Attic Window

Y-Seam

Y-Seam Unit

Join three seams at a single pivot point to build angled units without distortion.

1. Mark the seam intersection point on each piece where the three seams will meet.
2. Sew the first seam and stop exactly at the marked pivot point; backstitch once to lock it.
3. Open the layers, rotate the next piece into position, and align raw edges from the pivot outward.
4. Start stitching at the pivot point and sew the second seam, keeping the remaining fabric out of the way.
5. Repeat for the third seam, then press carefully so the Y-junction lays flat without tucks.

Pro tip: Use a shorter stitch length near the pivot and always stop with the needle down at the marked point to keep the junction crisp.