Foot of ventilation for every 150 sq.
Estimating ventilation requirements for attic.
Code requirements the international building code.
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.
Intake vents located at the lowest part of the roof under the eaves allow cool.
Divide the square footage item 1 by 300.
In of vent opening per 150 sq.
If not measure the size yourself.
Feet of attic space divided 50 50.
A ridge vent is a ventilation strip that is placed along the ridgeline of the home.
It is important that air movement occurs and is not impeded by any framing members of the.
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.
Ridge vents are one of the easiest ways to meet roof venting requirements.
Then aim for about 1 sq.
The roofing industry also has practical guide lines for attic ventilation.
Enter square footage calculate or enter the square footage of the attic or area to be vented.
The building code lets you reduce that by half under some conditions but more roof ventilation is usually better.
The two square feet is divided equally between the intake and the exhaust one square foot for each.
Attic ventilation works on the principle that heated air naturally rises primarily utilizing two types of vents.
Result of item 1 300.
Other options to meet your attic ventilation needs are.
Proper attic ventilation can be an impor tant performance consideration when design ing and installing steep slope roof systems.
Typically building codes include minimum requirements applicable to attic ventilation.
The ridge vent is installed on the peak with nails and shingled over for aesthetic purposes.
Generally as the roof pitch increases the volume inside the attic also increases along with the amount of needed.
Calculate the square footage of the attic space.
Calculating attic ventilation requirements.
Hence you would need two square feet 600 300 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.
The open area of a vent is sometimes listed on the roof air vent as nfva net free vent area.
Standard attic vents like af 50 s ventilation fans or solar powered attic fans.
