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 venting requirements bc.
The roofing industry also has practical guide lines for attic ventilation.
Vent requirements 1 except as provided in sentence 2 the unobstructed vent area shall be not less than 1 300 of the insulated ceiling area.
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 can be an impor tant performance consideration when design ing and installing steep slope roof systems.
Enter square footage calculate or enter the square footage of the attic or area to be vented.
They are easy to install under the roof s overhang which is known as the soffit are generally hidden from sight and provide excellent protection from weather outdoor debris and pests while still allowing air to flow into the attic.
It is important that air movement occurs and is not impeded by any framing members of the.
Effective attic ventilation systems reduce damaging heat and moisture in your attic promote energy efficiency by helping to reduce the load on your air conditioner in the summer and also reduce the risk of ice dam formation on your roof.
If that language gets adopted and resnet passes its amendment the eri will be based on the new irc ventilation rate.
A ridge vent is a ventilation strip that is placed along the ridgeline of the home.
Code requirements the international building code.
The eri reference design ventilation rate shall be as specified by equation 15 1 of section m1507 3 3 of the international residential code.
Typically building codes include minimum requirements applicable to attic ventilation.
The reader is urged to consult all relevant codes governing construction design and practices in any given jurisdiction.
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.
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.
Soffit vents are one of the most popular intake vent styles.
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.
If the code amendment passes but resnet s doesn t resnet will have to make changes to.
2 where the roof slope is less than 1 in 6 or in roofs that are constructed wi th roof joists the unobstructed vent area shall be not less than 1 150 of the insulated ceiling area.
