A carpet is commonly made in widths of 12 feet and 15 feet. It is fixed to a floor over a cushioned underlay using nails, adhesives, or occasionally decorative metal stair rods , thus distinguishing it from rugs or mats, which are loose-laid floor coverings.
Carpeting which covers an entire room area is usually referred to as ‘wall-to-wall’, but a carpet can be installed over any portion thereof with use of appropriate transition mouldings where the carpet meets other types of floor coverings.
Carpet tiles are also available, typically in a size of 50 centimetres (20 in) square. These are usually only used in commercial settings and can be easily removed and refixed to allow rearrangement in order to spread wear.