Over the years, the eyebrow dormer on my client's 1926 colonial had seen its share of bad Long Island weather. Though the trim was structurally sound, the paint finish was in sad shape. To protect the window from deterioration and minimize future maintenance, I suggested to the owner that we clad the weathered trim boards with 1/2-inch Kleer PVC trim (866/553-3770, www.kleerlumber.com). While PVC can be easily machined and sanded, just like wood, it's a lot more durable; best of all, I knew I could heat-bend it to fit the graceful curves of the dormer.

Initially, I thought I would be able to measure the dormer's radius and use math to lay out, cut, and shape the material on the ground. But after taking a few measurements from different areas of the eyebrow, I realized that the carpenter who had originally built the dormer had freehanded some of the trim; there was no way I could mathematically...

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