Rule Roof Ventilation

Of attic floor space.

Rule roof ventilation.

Too many people believe the importance of roof ventilation is to increase energy efficiency during the summer. Enter the length and width of the attic floor or the total square footage of the attic floor. A ridge vent is a ventilation strip that is placed along the ridgeline of the home. This means for every 150 square feet of attic floor space there should be 1 square foot of net free area.

By gaf roof views. Intake vents located at the lowest part of the roof under the eaves allow cool air to enter the attic. Good roof ventilation can do this but shingle color sun exposure and insulation are exponentially more important to overall energy efficiency than ventilation. Wash the underside of the roof deck with air.

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. The first step is to check out this 60 second video and learn about the 300 1 rule the difference between intake and exhaust ventilation and why proper ventilation is so important to get right to help calculate your attic ventilation needs visit gaf ventilation calculator. Regarding attic ventilation nrca recommends designers provide at least 1 square foot of nfva for every 150 square feet of attic space 1 150 ventilation ratio measured at the attic floor level ceiling. If you re actually going to vent the roof let s be serious about venting the roof.

That means the entire perimeter of the roof needs to have air inlets meaning continuous soffit ventilation. See quantities below for each gaf ventilation product typically rounded up. Prior to installing the ridge vent a 1 inch wide strip of roof decking is cut out along both sides of the ridgeline to allow for air movement through the vent. Hot air exhaust vents located at the peak of the roof allow hot air to escape.

Hit the calculate button for the recommended amount of exhaust and intake ventilation.