Ventilation by roof type

By The Coffee Shops™. 

Understanding the impact of roof shape and attic design on your exhaust ventilation system. 

Roof ventilation is no small detail to ignore. The wrong setup can trap moisture in the attic, creating conditions that may lead to condensation, rot, mold and premature roof failure. So, how do you pick the right set up? The team at RoofSmart replaces hundreds of roofs each year and has some tips on how to choose the right type of ventilation system based on the roof type and attic design.  

The three most common types of exhaust ventilation used on residential roofs are ridge vents, static vents and power vents:  

• Ridge vents are installed along the roof ridge and covered with ridge caps so they blend into the roofline. They are often the right fit for roofs with long, continuous ridgelines and strong intake ventilation. However, they may fail to perform properly when soffit intake is blocked or insufficient. 
• Static vents are installed near the top of the roof and come in different shapes and sizes. They can be a good option for roofs with multiple ridges, complex gables or limited ridge length, as long as there is enough intake ventilation and the vents are placed and spaced correctly. 
• Power vents use electricity or solar power to move air mechanically. They are often used when a roof has plenty of intake ventilation but very little space for exhaust, such as a very short ridge or a large attic with limited exhaust options. Proper balance is still critical because too much exhaust without enough intake can create ventilation problems. 

In addition to paying attention to the roof and attic, it is important to consider your area. For example, in Seattle (where RoofSmart operates) there are standard building codes outlining the amount of ventilation needed per attic space.  

Learn more about choosing the right roof ventilation system for your home.