Roof Ventilation Calculator: How to Find the Right Balance for Your Home
Roof Ventilation Calculator: How to Find the Right Balance for Your Home Why Roof Ventilation Matters Proper roof ventilation is one of the most overlooked yet essential elements of a durable roofing system. Without sufficient airflow, heat and moisture build up in the attic, driving up energy bills and leading to warped decking, mold growth, and premature shingle failure. In Texas—where heat and humidity push roof systems to their limits—balanced ventilation helps extend roof life, reduce cooling costs, and protect insulation from moisture damage. A roof ventilation calculator makes it easy to determine how much intake and exhaust ventilation your roof requires for optimal airflow. How Roof Ventilation Is Calculated Most roofing professionals follow the 1:150 rule , meaning one square foot of ventilation for every 150 square feet of attic space. If your home has a properly installed vapor barrier, you can use the 1:300 rule , which cuts that requirement in half. Balanced system...