Volatile market conditions create winners and losers, and Owens Corning's (OC 0.70%) latest move will put it in one of those two camps. Does it make sense to take on debt to buy a company in a declining market? That's the question facing Owens Corning investors as they digest the agreement to acquire residential door company Masonite International (DOOR -0.39%). I think the answer is "yes," and it's based on the company's history of cash generation.Introducing Owens CorningYou don't have to buy technology s ...