The ravc recommends never mixing two types of exhaust vents on the same roof above a common attic because it could short circuit the attic ventilation system.
Upper vent roof.
Ensure there is proper continuous intake ventilation below proposed roof to wall ventilation.
They can be located at the gable peak or somewhere in the field of the gable wall figure 8.
Shed roof ventilation instructions.
It s a roof top installed shingle over intake vent designed based on roofing contractor feedback from our ask the expert seminars.
Intake vents located at the lowest part of the roof under the eaves allow cool.
One often sees gable vents that are small in size and clearly won t provide adequate nfva.
Attic ventilation works on the principle that heated air naturally rises primarily utilizing two types of vents.
Step 2 measure 3 out from the wall where the smartvent will bend up on the wall.
The most effective vents have four open sides and rise above the roof which allows them to capture the wind from all directions to produce a suction effect.
Choose one of the following products to meet the recommended exhaust nfva of 528 square inches.
When used in conjunction with soffit vents they serve as exhaust vents.
Shingle up to the area that requires the smartvent roof to wall vent application.
It can be used to supplement existing soffit or undereave vents as well.
On lower single plane shed roofs that abut an upper story building wall venting can be provided by installing a half ridge at the upper roof slope.
To install the vent the roofer slips the flange the metal lip of the vent under shingles at the upper part of the hole and rests the flange on top of the shingles at the down slope part of the hole.
When installed as part of a properly balanced when installed as part of a properly balanced attic ventilation system gaf cobra exhaust vent is a shingle over exhaust vent installed at the roof ridge that helps exhaust excess heat and moisture from your attic.
Spot vents and gable end vents are a distant second choice for these designs for the reasons i outlined above.
Ventsure 4 foot strip heat moisture ridge vent.
27 lineal feet required.
To achieve full ventilation of the attic there must be an air inlet at the base of the roof through perforations in the eaves soffit.
In general there are five types or categories of exhaust vents.
Ventsure 4 foot strip heat moisture ridge vent with weather protector moisture barrier.
Gable vents are installed in the vertical walls at the gables ends.
