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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.

If you don’t put padding under your carpet, the carpet won’t be protected from wear on the underside. This could result in a shorter life span for your carpet and increased carpet repair costs over time. An unpadded carpet can also be less comfortable to walk on, depending on your subfloor and the type of carpet.

The average cost to install new flooring is around $3,162, with a typical price range between $1,530 and $4,860. On a per-square-foot basis, you can expect to pay an average of $3 to $22, including installation. Several factors influence the total price, including the flooring material, project size, geographic location, and any special features. Material choice is a significant cost driver; vinyl plank, linoleum, and carpet are on the lower end ($3 to $7 per square foot), while stone, tile, and hardwood are more expensive, with hardwood reaching up to $22 per square foot. Prices can also vary by region, and installing flooring on stairs will add to the cost, typically ranging from $11 to $160 per step.

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.