crown molding made of plaster-covered wood
Photo: Don Penny/Time Inc. Digital Studio
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Crown Material: Plaster-Covered Foam

The 8-foot lengths of extruded polystyrene are topped with fiberglass and a thin coat of acrylic plaster. It's light and flexible as wood, as seamless as solid plaster, and DIY-friendly; joint compound holds it in place and fills seams. Like plaster, it has to be painted.

Stock profiles range from about $1.80 to $7.75 per linear foot.

Shown: 6-inch-high CTR-813, about $4.10 per linear foot; Canamould Extrusions (Go here to see how Canamould is installed)
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