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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.

You can expect your carpet protection to last about six months to two years. It will last longer in low-traffic areas (compared to busy areas, where your carpet experiences more wear and tear). Once the protector wears off, you’ll need to call your carpet contractor to reapply the stain protection treatment and revive your carpet. 

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.

Decent carpet will last around 10 years on stairs. Some less durable carpets, like polyester, will only last five years on stairs. The ideal carpet, like wool or nylon, can last about 15 to 25 years. You’ll know when to replace it when it starts wearing down. You may have to replace it sooner if it's stained, whether due to water damage or pets.