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No, thick carpet padding isn’t necessarily better than thinner padding. The appropriate padding thickness will depend on the type of carpet and the amount of foot traffic in the area. 

For example, thick padding works well in low-traffic areas, like bedrooms, where you have soft and plush carpeting. However, thick carpet padding can damage low-pile carpet, which is used in the busiest parts of your home (like hallways and entryways). For that reason, it’s best to use thinner, heavier padding underneath carpet in high-traffic areas.

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.

Nylon carpet is widely considered one of the most durable and longest-lasting options, typically lasting 12 to 15 years. Its durability comes from its high resistance to wear, tear, stains, fading, and abrasions. It also resists liquid spills, insects, mold, and mildew, making it ideal for high-traffic areas like living rooms and hallways. For even greater longevity, frieze or Berber carpets are excellent choices that can last up to 20 to 25 years.

Beyond the material, a carpet's construction is key to its durability. Low-pile carpets with short, tight loops hold up better against wear than high-pile options. As a synthetic material, nylon is available in a vast range of colors and styles and often feels remarkably soft.

Installing carpet over carpet may affect the warranty of the new carpet. Check with the manufacturer or retailer regarding their warranty policies. Many warranties stipulate specific installation guidelines, and installing carpet over carpet may not comply with these requirements. Voiding the warranty due to improper installation methods can leave you without help in case of issues or defects with the new carpet.