I'm a remodeler. A customer of mine (who I'm too busy to work for right now) drywalled his own living room. He ran the drywall horizontally on the walls, then asked me if he had done it right. I told him my 'preference' on the walls is to run it vertically (as long as the framing is accurate), and avoid the 'butt' seams. He's got a spackler coming in who told him anyone who runs it vertically is a 'hack', he says the joints will crack. Funny, I can take this guy to jobs I've done 15 years ago, and am willing to let him 'watch and wait' til it cracks. Am I missing something? P.S. I'm only talking about walls, not ceilings.