Options for venting a bathroom exhaust fan include best to worst.
Exhaust fan through gable vent.
Depending on how the attic ventilation is designed the hot moist air exhausted from the duct could be drawn back into the attic through the gable vent.
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However your roofer is correct that bathroom exhaust venting is desirable to avoid indoor moisture problems that can extend to the attic roof sheathing and can affect roof life.
When gable end vents are combined with soffit vents this can keep a continuous air flow through your roof or attic.
Whatever area you block with the exhaust duct is a reduction in the area of the gable vent.
Exhaust vents releasing all of the heat that rises and gets trapped in the attic can be achieved with one or a combination of the three following vent models in addition to the multipurpose gable.
This will help reduce the humidity in your roof reducing the risk of damaging your roof.
Through the roof or an exterior gable wall.
Air vent black gable power ventilation.
The resistance to the airflow in the long duct caused the air to back up in the nearest bathroom especially when more than one fan was on at the same time.
And of course a bathroom with a window doesn t require an exhaust vent.
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If you vent through a soffit where attic vents are often located the moisture will get sucked back up into the attic or roof venting.
If you vent through the roof condensation will drip back into the interior.
The best way to vent bathroom fans is with schedule 20 bell end drain pipe.
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These pipes come in 10 foot length and the bell end must face the fan.
I recommend that my clients vent their bath fans out a gable wall if at all possible when not using an hrv or erv that is.
An exhaust vent fan can exhaust out through a gable end side wall or out through a soffit overhang.
Crawling in the attic revealed the connection of four bath fans into one long duct going to a gable vent.
First off you ll be reducing the size of the gable vent.