Yes, it is possible to install solid wood flooring directly on a concrete subfloor, but it requires specific preparation and installation techniques. When installing wood flooring on concrete, a moisture barrier or vapour retarder is typically recommended to prevent moisture from the concrete from affecting the wood. The concrete subfloor should be clean, dry, and level before installation. In some cases, it may be necessary to level the concrete or address any moisture issues present. Engineered wood flooring is often the preferred choice for installations over concrete, as it is more dimensionally stable and less prone to moisture-related issues compared to solid wood flooring. It's important to follow the manufacturer's guidelines and recommendations for the specific type of wood flooring being installed and to use adhesives and installation methods suitable for concrete subfloors.