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In most cases, you do not need to put padding or underlayment under carpet tiles. Unlike traditional carpet, which requires a separate pad, carpet tiles are designed to be installed directly onto a firm subfloor like plywood, concrete, or tile. Many carpet tiles come with a built-in underlay and attach with peel-and-stick adhesive, double-sided carpet tape, or glue. For a more comfortable, cushioned feel, especially in residential settings, you can opt for padded carpet tiles that have a thicker underlay attached. While it's generally not recommended to install a separate pad, a compact underlayment might be used in some situations, though this typically requires professional installation. An acoustic underlay may also be considered in commercial spaces or multi-level homes where noise reduction is a priority.

In most cases, carpeting isn’t kind to the wood that it’s attached to. Most carpet installation uses adhesive or nailing strips, both of which will damage wood. Conversely, you can choose to use an adhesive designed to be removed from wood, in which case carpeting can actually protect your hardwood stairs.

New flooring costs quite a bit, so longevity is important to think about. Concrete generally has the longest life span, but it’s not always a good solution for homes with wooden subfloors. That said, hardwood floors and stone floors can last up to 100 years, and you can refinish or restore them to remove imperfections from daily wear.

The lifespan of tile flooring can vary significantly based on the material and maintenance. Generally, tile flooring can last anywhere from 10 to 30 years, but high-quality, well-maintained ceramic tile can last 75 to 100 years. To achieve a longer lifespan, you should clean the tiles and grout regularly, reseal the grout annually, keep the floor dry, and avoid placing extremely heavy items on it to prevent cracking. Choosing a high-quality tile (Grade 1) will also contribute to its longevity.