JLC ??NOVEMBER 1991 THE DOWN & DIRTY ON DWV It usually begins something like this: You call a plumber in to look at a job; you just want to confirm the specs and discuss faucet styles and fixture colors…Then your plumber says, "Of course, this will need a vent running up through that wall to the roof." Your eyes go wide. You've already given a price to the customer and now you have to cover additional plumbing, carpentry, and finish work. At this point, you don't want to ask why; you don't especially want to hear the answer. The purpose of this article is to help you avoid such surprises. First I'll explain how
