Antique Heart Pine Solid Wood Flooring, Cottage Grade This grade displays all the variations and natural character marks found in historic flooring, with rich colors that vary from light to dark. Heartwood content is 25% or more, a mixture of both plain and vertical grains. Knots are permissible and not limited by size or frequency, and some nail holes and characteristic grain clefts may be present. The area shown is about 16 square feet. Nominal Widths: 3"  4"  5"  6"  8"  10" Lengths: Nested Pack to 12', Average 6'-8' Solid 3/4" wood, site finished, tongue-and-groove, stress-relieved back, endmatched.