Unit 8: Binding and Finishing

Reading the Quilt's Edge: Planning and Measuring Your Binding

The quilting is done. The three layers are joined, the batting is anchored, and what remains is the narrow strip of fabric that will take every year of handling this quilt ever receives. Binding is the part that wears out first, and it is also the part everyone touches. It deserves to be planned rather than improvised.

Paul writes as a wise masterbuilder who laid a foundation and then warns the next worker to take heed how he builds on it. That is exactly the posture for this stage. Someone — you, months ago — laid a foundation of piecing and quilting. The finishing must be worthy of it, and it begins with arithmetic done before a blade touches fabric.

Square the sandwich first

Before you can measure anything, the quilt has to have honest edges. Lay it flat on a large surface. Use a long ruler and a square to trim the batting and backing even with the quilt top, checking that each corner is a true right angle. Measure the width across the top, the middle, and the bottom; if those three numbers disagree by more than about a quarter inch, the quilt is out of square and you should ease the difference out before trimming rather than binding a wobble in permanently.

Take your final measurements only after trimming. Binding calculated against pre-trim numbers always comes up short.

The perimeter, plus honest overage

For a rectangular quilt the perimeter is two times the length plus two times the width. A 60-by-80-inch quilt gives you (2 x 60) + (2 x 80) = 280 inches.

That number is not what you cut. Every diagonal join between strips consumes fabric, every mitered corner swallows a little, and the two ends must overlap to be closed. Add 12 to 24 inches. Most quilters treat 10 to 15 inches as the bare minimum and are glad of more. For our 60-by-80 quilt, plan on 300 inches and do not apologize for the leftovers.

Turning inches into yardage

Binding strips are cut selvage to selvage across the fabric width. Quilting cotton runs about 42 to 44 inches usable after the selvages come off, so call one strip 42 inches to be safe.

300 inches divided by 42 inches per strip is 7.1 strips, so cut eight. At 2 1/2 inches per strip, eight strips need 20 inches of fabric down the length of the bolt — call it 5/8 yard, and 3/4 yard if you would rather not cut it close. Buy the extra quarter yard. Fabric left over is a scrap bin; fabric run short is a dye lot you cannot match.

The mistake that costs the most

The single most common binding failure is running out three feet from the end. It is not a small annoyance. You either introduce a visible extra seam where you did not want one, or you piece in a strip from a different cut that no longer matches. Both are avoidable with two minutes of arithmetic.

The second most common failure is planning against a quilt that was never squared, so the binding fits three sides and fights the fourth.

Choosing the fabric itself

Straight-grain binding, cut across the fabric width, is correct for any quilt with straight edges, and it is what most quilts want. Save bias binding for curved or scalloped edges, where the diagonal stretch is genuinely needed.

Choose a fabric that can take abrasion. A tightly woven quilting cotton wears far better on an edge than a loose weave or a soft, lofty print. Many quilters deliberately choose a darker binding than the quilt top, because an edge that is handled daily shows soil, and dark fabric forgives it.

Write your numbers down — perimeter, overage, strip count, yardage — on a slip of paper pinned to the quilt. You will not remember them tomorrow, and rechecking a measurement is faster than recutting a binding.

Cutting Straight-Grain Strips with a Sharp Blade

Solomon's observation about the blunt iron is the plainest tool advice in Scripture. A dull edge does not stop the work; it makes you push harder to do worse work. Anyone who has forced a tired rotary blade through four layers of cotton, watched it skip threads, and then leaned into it knows the verse from the inside. Wisdom is profitable to direct — meaning the wise move is to change the blade, not to add strength.

Change the blade before you begin

A rotary blade that skips threads, that requires a second pass, or that drags rather than glides is finished. Replace it. A fresh blade cuts binding strips with one light pass and, more to the point, cuts them accurately: a skipping blade tempts you to press down and tilt the cutter, and a tilted cutter produces strips that are wider at one end than the other.

