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A widely recognized method for waterproofing a basement involves the application of a waterproof membrane or the implementation of a drainage system. This approach addresses the primary concern of water infiltration by creating a barrier that prevents moisture from entering the basement. The waterproof membrane can be applied to the exterior walls of the foundation, effectively stopping water from penetrating the concrete or masonry. In addition, a drainage system, such as French drains or sump pumps, can be installed to redirect any water away from the foundation, further enhancing protection against flooding and water damage.

Using insulation on the outer walls, while thermally beneficial, does not specifically prevent water from entering the basement. Similarly, installing a backup generator is not relevant to waterproofing and serves a different purpose, such as providing power during outages. Lastly, while using concrete sealants may offer some level of moisture resistance, they do not provide the comprehensive solution that a waterproof membrane or drainage system offers, especially in cases of significant water exposure. Thus, the reliability and effectiveness of a waterproof membrane or drainage system make it the preferred choice for effective basement waterproofing.