The best floor molding for a bathroom is moisture-resistant PVC, vinyl, waterproof composite, or properly sealed exterior-grade solid wood, combined with waterproof silicone caulking along all edges. Because bathrooms experience high humidity, water splashes, and frequent wet mopping, traditional medium-density fiberboard or unsealed wood moldings will quickly swell, warp, or rot. Waterproof polymer-based baseboards and transition strips withstand water exposure indefinitely without degradation, protecting the vulnerable expansion joints around tub surrounds, showers, and flooring transitions from water damage.
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