Safety belongs here and nowhere else. Close the guard every single time the cutter leaves your hand, without exception and without thinking about it — the accidents happen to experienced people setting a live blade on the table for one second. Cut away from your body. Keep your steadying hand flat on the ruler with fingers well back from the edge and your fingertips arched up, never curled over the ruler's edge. If children are in the room, the cutter goes on a high shelf when you step away, not on the mat.

Square the fabric, then cut

Press the yardage flat. Fold it selvage to selvage as it came off the bolt, and if the selvages line up but the fold ripples, slide one selvage sideways until the fold lies smooth — that tells you the grain, and the fold is your reference, not the selvage.

Lay the folded fabric on the mat with the fold toward you. Place a square ruler against the fold and butt a long ruler up against it, then make one clean cut to square the raw end. Every strip after that is measured from that squared edge.

Cutting 2 1/2 inches, eight times

Move the ruler so the 2 1/2 inch line sits exactly on the freshly cut edge. Cut. Reposition and repeat until you have your strip count.

Two habits keep the strips true. First, re-square the end every fourth or fifth strip; small errors accumulate and by strip six you are cutting a shallow V instead of a straight line. Second, cut with the ruler line on the fabric edge, not the fabric edge guessed under the ruler line — read the measurement each time rather than assuming the ruler has not crept.

What a bad strip looks like

Unfold one strip and hold it up. A good strip is one continuous width from end to end. A strip cut with a tilted cutter is visibly wedge-shaped. A strip cut across a fold that had drifted shows a shallow dogleg at each old fold line — the notorious "V" — and it will never lie flat on a quilt edge. Both are worth recutting now. A wedge or a dogleg in the binding shows up later as a ripple you cannot press out.

Do not stretch strips as you handle them. Straight-grain strips cut across the fabric width have a little give, and a strip stretched while you carry it to the machine comes back narrower and longer than you cut it.

Save the mistakes

Keep short offcuts. They are exactly the right material for practicing a mitered corner or a ladder stitch on a scrap sandwich before you commit to the real quilt, and practicing on the same fabric you will bind with tells you far more than practicing on something else.

A sharp blade, a squared edge, and honest 2 1/2 inch strips are the whole of this stage. Everything downstream — the miter, the flat corner, the invisible join — depends on strips that were true when they left the mat.

Joining Strips on the Diagonal Without Bulk

Eight separate strips have to become one continuous band before any of them touch the quilt. Paul calls charity the bond of perfectness — the thing put on above all the others, that holds the rest together. A binding is the same idea worked in cotton: the last piece added, and the one that keeps every other piece from fraying loose. It is worth joining well.

Why the seams go on the diagonal

A straight join stacks two seam allowances directly on top of each other in one place. Fold that doubled thickness in half for double-fold binding and you have four layers meeting the quilt at a single point. It makes a hard lump you can feel through the quilt, and the machine visibly hesitates as it climbs over it.

A diagonal seam spreads the same amount of fabric across about three and a half inches of binding instead of a half inch. The bulk is still there, but it is distributed thin enough that neither your hand nor the presser foot notices it.

Making the join

Lay the first strip right side up, running left to right. Lay the second strip right side down across it, running toward you, so the two form a right angle with their ends overlapping in a square. Nudge the ends so each strip extends about a quarter inch past the other.

Draw a line with a pencil or chalk corner to corner across that overlapping square. Pin on both sides of the line. Sew directly on the drawn line — not beside it — with a standard stitch length of about 2.0 mm and an 80/12 universal needle. Two strips of quilting cotton are an ordinary sewing job at this stage.

Before you press, trim the seam allowance back to 1/4 inch and cut the two little corner points off diagonally, flush with the edges of the strip. Those points are pure bulk and serve nothing. Press the seam open, not to one side. An open seam halves the thickness at that spot, and on a binding that gets folded in half anyway, halving matters.

Checking the join before you trust it

Open the joined strip flat. The seam should run at a clean 45 degrees and the two strips should form one straight band with parallel edges. If the strip has a slight bend at the join — a shallow chevron — the diagonal was drawn from the wrong pair of corners or one strip shifted while sewing. Unpick it. A bent binding strip cannot be persuaded to lie flat against a quilt edge; it will show as a wave every time.

