Ventilation is the flow of air through a system of intake and exhaust. There are three main reasons why roof ventilation is important. If you are getting a roof replacement, it is a great time to consider ventilation options.
Poor roof ventilation can lead to condensation problems. The benefits of proper airflow in a house was not appreciated until the early- to mid-2oth century. Airflow can be mechanical or natural. Whenever possible use the stack effect and the wind effect to naturally circulate air.
When hot air rises, it creates a higher pressure at high points in the attic. This is called the stack effect. The hot air that is able to escape is referred to as exhaust. The hot air cannot escape without a way for cooler, lower pressure air to enter. This is called intake. The wind effect occurs when the wind blows against the roof, increasing the amount of intake and exhaust.
- Extends roof life: Proper ventilation can extend the life of your roof. This is important if you are getting a roof replacement. You want it to last as long as possible. It can help prevent things like ice damming. This occurs when heat from your attic combined with heat from the sun melting snow on your roof. The water runs to the edge and refreezes. In the warmer months, the buildup of heat in the attic can cause damage to the shingles.
- Lowers energy costs: Proper ventilation can reduce the workload on your air conditioner.
- Reduces temperature extremes: Poorly vented roofs create an extreme degree of temperature change between floors of your home.
When you are getting a roof replacement, make sure your attic is properly ventilated. It is the perfect time to install vents and fans as necessary. Work with natural air flow when possible. In the summer, this ventilation can make an especially big difference.