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Eve Line Venting and Lower Air Intake Phoenix Arizona | Attic Ventilation by Barrier Insulation, Inc. AZ
An eve air vent includes upper and lower panels joined at their upper edges, and spaced apart at their lower edges to form a wedge shape. Longitudinal ribs are sandwiched between the upper and lower panels to form inlets at the lower edge, and air passages between the panels. Large outlet holes are provided on the lower panel. The vent is installed between the shingles and plywood sheathing of a roof, with its lower edge flush with the eve. A strip of plywood sheathing is removed, or left out during roof construction, to create a hole aligned with the outlets on the bottom of the vent. Air is thus able to enter from the outside environment through the inlets at the lower edge of the vent, and pass through the holes in the plywood sheathing into the attic. The vent is installed without modification to the eve, and it does not protrude beyond the eve, so that it does not mar the appearance of the eve.
Building codes require that a roof for a house must be built to breath, i.e., air must be allowed to pass between the attic and the outside environment. A wood shingled roof normally allows breathing between the shingles. During reroofing, when the shingles are typically replaced with asphalt, plywood sheathing must be installed as a substrate. The plywood sheathing is a solid barrier, so that vents must be installed to provide ventilation. |
