Sistering: A Cure for Sloped Floors by Walter Jowers Some people say sloping floors are part of the charm of an old house. But as old houses become more fashionable and more expensive, old-house dwellers are less willing to put up with this kind of charm. Try to tell somebody who just paid a few hundred thousand dollars for a renovated colonial that he's just going to have to learn to live with water running out of one end of the Jacuzzi! Sloping floors are also a constant pain to the contractor working on a major renovation. Just about every new piece of material that goes into the house will have to be scribed, or shimmed, or otherwise