Do I Need Roof Ventilation?


Do you need roof ventilation? The simple answer is yes. Whether you live in a hot or cold climate, proper roof ventilation is a must.

Roof ventilation allows your home to be more energy efficient, protects your roof from rot, and can decrease the temperature in your attic during the hot summer months. Proper roof ventilation requires an even balance.

Too little ventilation causes excess moisture collection, leading to rot, mold, and a compromised roof.

On the other hand, too much ventilation can compromise the integrity of your roof and make it more susceptible to damage, like strong winds blowing off shingles or heavy rain causing roof leaks.Another advantage of asphalt shingles is that they come in a wide variety of colors and styles, so achieving a particular look is relatively easy to do. Gone are the days when everyone just chose boring, ho-hum, standard black asphalt shingles… you can easily make your roof stand out from the crowd with an interesting color or style choice. We sell and install roofs of the following brands: CertainTeed, Owens Corning, and GAF. 

Proper roof ventilation requires an even balance.

Have you ever noticed water condensation on the windows inside your home? If so, you may not have proper roof ventilation. The average home produces somewhere between 4 and 5 pounds of water vapor every day. This moisture may first be visible on your windows, but that is not the only place it is collecting. 

The water vapor also collects less noticeably on your ceiling and in your attic, which eventually will lead to wood rot and mold.

Good roof ventilation helps prevent moisture from collecting in your home, which in turn protects the integrity of your roof, ceiling, walls, and the entire house.

Proper roof ventilation can also help keep your attic from reaching extremely high temperatures during the warm summer months.

This does NOT mean that roof ventilation will keep your attic cool or air conditioned. The average temperature of your attic during the summer should not be any hotter than 10 to 20 degrees above the outside temperature at any given time.

Therefore, if it is 95 degrees outside then your attic should range anywhere from 95 to 115 degrees. Proper roof ventilation should keep your attic fairly close or just above the outside temperature.


One very important fact about appropriate roof ventilation is that it varies depending on the roof and the climate. An experienced roofer in your area can assist you with recommendations and ventilation options that will work best for your climate and your particular roof.

Regardless of climate or roof style, two facts that lay true across all types of roof ventilation systems are as follows:

  1. You need one square foot of ventilation for every 300 square feet of attic floor/ceiling space.
  2. The ratio between intake and exhaust ventilation needs to be exactly 50/50 for the roof ventilation to be most efficient.

When roof ventilation is working properly, the intake ventilation is effectively moving cooler and dryer air into your home while the exhaust ventilation is moving the warmer and wetter air out of your home. Efficient roof ventilation is achieved with these two are working in sync and sharing the load of roof ventilation at 50/50. Intake vents include soffit (or undereave) and rooftop intake. A soffit vent rests under the eave of your roof, while the rooftop intake sits on the top of your roof.

Exhaust vents are more varied and include static exhaust (or ridge/hip and roof louvers), power exhaust (or gable and roof mount), and mechanical (wind turbine).

The main differences between exhaust vents are as follows: Static exhaust uses the natural flow of air outside, power exhaust uses electric or solar power, and mechanical uses the wind as its source of power.

Selecting the best roof ventilation for your home will lead to an energy efficient home and increase the longevity of your roof.

We know what types of roof ventilation work best for the Lowcountry as well as for different roofing materials and shingle options.

BB Roofing has over 20 years of experience with providing effective and efficient roof ventilation to the roofs of the Lowcountry. We know what types of roof ventilation work best for the Lowcountry as well as for different roofing materials and shingle options. Our vast knowledge of both replacing and repairing existing roof ventilation allows us to give you the best quote and follow through with the best roof ventilation for your roof. Proper roof ventilation increases the life of your roof, makes your home more energy efficient, and keeps your attic at a more stable/consistent temperature year round.   

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