A properly ventilated roof is necessary for the health of your roof and home. A well-ventilated roof regulates attic temperatures, keeping the space cooler in summer, reducing stress on your air conditioner, and lowering your energy costs.
In the winter, a well-ventilated roof allows rising warm air to escape, which melts snow on the roof and discourages the formation of ice dams. Proper ventilation also reduces moisture buildup (which prevents water damage, rot, mold, and mildew), discourages pest incursions, and improves air quality inside your home.
What Is the Best Way to Ventilate a Roof?
The most effective way to ventilate a roof is with a balanced ventilation system that combines soffit (intake) vents and ridge (exhaust) vents to promote airflow. These systems often include electric, solar, or turbine powered mechanical vents to remove heat and moisture from the attic.
Soffit vents are installed along the eaves where they allow fresh air to enter the attic space. Ridge vents are placed along the roof’s peak to allow warm, moist air to escape.
In homes with gable roofs, balance may be achieved with dual purpose intake/exhaust gable vents placed on the gable ends of the roof. For homes where the soffits are inaccessible, fascia vents may be an effective substitute for soffit vents.
What Is the Rule for Roof Ventilation?
The International Residential Code standard for roof ventilation is the 1/150 rule: one square foot of net free ventilating area for every 150 square feet of attic space. This ensures that enough air can flow through the attic to prevent temperature extremes and moisture buildup. Local building codes may have different requirements, and there is a 1/300 exception for ventilation systems that meet certain specifications.
Can You Have Too Much Roof Ventilation?
If your system is poorly designed, improperly installed, or unbalanced, it’s possible to end up with too much ventilation. This can lead to poor airflow, moisture buildup, mold, mildew, pest infestations, ice dams, and roof damage.
Are Ridge Vents Better Than Box Vents?
Ridge vents are generally considered superior to box vents. They vent a larger area, have better airflow, are more aesthetically pleasing, and are less likely to leak. The downside is that they are more difficult to install and cost more than box vents. Which option is better for your home depends on your budget, type of roof, and local climate.
How Do You Ventilate an Existing Roof?
If your current roof is unventilated or under ventilated, you can add new or additional vents to bring the airflow into balance. Depending on the type of construction and other variables, you will need to install the appropriate types of intake and exhaust vents. These must be placed evenly throughout the attic, following the 1/150 rule. Because of the complex calculus required for proper ventilation, it’s wise to consult an experienced roofing professional to guarantee that the job is done right.
Ensuring Your Roof is Properly Ventilated for Years to Come
The Simpson Roofing Company can inspect your roof to ensure that it is receiving proper, balanced ventilation, and if not, make any modifications necessary to protect your home and extend the life of your roof. We are a family company, committed to providing exceptional roofing services in the tri-state area for over a century. We offer residential, commercial, specialty and custom roofing, as well as property maintenance services. Call (973) 794-3500 or contact us online for additional information or to request a free estimate.
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