How Many Attic Turbines Do I Need

Let owens corning roofing help you calculate exactly how much ventilation you will need for a healthy and balanced attic with our 4 step ventilation calculator.

How many attic turbines do i need.

Good attic ventilation is important for preventing ice dams in the winter. Proper attic ventilation consists of a balance between air intake at your eaves soffits or fascias and air exhaust at or near your roof ridge. These can be ridge vents wind turbines or the flat vents your roofer wants to install. Attic must have 5 sq.

Since you want a balanced system you divide by 2 so that half of the ventilation is intake and half is exhaust. Having the correct number of turbine vents will provide an effective and balanced system. One static vent style is the turbine vent which uses wind to power its enclosed fan all it takes is a light breeze to rotate the blades and suck heat out of the attic view example on the home. Passive vents work for free and in almost all instances are silent.

Ft of vent space half dedicated for air intake in the soffits and the other half for exhaust on the roof. A turbine has a series of vanes that spin as wind passes through them. Thus if your attic is 450 square feet you need roof vents equaling 3 square feet. Take this number and divide it by three hundred.

In contrast an active ventilation device might be an electric powered whole house fan or a powered roof ventilator. A ridge vent runs across the top of the roof s peak. Thus 6 66 divided by 2 3 33 square feet of attic ventilation for intake and 3 33 square feet of attic ventilation for exhaust. The quotient is the amount of ventilation you will need for your attic.

As a general rule your roof needs 1 square foot of vent area for every 150 square feet of attic space. A turbine is installed directly on the top of a roof and uses wind power to suck hot and humid air out of the attic. You need 6 66 square feet of attic ventilation. I d put three or four on a roof to really have a good chance at cooling an attic on a hot summer day.

Federal housing authority recommends a minimum of at least 1 square foot of attic ventilation evenly split between intake and exhaust for every 300 square feet of attic floor space. Unlike turbines this venting style does not have any moving parts. Calculate or enter the square footage of the attic or area to be vented.