HardiePanel siding is factory-primed fiber-cement vertical siding available in a variety of sizes and textures. Textures include smooth, stucco, Cedarmill and Sierra 8. HardiePanel vertical siding is 5/16" thick and is available in 4x8, 4x9 and 4x10 sizes. HardiePanel vertical siding is available as a prefinished James Hardie product with ColorPlus Technology. The ColorPlus coating is a factory applied, oven baked finish available on a variety of James Hardie siding and trim products.