Roof ventilation uses various types of vents to remove heat and moisture by circulating air from the attic to the outdoors. The ventilation protects the home's roof and shingles from rotting as well as excessive heat and ice dams that can cause serious damage.
The recommended ventilation is at least 1 square foot of vent openings per 300 square feet of attic floor. A 1,200 square foot attic floor needs at least 4 square vent of vent openings. Less ventilation doesn't allow for sufficient air flow to keep the attic from overheating or becoming damp.
Roof vent types include ridge, static and gable vents. Ridge vents go on the roof peaks and have a covering to keep debris from entering. Static vents allow air to naturally circulate without any moving parts with protected holes in a line across the roof. Gable vents go under the roof deck on the gables of a home and work in unison with other roof vents.
Soffit vents boost the air circulation provided by roof vents. They go underneath the soffits so they are protected from weather elements. The vents have small holes or slits that allow the air to flow up into the attic space.
Wind turbines are another options in roof ventilation systems. The wind turbine goes on the roof and has an internal fan that turns from wind. It helps remove heat from the attic.