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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.

Carpeting has a few benefits on stairs in addition to being a cost-effective floor covering. It absorbs sound, dampening footsteps. It also provides additional traction, which is especially important if you install linoleum floors, epoxy flooring, or any other floor covering that can become slippery if you’re wearing socks. Therefore, carpets can help prevent slips. 

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.

Stain-resistant carpet might be worth it for your household if you have children or pets and expect spills to happen. While it may cost more than you expected upfront, you may save money in the long run if you have to replace your carpet less frequently (thanks to stains not absorbing down into the fibers).