Roof Venting By Roof Sq Footage

We know we need 5 square feet total of ventilation area.

Roof venting by roof sq footage.

Which roof vents are best based on roof type climate and budget for example. 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. 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. That is a good indication of the difference in efficiency. 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. Choose one of the following products to meet the recommended exhaust nfva of 528 square inches.

There are also gable and roof fans which actively pull the hot air out of the attic. As a general rule your roof needs 1 square foot of vent area for every 150 square feet of attic space. 6 measure the radius of round vents or take half the diameter of the. Ventsure 4 foot strip heat moisture ridge vent.

We want to share those questions and answers with you. Calculate or enter the square footage of the attic or area to be vented. What are the building code requirements for ventilating a roof. See how simple that was.

1 square foot of ventilation for every 300 square feet of space for pitched roofs with vapor barriers. 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. Soffit vents are one of the most popular intake vent styles. 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.

1 500 square feet 300 5 square feet. 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. 27 lineal feet required.