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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.

You can tell a carpet is good quality if it’s made of a soft, durable material and has a good face weight and density. When comparing two similar carpets, the higher the face weight, the more durable the carpet tends to be. The same goes for carpet density. A higher density of two similar carpets often indicates better quality. The ideal carpet face weight and density values depend on the carpet material and type. 

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.

Most DIYers can learn how to remove carpet although it’s time and labor-intensive. However, if you have glued-down carpet and are concerned about damaging the substrate below, it's best to call a professional carpet remover. Also, removing glue-down carpet is more work than dealing with wall-to-wall carpet because you have to get rid of all traces of the adhesive from your subfloor to prepare it for a new installation.