Figuring Attic Ventilation

According to the fha federal housing administration us for every 300 square feet of attic floor area you should have at minimum one square foot ventilation.

Figuring attic ventilation.

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. Always consult a design professional for cathedral ceilings insulated roof decks etc. Ft divided by 150 equals 10 sq. Ok to determine how much ventilation area you need for your house all you need to know is the square foot area of the attic to be ventilated.

Let s use the following simple ranch house for an example. Attic ventilation works on the principle that heated air naturally rises primarily utilizing two types of vents. Standard attic vents like af 50 s ventilation fans or solar powered attic fans. Enter the length and width of the attic floor or the total square footage of the attic floor.

Calculating ventilation area of attic kitchen ventilation text. Other options to meet your attic ventilation needs are. Length x width of attic in feet 150 total sq. If you are in the puget sound area of washington state and would like to have a free attic ventilation evaluation or roof estimate please contact us at 253 445 8950 or fill out our quick estimate form.

The house measures 30 feet by 50 feet. Skip to main content. Enter square footage calculate or enter the square footage of the attic or area to be vented. Multiply the length of the attic times the width in feet to find the attic area then divide by 150 to find the total square feet of vent space needed.

How do you pick the right attic vent. 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. Figure 1 soffit to ridge attic ventilation. Intake vents located at the lowest part of the roof under the eaves allow cool.

Calculate the total vent area needed. 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. As an example in an attic that is 30 feet by 20 feet you would have 600 square feet of floor area. We have calculators for intake and exhaust roof venting.

A 50 x 30 attic would have a total area of 1 500 sq. Roof attic ventilation calculator calculate how much ventilation you need for your roof.