Our garage tiles are very heavy weighing up to 4.5lbs each so when the whole floor is installed it's very heavy and will not move. They will however expand/contract with temperature changes like every material will. The majority of installations require no adhesive. The only times you need adhesives is if the tiles are going to be exposed to constant sunlight on a portion of the floor. If you leave your garage door or overhead door open all day and the sun is shinning on part of the floor that portion of the floor is going to get hotter than the rest of the floor. Therefore it will expand at a different rate and will often buckle at the line between sunlight and shade. If you leave your door open for short periods of time there's no need to glue the tiles down. The other application where you need adhesive is in commercial applications that have drive through situation. So if the tiles are open ended on both ends you need to glue them down.