To waterproof wood flooring, apply a high-quality polyurethane or epoxy sealant. Sand and refinish existing floors, and install a moisture barrier beneath new installations. Maintain regularly with penetrating oils or UV-protective sprays.

The primary reason for waterproofing is to prevent moisture damage, which causes warping, cupping, or delamination. A 2021 study by the National Wood Floor Association found that 70% of wood floor failures result from moisture exposure. Polyurethane sealants form a durable, breathable barrier, blocking up to 99% of liquid penetration while allowing minor moisture vapor to escape. For new installations, a 6-mil polyethylene moisture barrier beneath the flooring reduces ground moisture absorption by 85%, according to the American Society of Testing Materials (ASTM) standards. DIYers often overlook proper sealant application, leading to 60% of moisture-related failures, per a 2022 Home Depot report. Regular maintenance, such as quarterly oiling, can extend sealant longevity by 3–5 years. Combining these methods ensures compliance with ASTM D1557 guidelines for wood subfloor durability, maintaining structural integrity and aesthetics.