Of total vent space needed.
Find attic area.
You want high quality insulation in your attic as it will ensure that the cool air from your air conditioner can t escape your home.
Step 4 measure the height of your attic in feet.
Calculate the total vent area needed.
Having insulation in your attic can help you save up to 20 in heating and cooling costs.
A 50 x 30 attic would have a total area of 1 500 sq.
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.
For example if your length is 40 feet and your width is 20 feet then 40 20 800 square feet.
Step 5 multiply step 3 by step 4 by 1 3.
Smaller spaces may be hard to access especially if you re carrying items to or from the attic.
Multiply step 1 and step 2 together to get the area of the attic floor.
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.
Attic ladder installation typically requires a space that is at least 25 inches by 55 inches.
Ft divided by 150 equals 10 sq.
For example if your attic height is 10 feet and your attic area is 800 then 10 800 1 3.
An attic sometimes referred to as a loft is a space found directly below the pitched roof of a house or other building.
And having insulation in your attic keeps the area at a consistent temperature.
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Length x width of attic in feet 150 total sq.
Let s use the following simple ranch house for an example.
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.
Determine the net free ventilating area the attic vents you plan to install.
Here are a few guidelines for choosing the right area and cutting an appropriate access hatch to your attic.
Square footage relates to the floor area only and does not factor in the height of the attic space.
This number is often included on the vent label but you can also calculate it.
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.
An attic may also be called a sky parlor or a garret because attics fill the space between the ceiling of the top floor of a building and the slanted roof they are known for being awkwardly shaped spaces with exposed rafters and difficult to reach corners.
The house measures 30 feet by 50 feet.
Whether you plan on improving the ventilation in your attic or adding energy saving insulation you will need to accurately determine its actual size.
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