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Yes, you can put carpet directly on concrete. However, you need to take certain precautions to ensure the success of the carpet installation. For example, you’ll need to choose a synthetic carpet pad to provide insulation and cushioning and a vapor barrier to prevent moisture from seeping into the carpet.

The difference between a 40-oz. and 60-oz. carpet is the carpet face weight, meaning the 60-oz. carpet weighs 20 ounces more per square yard. When looking at two similar carpets of the same material and type, the 60-oz. carpet face weight likely indicates higher quality and more durability due to heavier carpet fibers. 

Installing carpet padding is mostly a matter of measuring the room and cutting the carpet pad to size with a utility knife. You can save some money on carpet installation costs by doing it yourself. Before installing the carpet padding, you should install the tack strips around the room’s perimeter and prepare the subfloor by cleaning and making any necessary repairs. Then, unroll the carpet pad and cut sections as needed. Staple the carpet pad to the subfloor along the edges, leaving the tack strips exposed.

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.