How Much To Add Attic Ventilation

Attic ventilation works on the principle that heated air naturally rises primarily utilizing two types of vents.

How much to add attic ventilation.

Hvi recommends a ratio of 60 to 40 for soffit ventilation to gable or ridge ventilation. Adding a vent to existing ductwork is a diy job. Without exception you should talk to a professional to determine what your home requires. The realtor said that they do not count a room as a bedroom unless there is a suitable heat source.

Attic ventilation keeps the air moving and stops mold from growing but too much ventilation can be just as bad as having none. Ventilation of attic spaces is required by most building codes as well as by roofing material manufacturers and the national roofing contractors association nrca. 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. Generally speaking you need a ratio of 1 300 where for every 300 square feet of ceiling space you need 1 square foot of attic ventilation.

One reason for the lack of agreement over attic ventilation is the tremendous variation in climate across north america. Watch to find out how much ventilation your roof needs to keep air flowing and stop mold before it starts. They would not count the electric heat installed in the room. Intake vents located at the lowest part of the roof under the eaves allow cool.

Before we explore how to ventilate an attic space it is prudent to understand how much ventilation is needed. For instance attic ventilation is used widely in cold climates to evacuate the warm moist air that escapes from the living space below. We just ran ductwork to our upstairs and it is so wonderful. 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.

Enter square footage calculate or enter the square footage of the attic or area to be vented. Rarely will you find a building practice that works everywhere. Adding attic vents is a simple matter of cutting holes and installing vents. To keep air flowing your roof needs just the right amount of attic ventilation.

The downside of attic ventilation fans. So how much ventilation should you have. The reason we did it was because we wanted to sell our house. 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.

Photos 1 6 show how it s done.