects of proper roofing installation is adequate ventilation. There are numerous reasons why ventilation is essential when it comes to roofing. Things like the growth of mold, heating and cooling costs, and even the life of your roof are all impacted by ventilation. When determining how much attic & roof ventilation to install, the general rule of thumb most contractors abide by is 1 square foot of ventilation per 300 square feet of attic floor space.

Attic & Roof Ventilation

What type should I have?

Without seeing your home’s roof it is hard to say what type of venting you could benefit the most from. There are many venting options and they all work exceptionally well in certain situations while providing little benefit in others.

One thing to note is that the trend currently is to provide more ventilation (in the right spots) than in older homes. Building codes have changed such that more insulation between the living space and the attic is required and more ventilation in the attic space is required.

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Exhaust Vents

This type of ventilation allows air to flow out of your attic and keeps unwanted temperatures from building up below the roof deck. Generally, there are three types of exhaust vents used in roofing.

Gable vents, or wall louvers, are located in the gable ends of the attic and can be used in combination with other vents.

Gable vent

Ridge vents run along the peak of your roof. They include a cover (baffle) to protect rain and snow from coming right into your attic.

Wind turbines are mushroom-shaped caps atop roofs designed to catch natural wind currents, which spins an internal fan and propels hot air out of the attic. Wind turbines are most effective in areas where winds average about 5 mph.

Turbine vent

Intake Vents

Exhausting air is only part of the ventilation equation. You also need intake vents, which help to keep the air flowing through the exhaust vents. Without an intake, the exhaust vents cannot fully serve their purpose. There are generally two types of exhaust vents used in roofing.

Box vent

Static vents have no moving parts. These can be box vents, dormer, roof louver and many others. At their core, they are protected holes in the roof decking.

Soffit vents provide a breath of fresh air.  Made of aluminum or vinyl, they contain tiny perforations or slits for airflow. Soffit vents are most effective when used in combination with a ridge vent.

Soffit vent

Ventilation Maintenance

You or a professional roofing contractor should inspect your roof vents once per year to ensure that no blockages have occurred and your roof is ventilating properly.

  • Periodically remove screens of dust, dirt, spider webs, leaves and other bits of nature that restricts the flow of air
  • Fix rips or tears on any screens or flashing
  • Looks for rust or rot around the flashing
  • Move insulation away from soffit vent openings

If you notice ice damming, mold or moisture in your attic, have a roofing professional review if you have enough ventilation.

Trust The Roofing Experts At Pro

Pro is a gutter contractor with more than 14 years of experience with installing beautiful and affordable roof replacement on homes all over Michigan. We also feature an industry-leading warranty meaning you can rest assured knowing we guarantee all aspects of the install. We are based in Ferndale, but we regularly complete roofing projects in places like Detroit, Ann Arbor, West Bloomfield, Metamora, and even Flint!

Pro Home Improvement is dedicated to providing our customers with the best replacement roofs in Michigan. This is why we are sure to install the proper amount of utilize attic & roof ventilation on every project. If you would like more information on our roofing services or to schedule a roof estimate, call us today at 888-776-1998.

What Our Roofing Customers Are Saying

  • Good estimate, with excellent analysis of the current roof. Not a lot of sales pressure, but great education and information. Reasonable price after minor negotiation against other written estimates. Painless scheduling and completion of the new roof, on time, despite a day down for rain. I'd recommend without question, especially if warranty and follow up inspections go on time in the future as advertised.

    — Thomas in Port Huron, MI

  • There are MANY things about Pro Home Improvement, Inc. I would like to hi-lite: 1. Every aspect of the roofing project, from the salesman coming out and measuring the site and showing the products offered, to the work crew actually doing the tear-off and installation, to the office personnel, were EXTREMELY professional and friendly. 2. The cost of the project was very competitive compared to other companies, with very good materials offered. 3. The staff and work crew went well "beyond the call of duty" in their services and ensuring the finished product met ALL of my expectations. 4. The job took two days (due to rain...), so the work crew took extra measures to ensure the home was protected from the rain when they left the job site on that first day. All of my property was kept dry. 5. When the work crew finished the job, they ensured they cleaned up the area prior to leaving the work site. There is absolutely NOTHING that did not meet and/or exceed my expectations from start to finish. I would recommend Pro Home Improvement, Inc. to anyone looking for professional, competitive, and friendly home remodel/repair jobs.

    — Gilbert H in Monroe, MI