Pressing Seams in Quilting: Open vs. to the Side — When to Use Each

Few topics in quilting spark more passionate debate than this one: should you press your seams open or to one side? Ask ten quilters and you'll get ten answers — and every one of them will be convinced they're right. The truth is, both methods work beautifully, and the best quilters know when to use each one.

Pressing is one of those skills that seems simple on the surface but has a huge impact on the quality of your finished quilt. The difference between perfect points and "close enough" points often comes down to how (and which direction) you pressed your seams. Let's settle the debate — or at least give you the tools to make the right choice for every block.

Key Takeaways

• ➤"Press to the side" is the traditional default — and for good reason: A seam pressed to one side is stronger because the thread sits behind two layers of fabric, not inside an exposed fold. It's also faster, and the seam creates a natural "ridge" that lets you nest opposing seams together for perfect intersections.
• ➤Pressing open isn't wrong — it's strategic: Some blocks genuinely benefit from open seams, especially ones where many seams meet at a single point (like an 8-pointed star). Open pressing distributes the bulk evenly rather than stacking it all on one side.
• ➤Pressing ≠ ironing: Pressing is a lift-and-set motion. Ironing is a sliding motion. In quilting, you press. Sliding the iron back and forth across seams stretches the fabric and distorts your pieces. Lift, set, press, lift.

First Things First: Pressing vs. Ironing

Before we debate direction, let's get the technique right. Many new quilters treat their iron like they're pressing a shirt — sliding it back and forth across the fabric. In quilting, this is a recipe for stretched, distorted pieces that won't square up properly.

Pressing (correct): Lift the iron, place it down on the seam, hold for 2-3 seconds, lift again. Move to the next section. The iron's weight and heat do the work — your job is just to place it.

Ironing (avoid this): Sliding the iron back and forth across fabric. This stretches bias edges, pushes seams off-grain, and creates inaccurate pieces. Save the sliding motion for your dress shirts.

Method 1: Pressing Seams to One Side

This is the traditional quilting method and the default recommendation for most blocks. After sewing two pieces together, fold both seam allowances to one side (usually toward the darker fabric) and press flat.

Why Press to the Side?

• Stronger seam: With both layers of seam allowance folded together, the stitching is reinforced by two layers of fabric behind it. This is important for quilts that will be washed and used frequently.
• Nesting seams: When you press adjacent rows in opposite directions, the seams "nest" together — one ridge fits snugly against the other. This locks the intersection in place and makes it easy to match points perfectly. You can feel the seams click together before you sew.
• Stitch-in-the-ditch quilting: A seam pressed to the side creates a natural "ditch" — the lower side of the seam — that's perfect for invisible quilting. If you plan to stitch in the ditch, you need seams pressed to one side.
• Speed: It's simply faster to fold both allowances one direction than to carefully open and press both sides flat.

When to Press to the Side

• Standard 4-patch and 9-patch blocks
• Any block where you want to nest seams at intersections
• Sashing seams (press toward the sashing for easy nesting)
• Borders (press toward the border)
• When a pattern instructs you to (follow the arrows!)

Which Direction?

The classic "rule" is to press toward the darker fabric so the seam allowance doesn't shadow through lighter fabric. But honestly, in modern quilting this is less important than pressing for good nesting. Here's a better hierarchy:

1. Press in the direction that allows nesting at the next seam.
2. If there's no nesting concern, press toward the darker fabric.
3. If both fabrics are similar in value, press toward the simpler one (away from points).
4. If your pattern has pressing arrows, follow them — the designer planned the nesting for you.

Method 2: Pressing Seams Open

Pressing open means unfolding both seam allowances so they lie flat on either side of the stitch line. The seam is spread open like a book, with the stitching visible down the center.

Why Press Open?

