In the context of carpets, what does 'smiling' refer to?

In the context of carpets, 'smiling' specifically refers to the phenomenon where there is a separation of rows, particularly noticeable when bending over areas such as a bullnose on stairs or the edge of a carpet. This is often a result of improper installation or inadequate tension during the stretching of the carpet. As the carpet bends over an edge, such as a stair or a rounded surface, the rows of tufts can pull apart or create gaps, which creates a visual effect that resembles a 'smile.' This can detract from the overall appearance of the carpet and indicates a need for proper installation techniques or adjustments.

Understanding this term is crucial, as it highlights the importance of expert installation to avoid issues that degrade the appearance and longevity of the carpet.