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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 is normal to glue carpet down, though it’s not the only or the most popular method of installing carpet. Modern techniques include tack strips and stretching the carpet, but you might still find glued carpet in older homes or a home with a DIY’d past. Removing a glued-down carpet will be harder compared to other methods of installation.

If the stairs are already covered in carpet, you will need to remove the old carpet and possibly the carpet pad. Any damage to the stairs like cracks, loose boards, or creaky treads may also need to be repaired. You may also want to sand and refinish or paint wood stairs before installing a carpet runner.

Yes, there are plenty of ways to lay stair carpet without grippers, such as carpet adhesive, magnetic flooring, or staples. Adhesive may be your best bet if you don’t want grippers, as it will most likely stick the best and cause the least amount of damage. However, if you’re looking for an easy fix, grippers are one of the best solutions you can purchase.