Foundation single crochet builds a chain edge and a row of single crochet at the same time. It is useful when you want to check a strip’s width as you work, or when a separate starting chain feels much tighter than the rows above it. The key is remembering that every foundation stitch contains two small operations.
Stitch terminology: This guide uses US names. US single crochet is UK double crochet; US half double is UK half treble; US double is UK treble. See the full US/UK reference.
Recognise the chain part and the stitch part
In an ordinary first row, you make all the chains first and crochet into them later. Here, you create one base chain, finish the single crochet above it, then use that new base to begin the next unit.
Look for two edges on the growing strip. One contains the top Vs of the single crochets; the other contains their linked foundation chains. The hook returns to the foundation edge while you are building the strip, not to the top of the previous single crochet.
Make the first foundation stitch
- Chain two. Insert the hook into the second chain from the hook and draw up a loop.
- Yarn over and draw through one loop. This creates the base chain; two loops remain on the hook.
- Yarn over and draw through both loops. One foundation single crochet is complete.
Place a small marker through the base chain you just made. It gives you a target for the next insertion while the structure still feels unfamiliar. The starting chains are setup; count the completed foundation single crochets across their tops.
Continue through the base, not the top
Insert under the two strands of the marked base chain, draw up a loop, make the next base chain by pulling through one loop, then finish the single crochet by pulling through two. Move the marker into the newly created base if that helps.
Do not pull the base chain excessively tight. It needs enough room for the next insertion and for the finished edge to relax. A very short base with a tall stitch above it can make the strip curl.
Use a twelve-stitch practice strip
Make twelve foundation stitches and count twelve top Vs. Chain one, turn, then single crochet in each of those twelve stitches. The turning chain does not count in this exercise. Work a few more ordinary rows to see how the foundation behaves beneath the fabric.
Compare it with a second strip made from thirteen chains and twelve single crochets. Use the same yarn and hook. You are comparing the edge feel, not trying to prove that one method is always better.
Know when a substitution needs more thought
A pattern that begins with a plain row of single crochet is a straightforward candidate. A pattern that works on both sides of the starting chain, builds shells immediately, or needs a particular foundation-loop placement deserves a closer reading.
Likewise, do not add a foundation row beneath a pattern whose first row is already counted in the stated length without considering the extra height. Replacing an existing row and inserting an additional row are different changes.
Check width after the edge has settled
Measure the sample after the intended washing or blocking routine, following the yarn label. Record both the foundation count and the resulting width. If the body fits but the edge still pulls in, adjust the foundation technique on a new sample before beginning the full piece.
Continue learning
Try a taller foundation · Keep a separate chain with a neat edge · Check tension
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