3 reasons why roof ventilation is important

You probably already know the basics of ventilation. It’s pretty simple: ventilation is the flow of air through a system of intake and exhaust. So why is ventilation important when it comes to your roof? There are three main reasons, but before we dive in, let’s review the basics. The need for roof ventilation wasn’t documented until the early- to mid-20th century. That’s when organizations like the American Society of Heating, Refrigerating & Air-Conditioning Engineers (formerly ASHVE) and Forest Products Laboratory recognized that building condensation problems could be caused by poor roof ventilation. The stack effect occurs when hot air rises and creates a higher pressure at high points in the attic. Hot air that escapes is known as exhaust. However, this hot air cannot escape without an inlet for cooler, low-pressure air. Cool air that enters is referred to as intake. When the wind blows against the outside of a roof and increases the volume of intake and exhaust, it is known as the wind effect. Intake and exhaust generate the natural flow of air to create a well-vented attic.

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