You are lucky that they even were able to get the vent through the hole! I can’t tell you how many times I’ve inspected new roofs and found out that they went right over the hole for the vent line. Including my own roof!
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It’s not on a new build; it’s on a new roof. The roofer removes the old roof vent that has the pipe and replaces it with one that does not. Architectural shingles get replaced every 13-15 years here. Insurance companies flat out won’t insure you or will raise your rates so high that it’s more cost-effective to replace the roof. But you saying that makes me think that there is a misunderstanding by the roofer of how the vent should be connected if HVAC guys usually do the dryer vent 
Yep. I think they should eliminate it, especially on a2 story roof. I find screens on them all the time, and what homeowner is going to get a 24’ ladder to clean the dryer vent… Heck, I don’t even clean mine out! Haha
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I also see them leave the screens in all the time on brand new roofs 
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I would have to agree 100%. Especially when the laundry is on the main level of a two-story house, making the dryer push that air vertically for 20+ feet. I see so many like that. Makes no sense whatsoever when they can easily go out the side wall of the house.
At least the disconnected one you found was insulated. Most that I see in attics aren’t.
Same for bathroom vents that go out the roof… Just leaves me shaking my head… I can’t even tell you how many 11th month inspections I have done where the home owner asks me to figure out why water drips out the fan in the bathroom… Anymore, depending on the builder, I can tell them why before going into the attic…
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11th month warranty inspection
Dryer vent clogged on 7/12 slope two-story roof. There it’s no way to expect home owners to do maintenance like this.
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I see problems all the time as well with dryer vents that are terminated on the roof.
This note is in the laudry section of every home inspection I do.
FIRE HAZARD NOTE: According to the U.S. Consumer Product Safety Commission (USCPC) 15,000 fires occur each year as a result of improperly installed or improperly maintained dryer vents. It is recommended to inspect &
clean the dryer vent every 6 to 12 months, depending on use, to ensure safe & efficient operation of the dryer.
Whenever I inspect a condo I add this to my reports.
It is recommended to make inquiry with the current owner and
condo association to verify that there is a dryer vent duct cleaning
service contract in place, or if that is the condo owner’s responsibility.
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Do you guys think this roof vent might be an issue?
Looks like a case of the norovirus for the dryer vent 
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Just a self cleaning unit, Adam.
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Had to post here again. DEC 2024 roof I inspected today. Pictured is a disconnected dryer vent and microwave vent. I’m hoping this picture gives more context of what I mean by the roofing company installing an improper roof dryer vent. There is no pipe from the vent for the dryer vent to connect to in the attic.
These are great catches. Ventilation is often overlooked, especially if it is missing. I do not think the roofers should be making this connection. Cross trade errors are very common such as HVAC contractors doing their own electrical work. This is acceptable but they screw it up more often than not.
For me, this is a simple write up in my report and then move along. Most of us have stopped being surprised, lol.
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this was a brand new house on Friday, scheduled to close in a few days.
(not a dryer vent, but missed none the less)
and shingles still missing from the hurricane in October.
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And the builders don’t want us on the roof , as per their “guidelines”…
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