Intake and exhaust vents are essential components for maintaining proper ventilation under your roof, especially when applying a silicone roof coating. These vents help circulate air, preventing moisture buildup and excessive heat that can damage roofing materials and reduce the coating’s lifespan. Proper sizing depends on the total roof area—usually around 1 square foot of net free vent area per 150 square feet of attic space is recommended. Intake vents are typically placed low near the eaves or soffits, allowing fresh air to enter, while exhaust vents sit higher up near the ridge or roof peaks to let hot air escape. To check if your vents are correctly sized and positioned, you can assess attic temperature differences on a warm day or inspect the roof deck for signs of moisture or mold. Simple DIY checks include measuring the dimensions of existing vents and verifying that intake vents are not blocked by insulation or debris.
When preparing to apply a silicone roof coating, it’s best to confirm that ventilation is adequate to protect the underlying roof system. If you notice uneven temperatures, condensation, or signs of water damage, it’s time to call a professional roofer or ventilation specialist. When speaking with a contractor, you can ask, “How do you calculate the required net free vent area based on my attic size?” and “Can you recommend optimal placement for intake and exhaust vents to ensure balanced airflow with my existing roofing system?” Keep in mind that ventilation design interacts with roof warranty terms and local building codes, so be sure the contractor is familiar with these requirements to avoid any unintended warranty voids or code violations. Proper vent sizing and placement will extend the life of your silicone roof coating and protect your home from moisture and heat-related issues.