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Provide flashing and sealing integrated with the air and water control layers for vents and other roof penetrations
Right – In wildfire prone areas, using a flat soffit with venting on the fascia instead of an angled soffit with down-facing venting reduces the risk of catching rising embers.
The polyethylene ceiling vapor barrier is sealed to form an air barrier around the exhaust fan in this very cold climate location (≥ CZ 6).
Wrong - An open eave with no soffit covering can trap rising hot air and embers from a wildfire.
Wrong - If the soffit is applied directly to the rafter eave, it forms a sloping soffit, which creates a pocket that can trap hot air and embers from a wildfire.
Wrong – The open overhang with exposed timbers and unscreened vent holes make this roof more susceptible to ignition.