Join all your strips into one long band before you press the lengthwise fold. Handling one 300-inch band is easier than tracking eight loose pieces, and it means you can never accidentally sew the binding on with an unjoined gap.

Pressing the lengthwise fold

Now fold the whole band in half lengthwise, wrong sides together, raw edges even, and press. This is where a good strip gets ruined.

Do not slide the iron along the length of the strip. Cotton under heat, steam, and sideways pressure stretches, and a binding stretched during pressing comes out longer and narrower than you cut it, with a fold that no longer sits at the true center. Instead, lift the iron, set it down on six or eight inches of folded strip, hold it a moment, lift it straight up, and move on. It is slower and it is the difference between binding that fits and binding that ripples.

Keep a scrap of your binding fabric and test the iron on it first, especially with any blend. Press the joined band, feed it loosely into a basket or wind it gently around a length of cardboard, and let it cool flat before you carry it to the machine. Warm cotton stretches; cool cotton holds the shape you gave it.

Choosing Binding Width: Double-Fold, Single-Fold, and Quilt Thickness

Job says his righteousness clothed him — not draped over him, not pinned on, but fitted and worn. A binding does that for a quilt. It is the only part of the finish that literally wraps around the whole thing and holds the edge closed. Choose it too narrow and it strains; choose it well and it sits as though the quilt grew it.

Double-fold, and why it is the default

Double-fold binding starts as a strip cut 2 1/2 inches wide, folded in half lengthwise with wrong sides together, and applied with the raw edges against the quilt's raw edge. It is sewn with a 1/4 inch seam allowance and then wrapped over the edge to the back.

The finished result shows roughly 3/8 inch of binding on the front and about the same on the back. More importantly, the folded edge that lies along the front of the quilt is two layers thick, and the edge that takes the wear is a fold rather than a seam. That doubled layer is why double-fold binding outlives single-fold on anything that gets washed, dragged, and slept under.

For a quilt anyone will actually use, double-fold at 2 1/2 inches is the answer nine times out of ten.

Single-fold, and where it earns its place

Single-fold binding uses a narrower strip, applied as one layer with the raw edge turned under on the back. It uses roughly half the fabric and produces a noticeably thinner, more delicate edge.

That thinness is occasionally the point. On a wall hanging that will never be washed, on a small table piece, or on a quilt made from a fabric so precious that yardage matters, single-fold gives a fine, flat edge with no bulk. It is also easier to work around a tight curve, since there is less thickness to ease.

What it will not do is survive hard use. The turned-under raw edge on the back is one layer of cotton with nothing behind it, and the visible front edge is a single thickness. On a bed quilt it wears through years before a double-fold binding would.

Matching width to thickness

Here is the rule that saves the most grief: the binding strip must be wide enough to travel over the loft of the quilt and still lie flat on the back.

A thin cotton batting with dense quilting is nearly flat, and a 2 1/4 inch strip covers it comfortably. A high-loft polyester batting, or a quilt with a flannel backing, or wool batting, is substantially thicker at the edge. The binding must go up and over that thickness before it reaches the back, and the fabric that does the climbing is fabric that no longer reaches the stitching line.

If the strip is too narrow for the loft, you will feel it immediately: the binding has to be stretched to reach around, it goes on under tension, and it dries into permanent waves and ripples along the edge — worst at the corners, where the thickness is greatest. No amount of pressing fixes it, because the strip was pulled beyond its length while being sewn.

Go up to 2 3/4 inches for a thick quilt. Better still, test.

The test that settles it

Make a scrap sandwich from your actual top fabric, actual batting, and actual backing, about eight inches square. Quilt it the way the quilt is quilted. Bind one side of it with a 12-inch length of your prepared binding.

