What is a Weft?

Rug Structure: What is a weft?

Wefts are the strands that run from side to side on the loom.
The weaver inserts weft after each row of knots. Most rugs have 2 shots of weft after each row of knots but we see one in Hamadan rugs and more in some rugs.

"The widthwise or horizontal structural elements of a rug, passed over and under the warps to form pile rugs' basic structure or foundation and flat-woven rugs' design." http://sothebys.ebay.com/
Carpet wefts are usually cotton or wool and may less frequently be silk and very rarely flax.
A simple repair now can protect the value in a carpet. Still damage dives us a different perspective on structure.