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Comparing Flat Roof Vents and Turbine Vents

Although more vent is generally better, replacing a turbine vent with a standard flat vent is acceptable, as long the vent is big enough for the square footage of the attic space.

By the DIY experts of The Family Handyman Magazine

Comparing Flat Roof Vents and Turbine Vents

Although more vent is generally better, replacing a turbine vent with a standard flat vent is acceptable, as long the vent is big enough for the square footage of the attic space.

How vents work

All things being equal, wind-driven turbine vents do move more air than flat vents (but only when the wind blows). The question: How much air must be moved? A largely arbitrary rule of thumb that's been adopted into most building codes calls for 1 sq. ft. of vented area for every 300 sq. ft. of attic space. So a 1,500-sq.-ft. attic must have 5 sq. ft.of vent pace&emdash;half dedicated for air intake in the soffits and the other half for exhaust on the roof. (These can be ridge vents, wind turbines or the flat vents your roofer wants to install.

Good attic ventilation is important for preventing ice dams in the winter. It also keeps your home cooler in the summer, vent moisture that finds its way from the living spaces of your home into the attic and helps shingles last longer. The fact is, it's hard to overventilate an attic—generally, more is better.

If you don't like the looks of wind turbines, don't be afraid to use the flat vents; just be sure to follow the 300-sq.-ft. rule. But if you want to use wind turbines, buy high-quality ones that have permanently lubricated ball bearings or plastic bushings in the spinning mechanisms. Usually, it's the cheaper units with metal bushings that will squeak and eventually drive you (and your neighbors) out of your mind on windy nights.

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Required Materials for this Project

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    • Roof vent

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July 20, 9:57 PM [GMT -5]

I have a ridge vent running from one gable end to the other and am thinking of adding two wind turbines to assist the ridge vents. A relative, however, recently had a new insulation technique done in his attic in which the soffets, gable and ridge vents were completly sealed. No air in or out. The insulation company said the attic would always be cool. So far the attic has been cool in the hot Georgia sun. Has anyone had this done and are they satisfied with the new insulation technique?

July 05, 4:54 PM [GMT -5]

I have a metal roof, uninsulated metal. No top vents at all and I am afraid to put in roof vents because the metal expands / shrinks too much to keep a good seal in a rainy climate.
My thought is to use thermostat / humidistat fans on one or both ends and let the soffit vents supply the incoming air.
The house is a 1933 built with many additions done by the owners in the past 25 years.
Has anyone ever had any luck keeping a metal roof vents sealed from heavy rains without having to use large amounts of roofing tar or mastic every few summers? The roof is white so black goo would look like heck.

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Comparing Flat Roof Vents and Turbine Vents

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