Why does Roof Ventilation Matter?

Originally posted on Men's Journal | By Emily Fazio | Last updated Aug 11, 2024 7:00 AM ET

Imagine stepping into your attic on a sweltering summer day — we don't actually recommend doing it without substantial hydration. Without proper ventilation, it can feel like an oven up there. Good roof ventilation prevents this by allowing hot air to escape, which helps keep your roof in top shape and your home more comfortable. It also minimizes moisture buildup that can lead to mold and mildew, protecting your roof’s structural integrity. Plus, with better ventilation, you’ll notice lower cooling bills, making your home more appealing to potential buyers.

"Making sure your roof is properly ventilated, especially during the summer months, can extend its life, potentially increasing the value of the home," shares Stephen Riale, CARE Area Manager at GAF. "Proper roof ventilation helps regulate the temperature of the home’s attic, preventing heat from building up which can cause roof materials to deteriorate faster."

He adds, "Proper ventilation also reduces moisture or water build-up, which can lead to mold and mildew growth which damages the roof structure."

A well-ventilated roof can also increase a home’s energy efficiency and reduce cooling costs, which can make the home more attractive to prospective buyers since they can potentially expect lower energy bills and fewer maintenance issues. Riale touts the GAF’s Attic Ventilation Calculator as a great resource for homeowners. "It determines the proper amount of ventilation based on U.S. guidelines and gives options for ventilation products to suit their needs and preferences."

Mechanical Ventilation vs. Power Vents

When deciding between mechanical ventilation and power vents for your roof, it's helpful to understand the benefits and limitations of each. Keep in mind that the best type of roof vent will depend on your specific climate, attic size, and ventilation needs, and a roofing contractor will be best able to help you weigh the options.

Mechanical ventilation relies on natural airflow, utilizing ridge vents, soffit vents, and gable vents to create a continuous flow of air through the attic. This passive system is energy-efficient, low-maintenance, and cost-effective. It's ideal for homes in moderate climates where natural ventilation can adequately manage heat and moisture.
Power vents use electric or solar-powered fans to force air out of the attic. These active roof vents are particularly effective in hot or humid climates where passive ventilation might not suffice. Power vents can significantly reduce attic temperatures and moisture levels, enhancing overall home energy efficiency. However, types of roof ventilation require a power source, can be more expensive to install, and may need regular maintenance to ensure optimal performance.

Other Things You Can Do to Maintain Your Roof During the Summer

Install a skylight. Or replace, or repair an existing skylight for added energy efficiency.
Invest in solar power – solar panels or solar shingles. There are still lots of incentives available for homeowners looking to embrace energy-efficient home systems.
Install a solar-reflective floating to protect the roof from heat.
Install a whole-house fan in your attic space. This creates negative pressure within your home and activates the ridge vents, soffit vents, and other intake vents to circulate hot air and reduce structural damage.
Schedule a roof inspection. It's a great time to check for damage around the valleys, gutters, and shingles.
Clean debris (including algae and moss) from the shingle surface.