How to Make Continuous Bias Binding
Cutting and seaming together bias strips is the standard technique for custom bias binding. And, it works great. Continuous bias binding is one of those “two birds with one stone” techniques. Simply stated, it’s a technique for pre-sewing bias binding strips before you actually cut them. The process eliminates having to sew a bunch of strips together end-to-end to get the length you need to go around your project.
It’s a little bit like the ancient art of origami. You start out with a flat square (or rectangle), and after a few folds and flips here and there, you have something completely different, very dimensional, and quite useful.
If you are brand new to working with binding, take a look at the Sew4Home tutorial: Bias Binding: Figuring Yardage, Cutting, Making, Attaching. It gives you all the handy formulas, tips, and techniques for the four key steps outlined in its title, discusses single fold versus double fold, and lists the tools to have on hand.
Once you’ve done the “fabric math” (using our tutorial or your own experienced brain power)… onward we go to continuous bias binding.
If you review continuous bias binding methods in quilt books, as well as on websites and blogs, you’ll find a few variations in the actual steps for the technique. Using our experience, we captured what we feel is the best of the bunch: a single set of steps that provides a clear and simple approach.
NOTE: We’re using a plain fabric and a permanent marker so you can clearly see the marking steps. However, YOU should use a fabric pen or pencil that can be easily wiped away or that will vanish with exposure to the air or the heat of an iron.
Lay your fabric on a cutting mat, right side down.
Cut the predetermined size square from your binding fabric (again, the tutorial mentioned above gives you the formulas needed to determine this size). Your figuring should include removing the selvage edges. We trimmed our fabric to a 21″ x 21″ square.
To find the true bias, fold the square at a diagonal. Press the fold in place.
Open the fabric back up so you can see the crease. The fabric should still be right side down.
Mark the left side of your square with an “A,” the right side with a “B.”
Using a see-through ruler and a rotary cutter, cut along the diagonal crease line.
Carefully place the “B” triangle to one side.
Carefully flip over the “A” triangle so it is now right side up.
Place triangle “B” on top of triangle “A” so they are right sides together and the bias cut edges form an “X” as shown in the photo below.
Place pins along the straight edge.
NOTE: The points of the triangles will extend slightly beyond the right angle at either end. This is correct.
Carefully bring your fabric to your sewing machine.
Using a straight stitch and a ¼” seam allowance, sew along the straight edge, removing the pins as you go.
Press the seam open.
All the marking is done on the wrong side of the fabric, so place your fabric back on the cutting mat right side down. Your sewn fabric should now look a parallelogram and your seam should be vertical.
With your fabric pencil and see-through ruler, mark seam lines ¼” in from the raw edges along the top and bottom of the parallelogram.
Working from left to right, mark the pre-determined width of your binding strips (our pre-determined binding width was 2″ – again, you can refer to the previously mentioned S4H tutorial to see how to figure that out).
These lines should intersect with the ¼” seam lines marked at the top and bottom.
Continue to mark in this matter across the entire parallelogram.
If you have excess width at the end that does not equal the cut width of your bias strips, mark it with a bunch of Xs so you remember to trim it off and discard it at the end of the process.
Along the top of the parallelogram, number your lines: 0, 1, 2, 3, etc. until all the lines are numbered. Yep… start with zero along the top.
Along the bottom of the parallelogram, number your lines: 1, 2, 3, etc. until all lines are numbered. Yes, along the bottom, you start with 1.
Fold the parallelogram right sides together, carefully matching the top and bottom numbers…1 to 1, 2 to 2, 3 to 3, etc. pinning in place as you go.
NOTE: You will match the “0” to the raw edge. This is your starting point where you will begin to sew in the following steps.
If you look closely, when you match up the numbered points, the drawn lines create an “X”. (We put a light behind our fabric in the photo below so you can see what we’re talking about.)
When you’re completely done pinning, your parallelogram should look like an odd shaped tube. If it’s flat, something is wrong.
Bring the fabric tube to your sewing machine.
Sew along the drawn ¼” seam line where you matched the numbers. Begin to sew at the zero – at the intersecting first seam. Stop at your last marked number. Our last marked number was 5.
NOTE: Since you will be cutting across this seam, shorten your stitch length to help keep the stitching intact. We used 1.8mm. Also, you will have to slightly manipulate the positioning of the tube as you sew this seam; be sure to handle the fabric gently so it doesn’t stretch out of shape.
Press the seam open. You will have to rotate the tube as you press the seam.
With fabric scissors, cut along the marked line, starting at zero.
Continue around and around, cutting along the drawn line, spiraling around the tube, until you get to the end.
Congratulations! You just made continuous bias binding.
Remember that extra section we marked with Xs? Now’s the time to cut it off.
At this point, you will press your binding into a single or double fold then sew it to your project.
Here is the link to the Sew4Home article.
By: Liz Johnson, Senior Editor, Sew4Home – a Janome Exclusive Studio