Holes and cracks are unsightly, sure, but such outward imperfections aren't merely jeopardizing the appearance of your home. They are compromising its structural integrity. For one thing, gaps in exterior cladding admit moisture, the enemy of wood. Plus, wherever water gains entry to the home, so too can critters and insects. And while some pests are relatively benign, others are potentially devastating (for example, termites). As Eldredge of Sears Home Services reminds homeowners, "To maintain the integrity of your home, it's essential to replace damaged siding."