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Thus if your attic is 450 square feet you need roof vents equaling 3 square feet.

Roof venting by roof sq footage. Ventsure 4 foot strip heat moisture ridge vent. What are the building code requirements for ventilating a roof. 27 lineal feet required. Which roof vents are best based on roof type climate and budget for example.

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. For example a 6 by 12 inch soffit vent has 72 square inches which when divided by 144 results in a 0 5 square foot opening. 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. 6 measure the radius of round vents or take half the diameter of the.

We know we need 5 square feet total of ventilation area. 1 500 square feet 300 5 square feet. Soffit vents are one of the most popular intake vent styles. 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.

Roofing manufacturers warranties require a minimum of one square foot of ventilation for every 150sf of attic space for traditional systems but only one square foot of ventilation for every 300sf when the ridge vent system is used. 1 square foot of ventilation for every 300 square feet of space for pitched roofs with vapor barriers. There are also gable and roof fans which actively pull the hot air out of the attic. Based upon just about everyone s recommendations 60 percent or 3 square feet of this should be in the soffit area and the remaining 40 percent 2 square feet should be located at the ridge of the roof.

Choose one of the following products to meet the recommended exhaust nfva of 528 square inches. This shortcut conveniently calculates the 2015 international residential building code minimum irc section r806 roof ventilation 1 which states in part 1 square foot of net free area for every 150 square feet of attic floor space with the attic defined as length x width floor of the attic. As a general rule your roof needs 1 square foot of vent area for every 150 square feet of attic space. They are easy to install under the roof s overhang which is known as the soffit are generally hidden from sight and provide excellent protection from weather outdoor debris and pests while still allowing air to flow into the attic.

See how simple that was. Calculate or enter the square footage of the attic or area to be vented. Continuous or individual soffits.

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