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Boral’s Tru Exterior Trim is made from PolyAsh, a blend of 70% fly ash and proprietary polymers. Its expansion rate is one-third that of PVC, says the maker. Screw heads can be driven cleanly flush to the surface without mushrooming (at least that’s what we found on the samples we received). The material is approved for ground contact and is compatible with silicone and acrylic caulking. It can be painted with any acrylic latex. The company just introduced a 5/8-inch by 6-inch beadboard that sells for $1.60 to $1.70 per linear foot.

Boral Composites, 800/926-7259, boraltruexterior.com.