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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.

If you have a dark carpet and are going for a lighter look, you should replace it, rather than dyeing, since you can only go darker with dye. If your stains are too heavy to mask with carpet dye or the carpet is more than 10 years old, you should also consider replacing it.

While not always required, experts recommend removing baseboards before removing old carpet and installing a new one. This practice leads to a smoother process and a cleaner, more professional-looking finish. Removing the baseboards allows for a seamless carpet installation without the risk of damaging either the carpet or the trim. It also provides a good opportunity to repaint or stain the baseboards and inspect the underlying wall for any issues. If you prefer a quicker option, you can carefully cut the old carpet along the edge of the baseboards, but this may result in a less polished installation for the new carpet.

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.