How Many Roof Vents Do I Need?

The construction of your roof plays an important part in determining how many roof vents you need. If your roof was installed with a vapor barrier you would need at least 1 square foot of roof ventilation for every 300 square feet of attic space. If you do not have a vapor barrier you will need 1 per every 150 square foot of attic. When it comes to the proper ventilation of your roof, it’s not just the number of vents needed but also the proper size and positioning of the roof vents.

The roof vents should be evenly spread throughout the roof and there should be a 1 for 1 ratio of inlet and outlet vents. A steeper roof will have more attic area and thus affect the amount of ventilation needed. Local building codes will determine the number of vents needed based on your attic’s Net Free Area (NFA) but the guidelines above are generally accepted. The professional roofers of Bay Roofing can help you answer the question “How many roof vents do I need?”

Why Do I Need Roof Vents?

For the best possible protection for your home, your roof needs to breathe. When air is trapped under your roof, costly and dangerous problems can develop. Water infiltration is a huge problem for any wooden structure so a properly ventilated roof will help prevent moisture buildup that could cause the formation of mold and mildew.

A well-ventilated roof keeps the attic temperature more consistent which improves your home’s energy efficiency. This regulated temperature also protects you from ice dams in the winter. When air can flow freely beneath your roof, you will maintain the strength and extend the life of your roof.

Types of Roof Vents

Roof vents are more than stacks that come out of the surface of your roof. They can exist in many other areas and in various forms. Each provides ventilation whether for air intake or exhaust.

Professional Roof Ventilation Installation

Ridge Vents

Running along the edge of the roof, ridge events are long and narrow and are ideal exhaust vents. They allow hot air to easily escape.

Gable Vents

Providing airflow through the siding via decorative-looking triangles, squares, or rectangles, gable vents are found in the gables rather than the roof itself.

Soffit Vents

Located under the eaves of your roof, soffit vents are primarily intake vents. You can usually see them on just about every home in the area.

Turbine Vents

Protruding from the roof’s surface, turbine vents rotate as a wind-powered turbine that sucks air from inside the attic.

Other Forms of Ventilation

You can also install a powered roof vent, sometimes in conjunction with an attic fan that you can control manually to ventilate your roof.

Professional Roof Vent Installation

Installing roof vents is usually done by a professional roofer when your new roof is installed. If you think that you do not have proper roof ventilation, contact the experts at Bay Roofing to provide an inspection of your roof to determine any necessary changes to your roof’s ventilation.