Although roll up garage door models tend to cost more than their tilt-up counterparts, they are generally preferred because of their easy operation, ability to open even with a car parked right in front of them, and the fact that they allow more head room. A roll up garage door is made of four or more horizontal sections, hinged together and mounted with rollers on tracks on each side that enable it to roll straight up and back. A roll up garage door tends to be more secure and weather tight than tilt-up models because they fit behind rather than within the opening. Start with Garage Door Central for a great price on a roll up garage door.