Look at the back. If the binding covers the stitching line with a comfortable margin and lies flat without coaxing, the width is right. If it barely reaches, or reaches only when tugged, cut the real binding a quarter inch wider. Ten minutes on a scrap is cheaper than rebinding a finished quilt, and the scrap becomes your corner-practice piece afterward.

Setting Up the Machine for Three Thick Layers

Machine-attaching binding is the first time many sewers ask their machine to feed a quilt top, batting, backing, and a doubled binding strip all at once — five or six layers of cotton under one presser foot. Machines that behave perfectly on two layers of poplin can misbehave here. Nearly all of it is setup, not skill.

Paul's confidence is not in his own capacity; it is in being strengthened. It is a fair thing to remember at a machine that is about to do work you cannot do with your hands, and a fair thing to remember when the first attempt puckers and you would rather quit.

The walking foot is not optional

An ordinary presser foot holds the layers down while the feed dogs pull the bottom layer forward. The top layer, having nothing pushing it, lags. Over a few feet of quilt edge that lag becomes visible fullness in the binding, and it lands where the layers are already fighting — at the corners.

A walking foot has its own set of feed dogs on top, driven off the needle bar, that move in step with the machine's feed dogs. Top and bottom advance together. Many newer machines have an equivalent built-in dual feed system; either one solves the problem.

Seat it carefully. The walking foot's arm must sit properly over the needle clamp screw and the foot must be fully secured on the presser bar. A foot that is on crooked or only half-attached can put the needle into metal, and a broken needle on a quilt edge is a genuine hazard to your eyes and to the quilt. Turn the handwheel through one complete stitch by hand before you touch the pedal.

Needle and stitch length

Use a 90/14 needle for the binding pass. It is stout enough to go through the stack without deflecting. A topstitch or microtex needle in 80/12 is a good alternative if you like a finer hole; both have the shaft strength for the job. A worn universal 80/12 is what skips stitches on quilt edges.

Set the stitch length between 2.0 and 3.0 mm. Thin, densely quilted pieces do well at 2.0 to 2.5 mm. Thick or lofty quilts need the longer end — 2.75 to 3.0 mm — because a short stitch on a thick stack packs the fabric up ahead of the foot and creates fullness the walking foot then has to fight.

The quarter inch, held honestly

Binding is sewn with a 1/4 inch seam allowance, and it must be the same quarter inch for the entire perimeter. If it wanders wider, the binding will not reach the stitching line on the back. If it wanders narrower, you get too much binding for the edge and it ripples.

Use a quarter-inch foot if your walking foot has a guide, or lay a strip of painter's tape on the machine bed exactly a quarter inch to the right of the needle and run the raw edges along it. Watch the tape, not the needle. Sewers who watch the needle drift; sewers who watch a guide do not.

What a bad pass looks like

Stop and diagnose rather than pushing on. Puckering on the underside means the layers are feeding unevenly — check that the walking foot is engaged. Skipped stitches mean the needle is wrong or dull. A binding that suddenly seems too long for the edge means you have been stretching it as you feed; let the strip lie loose and let the machine take it rather than pulling from in front.

Never push or pull the quilt through. Support its weight on a table or your lap so the bulk hanging off the machine is not dragging the edge sideways. A heavy quilt pulling on the seam you are sewing is a distortion no foot can correct.

Attaching the Binding to the Quilt Front

Exodus calls the tabernacle textiles cloths of service — made carefully, of good material, to be used. That is the right name for a quilt too. The binding pass is the moment the quilt stops being a project and starts being a thing that serves someone, and it is worth doing at an unhurried pace with the machine set up as it should be.

Where to start and why it matters

Never start a binding at a corner. Begin along a side, roughly a third of the way between one corner and the next, and on the longest side if the quilt has one. Corners already carry a miter and a great deal of bulk; adding the starting overlap there guarantees a lump.

Leave a tail of unstitched binding at least 10 to 12 inches long before your first stitch. That tail is what you will need later to join the two ends invisibly. A short tail is the reason many quilts have a visible seam at the join.

