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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.

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.

If you want your carpet to last as long as possible, then yes, you need to install carpet padding. Carpet padding creates a layer of protection between the back of your carpet and the floor beneath it, which decreases friction and reduces wear and tear. Aside from that, carpet padding also helps absorb noise and makes your carpet feel more comfortable underfoot.

Installing carpet over carpet may negatively impact the resale value of your home. While it offers a quick fix, potential buyers may view it as a temporary solution rather than a long-term investment in quality flooring. Properly installed and maintained flooring adds value to a home, so removing the existing carpet and installing new flooring may be a better option to attract prospective buyers and maximize resale value.