Joining Foundation Paper Piecing Sections
Before You Begin
Skill Level: Intermediate
Technique: Foundation Paper Piecing
Time Required: About 15–20 minutes
Tools Needed: Foundation pieced sections, pins, sewing machine, iron
Introduction
Many Foundation Paper Piecing patterns are divided into smaller sections before they're joined into a complete block. Breaking a block into sections makes it easier to sew complex designs, but joining those sections accurately is where many quilters lose crisp points and clean color transitions.
The good news is that the paper foundation is still attached, giving you a built-in guide for aligning everything perfectly.
Step 1 – Leave the Paper Attached
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Don't remove the foundation paper before joining sections unless your pattern specifically tells you to do so.
The paper helps stabilize the units and preserves the exact shape while you're matching seams.
Step 2 – Identify the Match Points
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Lay the two sections side by side and identify the points where seams or color changes need to line up.
These intersections are much more important than matching the outside edges of the sections.
Step 3 – Pin Through the Sewing Line
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This is the method I use whenever I join Foundation Paper Piecing sections.
Starting with the first section, insert a pin straight through the exact sewing line at the point where two fabrics meet.
Without removing the pin, place the matching section underneath and continue pushing the pin through the corresponding point on the sewing line of the second section.
Because the pin passes through the sewing line on both sections, it locks those points together exactly where they'll be stitched.
Add additional pins as needed to hold the sections together without shifting.
Step 4 – Sew the Sections Together
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With the sections pinned, sew directly on the seam line using your usual seam allowance.
Remove the pins as you approach them rather than sewing over them.
Step 5 – Check Before Pressing
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Before pressing the seam open, check the front of the block to make sure the points and color changes align as expected.
If something shifted, it's much easier to correct before pressing than after the seam has been set.
Once you're happy with the alignment, press the seam according to your pattern instructions.
My Tip
When joining Foundation Paper Piecing sections, I almost never worry about whether the outside edges line up perfectly first. My priority is always matching the sewing lines where colors change or points meet.
If those sewing lines are aligned, the outside edges almost always fall into place naturally.
Frequently Asked Questions
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Usually no. The paper helps maintain the shape of the units and makes accurate alignment much easier.
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Instead of matching the raw edges, match the actual sewing lines. Inserting a pin through the seam intersection on both sections is one of the most accurate ways to keep everything aligned.
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Start by pinning the important seam intersections. Add additional pins between them if needed to keep the sections from shifting while sewing.
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Check that each section was trimmed accurately before joining. Small trimming errors can become more noticeable when assembling multiple sections.
Continue Learning
Foundation Paper Piecing Basics
Removing Foundation Papers (Coming Soon)
Accurate Quarter-Inch Seam Allowance
