James Hardie's Primed Fiber Cement Smooth Hardie Plank Lap Siding is the companys best-selling product. The siding features ASTM E136 noncombustible cladding wont attract pests or insects such as termites and woodpeckers. The HZ5 engineering means it is made to withstand temperature fluctuations, snow, ice, freezing temperatures, and hail.