Just like wood, cork floors are subject to expansion and contraction due to climate. During heating season, moisture is lost and the tiles may contract slightly showing small spaces between the planks. When moisture levels increase, the tiles will expand.
Cork as a rule is more stable than wood flooring for the fact that when wood expands, it does so only in the direction of the grain. With cork, the expansion or contraction process is dispersed in all directions. With proper acclimation, installation and maintenance, any expansion/contraction will not be noticeable.
Maintaining a stable environment with temperature and humidity control is optimal. During installation, the following precautions should be taken: If installing in the winter; once the planks have been acclimated, do not install the joins too tightly as the floor can go through an expansion period months later. In summer; again after the tile have been acclimated, it is necessary to butt the tiles together tightly since dry heat will cause them to contract in winter.