Different types of attic ventillation
Posted by Jacqi ragsdale on Thu, Dec 01, 2011 @ 08:59 AM
When installing a new roof or replacing an existing roof, the installation of attic ventilation is important. There are two main categories of ventilation, intake and exhaust vents.
Intake vents are usually located in or near the roof eave or below at the roof's edge. There are different types of intake vents, you can decide which is best for your house by looking at the structure of the house, where the units will be located, and the net free area provided by each unit.
Common types of intake vent include: undereave vents (mounted in the soffit), continuous soffit vents (mounted in the soffit), vented drip edge (used when there is no eave area), the Edge Vent Shingle-over (installed roof-top), mini-louvers (installed in exterior walls to help eliminate moisture), and vented soffit panels (vinyl or aluminum soffits with vent openings already cut into the panels).
Below is an example of an undereave vent mounted in the soffit vent.
Exhaust vents: Allow an unobstructed outflow of attic air, while preventing precipitation from entering in.
Common types of exhaust vents include: roof louvers (installed as close to the ridge as possible, and are round, square, or slantback), gable louvers (installed in the gable ends of the house), ridge vent (installed on the ridge of a house, lifts air out of the attic), wind turbines (uses rotary motion of blades that create an area of low pressure, pulling air from the attic), power attic ventilators (uses rotary motion of blades to pull attic air, but instead of wind, it uses electricity to drive motors).
Below is an example of a wind turbine.
