If your attic is sweltering or your roof shingles are starting to crack or blister there s a good chance you could benefit from additional ventilation in your roof.
Cool attic static vents.
Attic ventilation works on the principle that heated air naturally rises primarily utilizing two types of vents.
Cool air enters the attic through soffit vents in the eaves.
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Most effective ventilation uses a ridge and soffit continuous ventilation system but even these designs can vary from roof to roof.
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This attic vent can quickly remove a larger volume of hot and or humid air from your attic when compared to static ventilation.
Most homes already have some passive attic venting built in.
List of the cons of roof ridge vents.
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Static roof line vents are effective for ventilation but generally aren t recommended due to issues with leaks.
Intake vents located at the lowest part of the roof under the eaves allow cool.
This allows the incoming cooler drier air to enter the attic at the lowest possible location flush out any built up heat and moisture from inside the attic all along the entire underside of the roof deck and push it out through the exhaust vents high on the roof.
For pricing and availability.
Once inside the air heats up and rises higher ultimately exiting through venting at the roof s gables through ridge vents cut into the roof s apex or other vent holes in the roof.
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Soffit vents may leave air trapped at the top of your attic.
This method achieves the goal of air movement through the attic underneath your roofline.
Ridge vents do not always provide the proper ventilation in some homes.
Powered attic ventilators are the worst way to try to keep your attic cool.
They ve been well discussed here and other places but briefly they re not cost effective don t deal with the problem where it starts are using convection to solve a radiant heat problem and can even be dangerous by backdrafting combustion appliances and putting carbon monoxide in the home.
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The effect of ridge vents for the roof depends upon the energy efficient nature of the structure.
The most common method of static ventilation is a combination of soffit vents and either box vents or continuous ridge vents.
Duct or up to 8 in.
