How Many Square Feet Per Roof Turbine

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 many square feet per roof turbine.

The next step is to select a suitable exhaust vent and intake vent that fits the roof design for best performance and best aesthetics. 30 lineal feet required. A small 12 inch diameter turbine vent with a constant wind speed of 5 miles per hour mph can remove 347 cubic feet of air per minute cfm from the attic space. Say the contractor is standing in front of a house that has an attic with 2 200 square feet.

1 square foot of ventilation for every 300 square feet of space for pitched roofs with vapor barriers. 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. 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. Thus if your attic is 450 square feet you need roof vents equaling 3 square feet.

What are the building code requirements for ventilating a roof. First find out the square footage of your attic and sketch it onto the graph paper. For example a 6 by 12 inch soffit vent has 72 square inches which when divided by 144 results in a 0 5 square. This is accomplished by taking the square feet recommended and multiplying by 144.

Because vents are rated in square inches you need to convert the square feet required to square inches. 2 200 2 1 100 square inches of exhaust net free area needed. Build your roof empowers you to select each layer and component that goes into your total protection roofing system so that you get the roof you want to protect your home. There are also gable and roof fans which actively pull the hot air out of the attic.

Depending upon the diameter of the vents and the wind speed outdoors the turbines can expel vast quantities of humid air before it becomes a problem. 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. 1 100 square inches of intake net free area needed. This will give you square inches instead of square feet.

As a general rule your roof needs 1 square foot of vent area for every 150 square feet of attic space. Now take the square footage number and multiply it by 144. Which roof vents are best based on roof type climate and budget for example. We want to share those questions and answers with you.

Flat roof vents have no moving parts to break or squeak but don t vent as much air as wind driven vents. Take this number and divide it by three hundred.