Laying the binding on

Work with the quilt front up. Place the folded binding on the quilt with its two raw edges even with the raw edge of the trimmed quilt sandwich. The fold points in toward the middle of the quilt.

Do not pin the whole side. Pinning the binding down along its full length locks in whatever length you happened to lay out, and if you laid it slightly short it will pull. Pin every six or eight inches, or use clips, and let the strip find its own length between them.

Sewing

Backstitch two or three stitches to anchor, then sew forward at a steady speed with the raw edges riding your quarter-inch guide. Keep both hands flat on the quilt, one ahead of the foot and one behind, guiding rather than pulling.

The binding should lie relaxed against the quilt edge as it enters the foot. If you find yourself tugging it taut to make it reach, stop: the binding is going on stretched, and a stretched binding relaxes after sewing into ripples along the edge. If instead the binding is visibly fuller than the quilt edge, ease that fullness out over several inches rather than letting it pile up in one spot.

The last few inches of each side

Slow down as you approach a corner. You need to stop stitching exactly 1/4 inch from the corner — the same quarter inch you have been sewing — and that is easier to hit at half speed. Mark it if you like: a pin stuck 1/4 inch in from the corner, or a chalk dot, is not a beginner's crutch. Many experienced quilters mark all four.

Backstitch there, cut the threads, and take the quilt out of the machine. Handling the corner comes next and it is done off the machine, with your fingers.

Common trouble

If the binding waves along a finished side, one of three things happened: it was stretched while feeding, the seam allowance wandered wider than a quarter inch, or the strip itself was distorted during pressing. Check the seam width first, since it is the easiest to see — measure from stitching to raw edge in several places.

If the quilt edge itself has stretched — a common result of dragging a heavy quilt across the machine bed — the binding will not be at fault and will not fix it. Ease the quilt edge to the binding, holding the binding at its true length and distributing the quilt's excess under it.

If the machine begins to labor as you cross a seam in the binding, slow down and let it climb; do not help it with a push. A hand-fed stitch over a bulky join is nearly always crooked.

Sew all four sides, mitering each corner as you reach it, and stop with a good 12-inch tail unsewn where you began.

Turning a Mitered Corner That Lies Flat

The Israelites were told to put fringes on the four quarters of the garment that covered them — the corners were where the work of remembering was placed. A quilt's four corners carry the same disproportionate weight. They are the first thing a critical eye lands on, the first place the binding fails under use, and the one part of the binding that is genuinely a technique rather than a straight seam.

Stop in the right place

You cannot miter a corner you have sewn past. Stitch down the side and stop exactly 1/4 inch from the corner's raw edge, with the needle down, then backstitch two or three stitches, clip the threads, and lift the quilt out.

That quarter inch is the whole geometry. Stop short of it and the corner will have a slack pucker on the front. Sew past it and the corner will be tight and blunt, refusing to open into a square.

The two folds

Take the loose binding strip in your fingers. Fold it straight up, away from you, so that it turns a 45-degree angle at the point where you stopped stitching and the strip now runs off the quilt at a right angle to the seam you just sewed. Press this fold with a fingernail. You should see a clean diagonal crease running to the corner.

Now fold the strip back down toward you, along the next edge of the quilt. The top fold you just made stays trapped underneath. The new fold across the top should lie exactly even with the raw edge of the side you have just finished, and the strip's raw edges should now be even with the raw edge of the next side.

That is the entire miter. Two folds, one up at 45 degrees, one straight back down.

Sewing on

Put the quilt back under the foot at the very top of the new edge, right at the folded edge, not a quarter inch down from it. Backstitch to anchor, and sew down the new side at your quarter inch. Repeat at each of the four corners.

Judging the result

Take the quilt out and open the corner. A correct miter shows a clean 45-degree line of folded fabric running from the corner point inward, and the corner squares up crisply when you push it out with a blunt point — a chopstick or a knitting needle, not scissors.

A corner that will not open square, that has a rounded blunt nose, is nearly always a corner where you stitched past the quarter inch. A corner with a soft pucker on the front is one where you stopped too soon. Both are worth unpicking two inches and redoing; a bad corner does not improve when the binding goes to the back.

