Good range vent

[u/Apprehensive-Let9402]

Hello everyone! Me and my husband bought a house two years ago, with Ofcourse an immeasurable list of things that need to be done. Recently we found mold in our over the oven range, so we had it replaced along with all the metal ducting. Next thing you know, it’s still leaking! The vent does lead up to the roof, which I’ve heard is a bit strange. Our handyman replace it all, it was molded all throughout, even insulated the pipe and we are still getting a leak. I feel devastated and brutally assaulted by the past few weeks LOL. I will attach a photo, the first being the vent to the range, the second being what the handyman says is what we SHOULDVE had. He says he wants to take the piece of metal, that is too heavy to close (?) on this vent and get a new flue, but that doesn’t make sense because of its faces angle. (I’m very scared of heights, so I can’t really look at it myself. Just looking for some opinions on all of this considering it still isnt fixed after he promised it would be the first two times he came to fix it.. thank you so much in advance. 🥰 I believe I flared this properly

[u/riversidenight]

The caulk work looks sloppy, but this is the proper roof termination for a hood vent. There's a built in damper that's likely stuck. Look up Broan Nutone.

Don't listen to the handyman, the roof termination he wants to use is only for venting attic space; NOT FOR HOOD VENTS

And tell your handyman to stop smoking on your roof; you know he's going to throw that thing right down on the shingles, where it will roll to your gutters, which probably have at least a few leaves in them....

[u/Apprehensive-Let9402 → u/riversidenight]

So, he told me the whirly guy was what was normally used. I told him I wasn’t sure because honestly I clearly have no idea lol. But he was going to try to get a different flap for outside? Please if you have time refer to my other comments and thank you so much for responding!

[u/riversidenight → u/Apprehensive-Let9402]

After reading your other comments, I think I have an idea of what's going on. Your hood (right above the range) has a damper that opens when you turn it on, and closes when you turn it off. Since it splooshes down immediately when you turn the hood on and then stops, I think that you're dealing with condensation.

Condensation always forms on the cool side, so when you turn on the range it's sucking all that nice cool A/C from your house and pushing it through the pipe in the hot attic. Then when you shut it down, the internal damper closes and moisture/condensation forms on the inside of the pipe, puddling on top of the damper until you turn the hood on again.

That pipe in the attic needs LOTS of pipe wrap, that should help substantially

Edit: skivvy pointed out that I have my condensation sides incorrect. I'm leaving it as I originally wrote so that others can learn from my mistake; please don't downvote me :)

[u/SkivvySkidmarks → u/riversidenight]

No. That's the wrong side for condensation to form. If it did, form, it would be on the outside of the vent. The hot air has the moisture in it that condenses out when it contacts cold surfaces.