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There could be several reasons why your carpet padding has adhered to the floor. Some of the most common reasons include:

• There was intentional gluing or stapling to the surface.

• The polyurethane and floor bonded over years of wear.

• Pet urine, spills, or other substances leaked through the carpet and created a sticky surface.

If the carpeting in the home has not been changed in a long time, clearing off the padding underneath could be difficult. Pet urine can wreak havoc on carpeting and the flooring underneath. If you plan to reinstall carpeting, remember to use proper cleaning techniques for removing pet urine odors to prevent future problems.

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.

If you have a dark carpet and are going for a lighter look, you should replace it, rather than dyeing, since you can only go darker with dye. If your stains are too heavy to mask with carpet dye or the carpet is more than 10 years old, you should also consider replacing it.

The best underlayment for carpet on concrete is a sponge rubber underlayment. This type of carpet padding is durable enough to endure wear and tear on hard concrete yet soft enough to provide comfort underfoot. It also creates insulation from sound and temperature, providing warmth despite the concrete’s cold surface.