What Grain Is and Why It Matters
You've got fabric picked out. Before you cut a single piece, we need to talk about grain. This is the thing that wrecks your runner without you ever knowing why.
Short version. Woven fabric is threads running two directions. Threads running the length of the fabric, parallel to the selvage (that tightly-woven edge on both sides of the bolt), are the lengthwise grain. Threads running side to side, selvage to selvage, are the crosswise grain. Lengthwise grain has almost no stretch. Crosswise grain has a little. Then there's bias, the diagonal, 45 degrees off both grains, and that stretches like crazy.
Cut your pieces on the straight grain, lengthwise or crosswise, doesn't matter much which for a beginner runner. Line them up with the edges of your fabric, not at some random angle. Cut off-grain and the fabric doesn't know how to hold its shape. It'll stretch when you don't want it to, pucker when you press it, and pull your whole block out of square.
How to find it
Look at your fabric. If you've still got a selvage edge, that's your landmark. Lengthwise grain runs parallel to it. If you've already cut your selvages off, give the fabric a gentle tug both directions. The direction with almost no give is lengthwise. A little more give is crosswise. If it stretches a lot, you've found bias, and that's not where you want your cutting lines.
The lines on your cutting mat and on your ruler are there to keep cuts square to the grain, not just square to each other. When you line up a strip, check that your ruler is parallel to the selvage or to a visible thread line, not just parallel to the edge of the piece you already cut. If that edge was off, you'll just perpetuate the mistake in a straight line.
Why this matters for hand quilting
You'll press these seams a lot. Pressing on grain lays flat and stays flat. Pressing on bias or a mixed-up grain stretches things out of shape, and once a block is stretched it won't go back. You end up chasing it with the iron, and it still won't sit right when it's time to layer and quilt.
It also matters for how the finished piece hangs and lies on a table. Off-grain pieces ripple. They won't lie flat no matter how much you steam them.
The block that taught me this
My very first block, I didn't know grain was a thing. Nobody told me, and it didn't occur to me to ask. I cut my squares wherever they fit tightest on the fabric, trying to save every last inch. Some ended up on the bias without me knowing.
I sewed it together, pressed it, and the whole block bowed. Like a potato chip. I pressed that thing probably forty times, sure I was doing something wrong with the iron, sure the right technique would flatten it. It never did. Eventually I admitted it was cooked and started over with new squares, cut on grain this time. Flat the first press. That's when it clicked.
I'm telling you now so you don't spend forty presses finding out the hard way like I did.
What to do at your table
Before you cut anything for your runner:
- Find the selvage or figure out your grain direction by feel.
- Fold your fabric so the grain lines run parallel, not skewed. This is where a lot of people go wrong without noticing.
- Line your ruler up with a grain line, not just an edge.
- Cut.
Don't overthink whether to use lengthwise or crosswise grain for a beginner project. Either is fine. They behave close enough alike. Pick one, stay consistent within a piece, move on. Not a decision worth twenty minutes. Save your attention for watching the grain line, not agonizing over which straight grain to use.
One more thing. Dry air and low humidity mean fabric up here can feel stiffer off the bolt than what you're used to, which can make grain easier to read by feel once you know what you're feeling for. Small silver lining.
Before next time
Grab a scrap and practice finding the grain by feel. Tug it both directions and feel for where it doesn't stretch. Bring it with you and I'll check you're reading it right before we cut for real.