How To Figure Roof Ventilation

Roof ventilation calculator enter your attic area or length and width to determine your ventilation needs.

How to figure roof ventilation. How to calculate your roof venting requirements. 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. 11 12 roof pitch and higher increase the amount of ventilation by 30 percent. Select ventilation product flex roll ridge vent multi roll multi purpose vent rigid roll ridge.

Although there are many different types of roof vents to choose from ensuring you have the right number of both intake and exhaust vents is a central part of roof design. Width or area. Proper attic ventilation offers numerous advantages to the homeowner. Up to 6 12 roof pitch use the standard formula as explained in this article.

For projects involving vents with motors the calculation formula is different. 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. 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. Roof decks can reach over 170 degrees f 76 7 c.

Improperly vented roofs can cook roofing materials. Enter square footage calculate or enter the square footage of the attic or area to be vented. 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. 7 12 to 10 12 roof pitches increase the amount of ventilation by 20 percent.