Flashing A Bath Vent On Metal Roof

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Old 11-07-2017, 10:50 AM   #1
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Flashing A Bath Vent On Metal Roof

Would like some advice on a good way to flash a plumbing and dryer vent on a Menards ProSnap (midwest manufacturing) metal roof. For plumbing vents these flexible boots are offered (pic attached) and would be a good fit for a round pipe like a plumbing vent. But what about the bath vent caps? They are typically square and wouldn't really work with these boots.

The penetrations are not in the roof yet, so they will be placed between the ribs. I'm thinking I should place the bath vent about 18" below the ridge over the finished roof, then cut the ribs off another panel and shingle it over the top of the square vent cap, much like you would with an asphalt shingle. The ridge vent, would then cover the top edge of the shingled roofing piece.

Is there a better way or better product for bath vents?
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Flashing a bath vent on metal roof-boot.jpg   Flashing a bath vent on metal roof-vent.jpg  
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