Exterior basement waterproofing involves applying waterproofing materials and techniques to the outside of a basement to prevent water from entering. This method typically includes excavating around the foundation, applying a waterproof membrane, and installing a drainage system. It's important because it addresses the root cause of water infiltration, protecting your basement from leaks, mold, and structural damage. Proper exterior waterproofing helps maintain the integrity of your foundation and ensures a dry, healthy living space.