• Reduces bulk at intersections: When 4, 6, or 8 seams all meet at one point (like the center of a pinwheel or star), pressing to the side can create a thick lump of layered seam allowances. Pressing open distributes the fabric evenly so the intersection lies flat.
• Flatter quilt top: In blocks with lots of seams close together, open pressing creates a smoother surface overall. This is especially noticeable in blocks like the Kaleidoscope, Lone Star, or Double Wedding Ring.
• Better for quilting over seams: When you quilt across seam intersections, a bulky lump can cause skipped stitches or broken needles. Open seams create a smoother path for the needle.

When to Press Open

• Blocks where 6 or more seams meet at a center point
• Y-seams and curved seams
• Blocks with many bias edges (open pressing reduces stretching)
• When your pattern specifically calls for it
• When quilting over thick intersections causes machine problems

The Trade-Offs

• Slightly weaker seam: The stitching is exposed in the fold rather than protected behind two layers. For bed quilts that will be washed frequently, this means the thread takes more stress. (In practice, quality thread and stitching make this a minor concern.)
• No nesting: You lose the ability to feel seams click together, which makes matching intersections slightly harder. Use pins instead.
• No ditch to stitch in: Seams pressed open don't create a natural groove for stitch-in-the-ditch quilting. You'll need to quilt 1/4" from each side of the seam or use a different quilting technique.
• Takes more time: You need to carefully open and press both sides flat, which is slower than folding to one side.

Side-by-Side Comparison

The Finger Pressing Option

Some quilters prefer to finger-press seams before hitting them with the iron. Using a finger-pressing tool (like a Hera marker, a wooden seam creaser, or even a thumbnail), you crease the seam in the desired direction right at the machine. This is faster than getting up and walking to the iron between every seam, and you can do the final iron press once the whole block is assembled.

Finger pressing is especially popular for chain piecing, where you're sewing dozens of units in a row and don't want to stop after each one. It's not a replacement for a proper iron press — you'll still need to press the final block — but it keeps your workflow moving.

Common Pressing Mistakes

• Using steam on bias edges. Steam is great for setting seams, but on bias-cut edges, it can stretch fabric permanently. Use a dry iron on bias edges, or use steam very briefly and let the fabric cool before moving it.
• Pressing from the wrong side. Always press from the right side (the front) of the fabric so you can see exactly where the seam folds. Pressing from the back can create tiny tucks along the seam that you don't notice until the block is assembled.
• Not pressing consistently within a block. Once you choose a direction for a seam in a block, carry that through to all matching seams. Inconsistent pressing leads to mismatched intersections.
• Pressing too hard. Let the iron's weight and heat do the work. Pushing hard can stretch fabric and create impressions of seam allowances on the front of the quilt (called "seam shadow").
• Skipping pressing entirely. Some quilters try to "finger press and go." Don't. A proper iron press locks seams flat and creates accurate pieces. Finger pressing is a supplement, not a replacement.

Frequently Asked Questions

Should I use steam?

For most cotton quilting fabric, a little steam helps seams set crisply. However, avoid heavy steam on bias edges (it can stretch them) and on blocks that aren't fully assembled yet. Many quilters use a dry iron during assembly and steam only for the final pressing of a completed block.

What about pressing with starch?

Starch (or a starch alternative like Best Press) adds body and crispness to fabric, making it easier to handle and cut accurately. It's especially helpful for floppy fabrics or bias edges. Spray it on lightly and press it in. Just be aware that heavy starch can attract bugs during long-term storage, so wash it out before storing quilts.

Can I change methods mid-quilt?

Absolutely. Many quilters press to the side for simple blocks and switch to pressing open for complex blocks within the same quilt. Just be consistent within each individual block so the seams nest properly at row junctions.

My seam allowances show through my light fabric. What do I do?

This is called "seam shadow" or "shadowing." Trim your seam allowances to 1/4" (they may be wider if you used a generous seam allowance) and press toward the darker fabric. If shadowing is still visible, consider using a slightly darker background fabric or pressing that specific seam open to split the bulk.