Do the rolls curl or buckle? Do you have to have adhesive? If so, what kind and how much?

Our 8mm Strong Rubber Rolls will not curl or buckle. As long as they are installed properly, you shouldn't have any issues. The only time we see any buckling would be from an improperly installed installation. Our rubber flooring will expand and contract, so we recommend placing an 8mm (5/16") expansion gap around the flooring to ensure proper expansion and contraction. For most residential applications, no glue or tape is needed to install our 8mm Strong Rubber Rolls. They are heavy enough on their own to stay in place. If a particular exercise move caused a roll to move for some reason, you could add some double-sided tape under the roll. For commercial applications, we do recommend using double-sided tape or polyurethane adhesive to keep the rolls in place. In this situation, you could get away without using either, but because there could be a number of exercises performed on the flooring, we recommend a little bit of hold, so you don't have to go back later to add it.