09/28/2026
If a triangle unit suddenly looks wavy or a little larger than it should, the problem may be the bias edge.
Fabric is most stable along the straight grain. When it is cut diagonally across the grain, it has more stretch. That diagonal edge is called the bias. You will find it on half-square triangles, setting triangles, and many angled blocks.
Handle bias edges gently, avoid pulling them through the machine, and press with an up-and-down motion. If a unit needs trimming, place it flat on the cutting mat instead of tugging it into shape. Those small habits can make a big difference when it is time to join the blocks.
Which quilt block taught you to respect the bias?