I vividly remember the job where I learned that even properly installed siding isn't waterproof. It was a large, expensive gambrel on the peak of the highest hill in town. Start to finish, the job was a plum. The clients were overjoyed with my work and moved in ahead of schedule. But six months later, a wind-driven rain converted my plum into a prune. In a late-night phone call, the owner explained in detail how many drips-per-minute were falling from the head jamb of the east-facing double-mullion window. I "fixed" the leak the next day, but it reoccurred once a year for three consecutive years. Each time there was a
