In order to install solid wood flooring over concrete subfloors, in the past, you either had to install plywood over the concrete and then install the wood on top or you had to install a prefinished engineered floor.
Today, with the new advanced adhesives, you can install 3/4″ Solid Wood floors directly over concrete. The new stronger adhesives also have sound abatement and moisture barrier built in. For the first time, you can have the beauty of a 3/4″ Solid wood floor without the build up or expense of laying down plywood over the subfloor. Great for hi-rise buildings!