How To Figure Ventilation For Attic

His home is 48 feet long and has a ridge vent that measures 46 feet.

How to figure ventilation for attic.

Enter square footage calculate or enter the square footage of the attic or area to be vented. Other options to meet your attic ventilation needs are. 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. The ridge vent is cut back 1 inch on either side of the ridgeline which yields a total area of 7 67 square feet of ventilation.

Multiple these two measurements to arrive at a square footage number. 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. 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. Length x width of attic in feet 150 total sq.

Ft divided by 150 equals 10 sq. Calculate the total vent area needed. The house measures 30 feet by 50 feet. Calculate the square footage of your attic.

Of total vent space needed. A 50 x 30 attic would have a total area of 1 500 sq. It s the recommendation of the roof assembly ventilation coalition ravc that all roofing professionals have a basic understanding of the attic ventilation calculations necessary to help the system. Measure the length and width of the attic space using a tape measure.

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. Calculating ventilation area of attic kitchen ventilation text. 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. 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.

His next step is to calculate the total amount of ventilation that he has in his attic. Let s use the following simple ranch house for an example. 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. This allows the attic insulation to perform at peak efficiency helping to maintain constant temperatures in your home.

Imperative to understand how to calculate if there is enough attic ventilation if you want that system to perform optimally. 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.