Figuring Attic Ventilation

Calculating ventilation area of attic kitchen ventilation text.

Figuring attic ventilation. 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. Intake vents located at the lowest part of the roof under the eaves allow cool. Of total vent space needed. 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.

Length x width of attic in feet 150 total sq. 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. Divide the attic s square footage by 150. Ft divided by 150 equals 10 sq.

If you want to heat or cool your attic space calculating its cubic footage is necessary to determine adequate ventilation. Calculation q a. The formula for figuring out the cubic footage of a rectangular solid like the interior of a room is length times width times height. 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.

Calculate or enter the square footage of the attic or area to be vented. But the shortcut is just as good and faster. Here are the answers to the five most frequent questions pertaining to calculating attic ventilation. This allows the attic insulation to perform at peak efficiency helping to maintain constant temperatures in your home.

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. Other options to meet your attic ventilation needs are. Let s use the following simple ranch house for an example. Why is it important that the amount of intake ventilation.

Standard attic vents like af 50 s ventilation fans or solar powered attic fans. However an attic usually doesn t have straight walls. 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. Most attic ventilation manufacturers list the longer formula on their websites and inside key product brochures.

A 50 x 30 attic would have a total area of 1 500 sq. Attic ventilation works on the principle that heated air naturally rises primarily utilizing two types of vents. 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.