How Much To Add Attic Ventilation

So how much ventilation should you have.

How much to add attic ventilation.

Photos 1 6 show how it s done. 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. 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. Ventilation can be accomplished using various products and techniques.

Adding a vent to existing ductwork is a diy job. One reason for the lack of agreement over attic ventilation is the tremendous variation in climate across north america. Ventilation of attic spaces is required by most building codes as well as by roofing material manufacturers and the national roofing contractors association nrca. Add a dab of cement to secure the shingles to the attic vent cover base.

Attic ventilation works on the principle that heated air naturally rises primarily utilizing two types of vents. Without exception you should talk to a professional to determine what your home requires. Hvi recommends a ratio of 60 to 40 for soffit ventilation to gable or ridge ventilation. Attic ventilation keeps the air moving and stops mold from growing but too much ventilation can be just as bad as having none.

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. Adding attic vents is a simple matter of cutting holes and installing vents. Watch to find out how much ventilation your roof needs to keep air flowing and stop mold before it starts. The downside of attic ventilation fans.

Enter square footage calculate or enter the square footage of the attic or area to be vented. We just ran ductwork to our upstairs and it is so wonderful. They would not count the electric heat installed in the room. Before we explore how to ventilate an attic space it is prudent to understand how much ventilation is needed.

The reason we did it was because we wanted to sell our house. Rarely will you find a building practice that works everywhere. Intake vents located at the lowest part of the roof under the eaves allow cool. To keep air flowing your roof needs just the right amount of attic ventilation.

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.