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Weyerhaeuser’s 1-inch-thick, bullnose SturdiStep OSB stair treads are manufactured flat, straight, and knot-free, with a low moisture content. The material is field-trimmable and comes in 12- and 16-foot lengths and 11 1/2- or 10 1/4-inch widths. Prices range from $1.80 to $2.20 per linear foot. Weyerhaeuser, 888.453.8358,