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It is normal to glue carpet down, though it’s not the only or the most popular method of installing carpet. Modern techniques include tack strips and stretching the carpet, but you might still find glued carpet in older homes or a home with a DIY’d past. Removing a glued-down carpet will be harder compared to other methods of installation.

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.

Decent carpet will last around 10 years on stairs. Some less durable carpets, like polyester, will only last five years on stairs. The ideal carpet, like wool or nylon, can last about 15 to 25 years. You’ll know when to replace it when it starts wearing down. You may have to replace it sooner if it's stained, whether due to water damage or pets.

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.