Hi. These are tiles. You can make a preparation or mixture of sand, lime and a little adhesive only for ceramics. The latter will be the one that will give hardness to the mixture. Lime gives plasticity. Pour the mixture on the floor making a small mountain in the center in the center, wet the tile and place it. This small mountain of mixing is so that when the seats are distributed sideways and glue on the largest possible surface. Then you must take the boards. For this use a little adhesive. Wait a couple of days before transit. regards