Can I Add a Sink Drain Into Attic Plumbing Vent?

You’re renovating your attic and want to add a sink—but there’s no nearby drain. Then you spot it: the attic plumbing vent pipe. “Can I add a sink drain into attic plumbing vent?” It sounds like a convenient shortcut. But before you grab your wrench, understand this: it’s almost always a bad idea—and often illegal.…