Top Questions on Attic Ventilation


If you are replacing your attic ventilation or having a new roof installation done as part of your custom home build, then don’t neglect the importance of attic ventilation. Although all components serve their purpose, and often connect to other parts, attic ventilation has a way to being connected to some of your higher priority details as the consumer, energy consumption, cost, and even carbon footprint. Today we discuss the top five questions regarding the topic of attic ventilation.

The answers to the main questions that homeowners may have are common knowledge for all experienced professionals in attic ventilation.

Why Does It Matter?

Mother nature impacts your roof year-round, regardless of your location. Attic ventilation offers the benefits of withstanding heat buildup in the hot summer months, buildup of moisture in the cold winter months, and ice dams in the temperatures equating to snow and ice.

Seem insignificant or too basic? Well, attic ventilation helps extend the lifetime of your roofing materials like shingles. Attic ventilation is a top contributor to lower electricity bills, reduced load factor on your major appliances like your ac unit, fans, and refrigerators. Surely, you feel that impact in the heat of summer, and maybe it seems less apparent or even less impactful in the cold winter months. However, the truth is the significance of attic ventilation may be more important in colder conditions.

An average family unit of four persons generates an estimate two to four gallons of water vapor every single day by showering, cleaning, breathing, etc. Inevitably, some of the water vapor rises into the attic. In winter, the amount of water vapor that the air can hold is lower than in summer; resulting in condensation as frost or water droplets, dripping into the insulation, and in time, contribute to mold, mildew, wood rot and poor indoor air quality.

More Exhaust Fans Means More Benefit, Right?

The simple concept of more is better, isn’t so simple regarding mathematical impact or the physics of the build. Frankly, it depends on the type of exhaust fan. Increasing the number of exhaust fans on your roof, works so long as they are the same type and keeps the balance of intake. The five types of exhaust vents are: ridge vents, power fans (traditional electric and solar powered), wind turbines, gable louevers, and roof louvers. Don’t mix your types of exhaust fans, for the result could be a short-circuit in the attic ventilation system.

What About Multiple Ridge Heights?

Your ridge heights can vary and can run parallel or at an angle to each other, but if the space separating them is over three feet, only ventilate the higher one or separate the attics. The physics of wind speed, pressure zones, and height results in best practice of separating the attics with plywood or poly sheeting to create two distinct attics.

If you need new attic ventilation installation done, contact the contractors with G&R Roofing to schedule your repair or installation estimate today.