How to Do a Corrugated Rib Knitting Stitch

Corrugated ribbing uses two colors for more visual interest than normal ribbing.

Corrugated ribbing, also called two-color ribbing, is a knitting technique where two colors are used in a ribbed pattern. One color, called color A, is used for all knit rows, while another color, color B, is used for all purl stitches. Corrugated ribbing uses the same stitches as one-color knitting, but it is more visually interesting because of the use of two colors. It also is less elastic than one color knitting, something to keep in mind if you plan to use corrugated knitting as a trim on garments like mittens, hats or socks that usually require stretchy edging.

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2 colors of yarn
Knitting needles
Scissors

Instructions

- 1
  
  Cast on 20 stitches using one of your colors of yarn. This will be color A.
- 2
  
  Knit the first two stitches of the next row with color A.
- 3
  
  Join the second color of yarn, color B, by using it to purl the next two stitches. Leave a long tail of color B yarn that can be woven in later.
- 4
  
  Continue to work in a pattern as follows: knit two stitches with color A, purl two stitches with color B to the end of the row. You will notice short unknitted lengths of yarn where you have knitted or purled in the opposite color. Keep these lengths, called floats, on one side of your knitting, which will be the wrong side of your work.
- 5
  
  Complete the next row by purling two stitches in color A and knitting two stitches in color B until the end of the row. Repeat for the next row.
- 6
  
  Keep knitting and purling until your piece measures about 5 inches from the cast-on edge. Cast off using the color of your choice. Cut the yarn and weave in your ends.