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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.

Experts advise that replacing carpeting can bring a 50% to 80% return on investment. However, new carpeting doesn’t necessarily add value to your overall home value. Because flooring value heavily depends on taste, it can be tricky to determine whether new carpet will increase your home sale price. Carpeting tends to be a renovation that increases overall comfort and aesthetics for your home, but it’s not a big factor in value.

Some flooring companies recycle old carpet after replacing it. The broader flooring industry has been moving toward recycling more carpet material. However, whether an individual carpet gets recycled is up to the flooring company that removes it. When gathering quotes for new flooring in your area, ask each company about removal options and what they do with the material.

Installing carpet padding is mostly a matter of measuring the room and cutting the carpet pad to size with a utility knife. You can save some money on carpet installation costs by doing it yourself. Before installing the carpet padding, you should install the tack strips around the room’s perimeter and prepare the subfloor by cleaning and making any necessary repairs. Then, unroll the carpet pad and cut sections as needed. Staple the carpet pad to the subfloor along the edges, leaving the tack strips exposed.