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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.

Yes. You can tile over tile if the old tile is in good shape, but this will also create a thicker floor. As a result, you may have to remove and readjust baseboards and other room trimmings and potentially even raise door heights to work with the higher floors. In most projects, it’s best to remove the old tile before installing a new tile floor.

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.

To clean a subfloor after removing carpet, start by removing any leftover debris, such as stuck-on underlay, nails, or staples. Next, thoroughly vacuum the subfloor to eliminate dust, dirt, and loose particles. If adhesive residue remains, you can use an adhesive remover, a scraper, or a sander to gently lift it off. Finally, clean the surface by mopping or wiping it down with a damp rag and allow it to dry completely. This preparation is essential for ensuring new flooring adheres properly and to prevent bumps or wrinkles from forming.