Figuring Attic Ventilation

Ft divided by 150 equals 10 sq.

Figuring attic ventilation.

Length x width of attic in feet 150 total sq. The formula for figuring out the cubic footage of a rectangular solid like the interior of a room is length times width times height. 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. 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.

Here are the answers to the five most frequent questions pertaining to calculating attic ventilation. If you want to heat or cool your attic space calculating its cubic footage is necessary to determine adequate ventilation. Calculate or enter the square footage of the attic or area to be vented. Calculation q a.

Intake vents located at the lowest part of the roof under the eaves allow cool. Standard attic vents like af 50 s ventilation fans or solar powered attic fans. 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. Of total vent space needed.

Calculate the total vent area needed. 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. But the shortcut is just as good and faster. Attic ventilation works on the principle that heated air naturally rises primarily utilizing two types of vents.

Divide the attic s square footage by 150. Most attic ventilation manufacturers list the longer formula on their websites and inside key product brochures. The federal housing administration recommends 1 square foot of attic ventilation for every 150 square feet of attic space. Why is it important that the amount of intake ventilation.

A 50 x 30 attic would have a total area of 1 500 sq. Let s use the following simple ranch house for an example. Other options to meet your attic ventilation needs are. 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. A correct attic ventilation system provides for a steady flow of outside air from the lowest part of the attic through the attic to the upper most part of the attic as shown in figure 1. However an attic usually doesn t have straight walls.