Most engineered floors can be glued-down, stapled-down or floated over a variety of subfloors including wood, dry concrete slabs and some types of existing flooring. Engineered hardwood floors have cross-ply construction which reduces the expansion/contraction of planks caused by variations in humidity and allows these floors to be installed on any level in the home. Available in plank and longstrip format, Mohawk Engineered Hardwood Floors come in a wide variety of widths, thicknesses and colors in both North American and Exotic hardwoods.