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While it's possible to cover asbestos tile with carpet, it's not recommended. Encapsulating tile beneath carpet doesn't eliminate the health risks. Over time, the asbestos tiles could degrade, releasing fibers into the air and potentially contaminating the carpet. Disturbance during carpet installation or removal might also release fibers.

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.

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.

No, thick carpet padding isn’t necessarily better than thinner padding. The appropriate padding thickness will depend on the type of carpet and the amount of foot traffic in the area. 

For example, thick padding works well in low-traffic areas, like bedrooms, where you have soft and plush carpeting. However, thick carpet padding can damage low-pile carpet, which is used in the busiest parts of your home (like hallways and entryways). For that reason, it’s best to use thinner, heavier padding underneath carpet in high-traffic areas.