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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.

Whether you install flooring before or after kitchen cabinets depends primarily on the type of flooring you are using. For materials like hardwood, tile, and sheet flooring, the best practice is to install the flooring first. This ensures the cabinets are installed at the correct height and on a stable surface. However, you should not install cabinets on top of floating floors, such as laminate or luxury vinyl plank (LVP). These types of flooring need room to expand and contract with temperature and humidity changes. Placing heavy cabinets on top can restrict this movement, potentially causing the floor to buckle and making the cabinets unstable. For floating floors, install the cabinets first and then lay the flooring up to them. Other reasons to consider installing cabinets before the flooring include saving money on materials (since you won't need flooring under the cabinets) and avoiding potential damage to your new floor during cabinet installation. Additionally, installing cabinets directly on the subfloor might prevent voiding your flooring's warranty.

When installing carpeting on your steps, start at the top and work your way to the bottom. That way, you can easily control the carpet and create a better seal. This approach prevents the carpet from bunching up or creating wrinkles as you work. You’ll have better leverage over it as gravity helps guide it down each step.

While carpet over carpet may provide some additional insulation and soundproofing benefits, it's not as effective as other methods. Layering carpets can add a modest buffer against noise and temperature fluctuations, but it's limited compared to installing thicker carpet padding or using specialized soundproofing materials. For optimal floor insulation and soundproofing, consider alternative solutions tailored to your specific needs and budget, such as adding additional padding or soundproofing underlayments beneath the carpet.