Range hood vent near roof valley

What do you think about the hood vent at this location? Is it code violation? Is it an absolute no? Northern California, no snow.

(Ignore the existing opening, will be fixed. Picture just show the location, vent is not installed yet)
Closed point of flashing is 3" from center of valley. Closed point of the actual opening is 14" away.

I know it’s not ideal but this world has all sorts of constraints.

I wouldn’t sweat it, it’s on the high side in a no load location.


Location of the range hood vent near the roof valley could have potential problems in terms of water penetration, but highly unlikely. Closed point of flashing being 3" away from the center of the valley typically would have the water directed towards the range hood vent, potentially causing leaks, but I agree with DarkThirty that it’s safer because it’s on the high side with no load.

The flashing around the vent may need to be modified to ensure that it provides full protection against water penetration.

What type of modification of the existing flashing would you recommend?

How can the shortcomings of the factory flashing be remedied in the field?


Thanks for the answers!

Some options could be:

Adding additional flashing: One option could be to add additional flashing material around the vent to extend its coverage and provide more protection against water penetration. This could involve adding a cricket or diverter to direct water away from the vent and towards the roof edges, where it can be safely drained.

Sealant application: Another option could be to apply a sealant or caulking material around the perimeter of the vent to help seal any gaps or openings in the flashing.

Vent replacement: Depending on the specific design of the range hood vent, it may be possible to replace the factory flashing with a custom-made flashing kit that is designed to better suit the specific roof configuration.

To remedy the shortcomings of the factory flashing in the field you could perform an inspection of the vent installation and the surrounding roof area. Examine the condition of the existing flashing, as well as the potential for water penetration and damage to the roof system.

Damn, talk about an excessive approach. It’s a vent flashing and distance from the valley is adequate. Any roofer with a year or two experience could handle this.


Could be another bot trying to learn.


It does sound like other examples of AI chat bot writings

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Definitely NOT a roofer. Sounds like a 40 year old virgin engineer with a pocket protector that still lives in his mom’s basement and never got his hands dirty. Did I miss anything?


Thats an awesome description, I actually call them imagineers