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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.

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.

Flooring transition strips can be secured to the subfloor using glue, nails, or screws. For a more secure installation, especially in high-traffic areas, using screws or nails is recommended as it reduces the risk of slippage. However, if aesthetic appeal is a priority, glue provides a cleaner, more seamless finish without any visible holes or screw heads.

There are a few different types of finishes to choose from for the final step of the project. 

Water-based polyurethane sealants emit fewer odors and fumes but dry quickly, which can pose a challenge when trying to get a smooth coat. Oil-based polyurethane sealants let out more odors and fumes into the air (it’s especially important to wear a respirator if you choose this type), but they take longer to dry, which can be more forgiving during the finishing step. 

Some may prefer wood oil to polyurethane because rather than creating a layer, it becomes part of the wood. Wood oil takes longer to dry, and is less resistant to wear and tear; however, it creates a natural-looking result by enhancing the grain of the wood.