I can’t remember seeing this before, but is there a minimum space required for this before the roof? This looks wrong to me for some reason. To the left is the vent for laundry drain, to the right is the bath sink…
I can’t imagine there would be any official requirement for the distance from the T to the roof sheathing (assuming that is what you are asking about). Would maybe be nice if it was lower in case it ever needs to be worked, but even that is not really anything to worry about as a plumber will likely just cut it off lower and replace everything going up if there is a problem someday (unlikely).
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All a plumbing vent does is provide makeup airflow to the drainage system so that wastewater flows freely and bio-contaminated unhealthy air is vented far away from occupants. Exceedingly simple from a fluid-dynamics perspective (it is low-speed low-volume air flow), so not understanding why the fuss here. Any configuration of vent pipes are fine in my book as long as rainwater and condensation cannot accumulate inside the piping. As such, I would be more concerned with the flat section at the bottom of the left vent, does it have an adequate slope?
Noted exception: If many vent pipes are combined (e.g. more than four), it would be advisable to combine them to a larger diameter pipe at the top of the stack to ensure adequate airflow.
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It’s fine, move on.
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what Martin said…
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What James said…
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What Richard said…
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What Brian Said
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What Bert said.
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What Kevin said.
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What JR said….wait a minute 
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Yep!
That wouldn’t get in my report.
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That would FAIL…
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…to get in my report.
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What Larry said!
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What Neil said.
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Its a branch vent, not a main soil stack vent.
Note though, there is an elbow at the bottom of the vertical DWV and different DWV plastic and the cement looks butchered.
A branch vent can’t go through a roof.
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Maybe in Florida, but this wouldn’t fly in the northern states where it freezes.
Why is that, Josh? 
I’m not following you.
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