Apex Ultrex pultruded fiberglass siding comes in 10 colors, 4- and 7-inch widths, and a smooth or wood grain finish. It’s available in 16-foot lengths and can be used in temperatures ranging from -30 degrees to 350 degrees, the company says. Factory-added clips let air circulate between the weather barrier, while the pultruded material resists warping, twisting, and sagging. 888.215.1092. www.apexsiding.com.