Using 1 Inch x 3-1/2 Inch Rectangles in EPP Projects
By Paper Pieces for English Paper Piecing | Published: 2026-10-20
Category: How-to Guides
Learn how to use 1" x 3-1/2" rectangles for English paper piecing, including common problems, causes, and fixes for straight-line EPP.
Quick Answer
If your 1" x 3-1/2" rectangles are twisting or leaving gaps, the fix is usually in how you baste and join the long seams—not the paper itself. Work with smaller batches and pin the ends to keep everything aligned.
Why Long Rectangles Are Tricky
In English paper piecing, most shapes are small and chunky—hexagons, diamonds, jewels. A 1" x 3-1/2" rectangle is different: it's a long, narrow shape with a 3.5:1 aspect ratio. That length makes it prone to twisting, especially when you join multiple rectangles end-to-end or alongside other shapes.
The length also means more fabric to ease around the paper, so any slack in your basting shows up as a visible bubble or a stretched seam. Understanding this quirk helps you anticipate problems before they happen.
Choosing the Right Seam Allowance
Paper Pieces offers these rectangles with no seam, 1/4" seam, and 3/8" seam options, plus windowed versions. The seam allowance you pick affects how bulky your intersections get.
If you're joining rectangles to other small EPP shapes, a 1/4" seam is usually enough. If you're using heavier fabrics or plan to quilt densely, the 3/8" seam gives you more fabric to work with—but it also adds bulk at the corners. For most projects, 1/4" is the sweet spot.
Diagnosing Common Problems with 1x3.5 Inch Rectangles
- Symptom: Seams are wavy or puckered: You notice that after joining several rectangles, the long seams ripple instead of lying flat. Check your basting tension—too tight pulls the fabric, too loose leaves slack.
- Likely cause: Fabric stretched along the long edge: The 3-1/2" side is long enough that handling it repeatedly can stretch the bias or the grain, especially if you're pulling the fabric as you baste. Handle the paper pieces by the edges, not the middle, and avoid tugging.
- Corrective action: Re-baste with a looser tension and pin the ends: Remove the basting and redo it, using a whipstitch that doesn't pull tight. When joining, pin the two ends of the rectangles together first, then work the seam in small stitches.
- When to stop or choose another option: If you've re-basted twice and still see twisting, consider switching to a wider seam allowance (3/8") for more fabric control, or use windowed papers if you want to remove the paper before joining and need a precise opening. If the problem persists, test on a scrap piece before committing to a full project.
Product Facts
- 1" x 3-1/2" Rectangle: This 1" x 3-1/2" rectangle is available in Small (48 pieces), Large (288 pieces), and Bulk (576 pieces) packs, with seam options of No Seam, 1/4", and 3/8", plus windowed versions. Choosing the right pack size and seam option lets you match the paper to your project's scale and fabric weight, reducing bulk and waste.
1" x 3-1/2" Rectangle
