Here's a situation that's fairly common for homes of a certain scale built in the teens and '20s: The home's detached garage, usually set against the rear property line, often had a flat roof with ...

Q: I enjoyed the article about puddling on flat roofs (Nov. 2, 2002). I have a slope problem on a 12-by-10-foot one-story addition attached at one edge to a higher wall of my split-level house.