P.I. Roofing

Intake vs. Exhaust Ventilation

The basic idea of ventilation is to allow your roof and attic to breath. Similar to the needs of your own body, your roof also needs air to come into the attic and then go out to circulate the air and moisture in the attic.

Intake ventilation is classified as non-piercing ventilation – and is provided by gable or soffit vents. Gable vents are on the side of your house, usually under a peek, or gable, in the roof. Soffit vents are in the underside of your eaves, in the part of the roof that’s parallel to the ground. These vents help increase circulation in the attic to let your roof breathe.

Exhaust ventilation for your roof may pierce the roof or be in the walls under the roof or under the eaves. You may have ridge vents providing ventilation for your roof. These vents run the length of your roof peak, and have weather filters and baffles in them. They work with soffit vents to allow air to circulation. The other common types of exhaust ventilation is turbines, also known as whirly birds. Turbines may be wind-powered, solar powered or powered by electricity. Some come equipped with thermostats and even with a humidistat control to accommodate attic humidity levels. All these require flashing. It is important not to mix ventilation products but rather to use the right products for each situation. Ventilation is not a “one product fits all” solution, where you can just add any product, regardless of what your existing system is, and see a benefit.

Not sure if your roof is getting the right ventilation? Let us come out and provide a free roof inspection.