Flashing often gets too little attention in the design process, particularly in residential work. Blueprints end up vague on the flashing details, and contractors end up doing a make-shift job with roll stock and roofing cement. But that's asking for trouble. You can do beautiful work on the big expanses of siding or roofing, but water is going to get in where things intersect. And the designs we've been seeing lately aren't short on intersecting planes. The only way to make sure the structure is weathertight, and will remain that way, is to take the time to review tricky flashing situations on a job-by-job basis with your carpenters and roofers. Here are six tough areas we see