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A subfloor's lifespan can range from 30 years to the entire life of the house, which is often between 50 and 100 years. The actual longevity depends on the material and its protection from damage. For example, while OSB may last longer than plywood, it is not the best choice for heavy flooring like ceramic tile. The most critical factor is moisture; a subfloor that avoids water damage, mold, and termites can last for decades. However, prolonged exposure to moisture will cause it to warp, rot, or grow mold, significantly shortening its life.

There are a few different types of finishes to choose from for the final step of the project. 

Water-based polyurethane sealants emit fewer odors and fumes but dry quickly, which can pose a challenge when trying to get a smooth coat. Oil-based polyurethane sealants let out more odors and fumes into the air (it’s especially important to wear a respirator if you choose this type), but they take longer to dry, which can be more forgiving during the finishing step. 

Some may prefer wood oil to polyurethane because rather than creating a layer, it becomes part of the wood. Wood oil takes longer to dry, and is less resistant to wear and tear; however, it creates a natural-looking result by enhancing the grain of the wood. 

Using too much soap or floor cleaner can leave your laminate floors looking dirty or cloudy after mopping. Only use a teaspoon of soap or cleaning solution in a gallon of water. Additionally, always be sure to sweep or vacuum laminate floors before mopping to ensure you pick up dried grit, hair, and dust that can be harder to catch with a wet mop.

Common problems with laminate flooring include surface-level scratches, dents, warping, and separating seams. Scratches can be caused by dragging heavy items like furniture or from not using a mat under rolling office chairs. Dents can occur from regular wear and tear or from dropping heavy objects on the floor. Most of these issues can be prevented with regular cleaning and moisture control, and many are fairly easy to fix for a beginner DIYer.