Both begin with a basic structure of lengthwise elements, known as warps , which are then crisscrossed by widthwise elements, known as wefts . In knotted-pile rugs, short pieces of yarn are looped around the weft of the rug with the two loose ends sticking upwards. These vertical fibers form the pile of a rug. The weavers of flatwoven rugs, which have no pile, use colored weft yarns to create their designs in the textile. Familiarity and confidence come from looking at as many examples as possible.
Condition is also of primary importance.
Inspect the condition report to determine that the rug's basic structure is in good shape. The most common serious problem is dry rot , but you should also look for mentions of reweaving or missing areas. Small splits along the edge of a carpet, or in the body of the piece, may be signs that the rug's foundation . A rug's materials will give a good indication of the rug's overall durability and therefore its suitability as floor covering or decoration. Wool, silk and cotton are the main materials used in the manufacture of rugs and carpets.