Can I terminate my sewer vent pipe in the attic?

Question

Can a vent pipe stop in an attic crawl space as long as there is adequate ventilation in the attic?

Answer 1

Can it?

Sure! (But it probably won't meet code.)

Should it?

Only if you like the smell of sewer gas in your house. The vent is not trapped, so there's no slug of water preventing whatever gasses and smells happen to be wandering around the sewer system from making their way up and into your attic.

You may think your attic is properly vented. This will tell you for sure.