A piece of solid wood flooring is very strong but not dimensionally stable, so the planks must be fixed into position during installation.
This can be done by secret nailing, secret screwing or gluing down using flexible flooring adhesive. [
It cannot be loose laid over an underlay, used with underfloor heating or installed in rooms where temperatures and humidity fluctuate (e.g. conservatories, kitchens, etc.). This is because the solid wood will negatively react to the changes in heat and moisture and move around causing gaps, warping and distortion, potentially causing irreversible damage.
