How To Figure Ventilation For Attic

Let s use the following simple ranch house for an example.

How to figure ventilation for attic. 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. Calculate the total vent area needed. Length x width of attic in feet 150 total 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.

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. 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. Use this calculator to help determine the proper amount of attic ventilation based on u s. Other options to meet your attic ventilation needs are.

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. A 50 x 30 attic would have a total area of 1 500 sq. The house measures 30 feet by 50 feet. Imperative to understand how to calculate if there is enough attic ventilation if you want that system to perform optimally.

Calculate the square footage of your attic. 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. 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. This allows the attic insulation to perform at peak efficiency helping to maintain constant temperatures in your home.

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. Enter square footage calculate or enter the square footage of the attic or area to be vented. Measure the length and width of the attic space using a tape measure. His home is 48 feet long and has a ridge vent that measures 46 feet.

Standard attic vents like af 50 s ventilation fans or solar powered attic fans. 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. Ft divided by 150 equals 10 sq. Gaf attic ventilation calculator.

Calculating ventilation area of attic kitchen ventilation text. His next step is to calculate the total amount of ventilation that he has in his attic.