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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.

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 a good idea to install a rug pad under the carpet for your stairs. To make the pad fit, you’ll need to cut one section for each stair tread that’s about one inch narrower than the stair runner so that it won’t be visible once the carpet is installed on top.

It is not recommended to install or stretch a carpet without a power stretcher. Skipping essential tools like a power stretcher and a knee kicker will likely result in an improper installation, leaving you with wrinkles, creases, and an unappealing final look. While a knee kicker can provide some limited stretching for thinner carpets, it is not a proper substitute. Attempting to stretch a carpet by hand or with homemade tools can also shorten its lifespan. For the best results, you should buy or rent a stretcher. If you do not want to use a stretcher, it is better to hire a professional for the installation.