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If you have a concrete subfloor, you must secure the carpet padding with adhesive or glue. However, if you have a wooden subfloor, use staples instead. Removing a glued-down carpet can be difficult and time-consuming, so it’s best to avoid glue when possible.

Carpet padding costs an average of $510 to purchase and install in a 225-square-foot room. The price can range from as low as $170 to as much as $850, depending on the brand, the thickness, and the labor cost. Although carpet padding will increase the overall cost of carpet installation, it also helps the carpet hold up longer, reduces noise in the room, and provides more insulation.

If you’re using a carpet runner instead of a traditional carpet, pay attention to your width measurements. Instead of measuring the total width of your staircase with 2 added inches for foldover, simply measure the width you’d like the runner to cover. Runners generally come in standard sizes, so you may need to approximate what would look best in your space.

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.