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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.

It’s possible to reuse household materials to cover floors, but they won’t provide the same level of protection as dedicated materials. They’re also more difficult to tape down and more prone to slipping and bunching up—and any dirt or debris on them could scratch or stain your floors. That being said, extra materials like these can be useful for protecting the sides of furniture and placing in areas that could use added protection.

The need to replace your flooring depends on the type of flooring and the amount of wear and tear it experiences through foot traffic. For example, you should replace carpet every ten years, but other, more durable options like tile can last up to 30 years. It’s best to speak with your flooring installation professional to determine the best course for replacing your flooring. 

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.