HardiePlank® Fiber Cement Lap siding in Timberbark Select Cedarmill® finish for a natural cedar look with the soft texture of real wood. Traditional and timeless. Clean and robust. HardiePlank® lap siding is the most popular brand of siding in North America. Dimensions: 6.25 in x 12 ft Thickness: 5/16 in 30 year limited warranty