Your garage door seal is the unsung hero of your garage, providing a soft cushion for your door when it closes while also sealing out moisture, rodents and cold air. In fact, when a garage door seal is working properly, it’s easy to forget all about it. But once the seal is damaged or starts to fail, you’ll probably notice pretty quickly. Without that proper seal, your door will be louder when it closes and the leading edge meets the concrete. A bad seal means that edge is exposed to damaging impacts that can interfere with the way the door works and even alter the structural integrity of the door.