Reducing the bulk before you hand finish

The corner is where the most layers meet: quilt, batting, backing, and four thicknesses of binding folded together. Left alone, that bulk fights you when you turn the binding to the back and it hardens into a stiff, distorted corner.

Before hand stitching the back, trim the batting and backing diagonally across the very corner point, taking off a small triangle, and clip into the binding's seam allowance near the corner without cutting the stitching. It relieves just enough thickness for the miter to fold cleanly on the back as well as the front.

When you fold the binding to the back, the reverse miter forms on its own if you let it. Push the corner out square, coax the diagonal fold into place with your fingers, and stitch the two folded edges of the miter closed with three or four small stitches as you reach it. Those few stitches are what keeps the corner from opening after the first wash.

Closing the Loop: Joining the Two Binding Ends

You have come all the way around the quilt, mitered four corners, and arrived back where you started with two loose tails and a gap of unsewn edge between them. This is the step at which tired sewers cut corners, and it is the step that shows. Paul's counsel not to grow weary in well doing lands squarely here: the reaping is a quilt whose binding has no visible join anywhere on it, and it costs fifteen careful minutes at the end of a long day.

Why not just overlap and sew

The quick method — fold one tail under, tuck the other inside, and topstitch across — leaves four layers of binding stacked in one short span and a straight seam sitting crosswise on the edge. You can feel it and, on a solid fabric, you can see it. Since every other join in this binding was made on the diagonal for exactly that reason, the last one deserves the same treatment.

Measuring the overlap

Lay both tails flat along the unsewn gap so they overlap in the middle. Smooth them without stretching.

Trim the tails so that they overlap each other by exactly the cut width of your binding strip. If you cut 2 1/2 inch strips, the overlap is 2 1/2 inches. If you cut 2 1/4, it is 2 1/4. That figure is not arbitrary — it is the amount of fabric a 45-degree seam consumes across a strip of that width, and getting it right is the difference between a binding that lies flat and one that is either too tight or has a small bubble.

Cut both tails square, straight across, at the marked points.

The join itself

Open both tails out flat, unfolded, so you are working with full 2 1/2 inch width. This is the part that feels wrong and is correct.

Bring the two open ends together at right angles, right sides facing, in the same crossed arrangement you used for joining strips earlier. Pin. Draw a diagonal line corner to corner across the overlapping square and sew on the line.

Before trimming, check your work: unfold the join and lay the binding back down along the quilt edge. It should lie flat, with no slack and no strain, and the gap should close exactly. If it is loose, the overlap was cut too long; if it pulls, too short. Correcting it now costs one seam. Correcting it after trimming costs a new tail.

When it fits, trim the seam allowance to 1/4 inch, clip the corner points, and press the seam open. Refold the binding along its lengthwise crease, lay it in the gap, and sew the remaining few inches with the same quarter-inch seam, backstitching where you meet the existing stitching at both ends.

The result and the failures

Run your fingers along that stretch. A good join is indistinguishable by touch from the rest of the binding, and the diagonal seam is only findable if you go looking for it.

If you find a small bubble of loose binding, the overlap was cut generously. If the binding pulls the quilt edge in slightly, it was cut short. If the seam is bulky, you skipped trimming the corner points or pressed the seam to one side instead of open.

One more caution: it is easy, in the crossed-right-angle position, to sew the diagonal in the wrong direction and end up with the binding twisted into a loop with a half turn in it. Always unfold and check the fit against the quilt before you cut anything away. That one check catches every version of this mistake.

Hand-Finishing the Back: Ladder Stitch and Whip Stitch

The woman in Matthew's account reached for the hem of the Lord's garment — the border, the finished edge, the part within reach of someone kneeling. Scripture keeps returning to the edges of garments, and it is a fitting thought for the hours of quiet hand work that finish a quilt. This is the last stitching the quilt will receive, and it is done slowly, by hand, in a chair.

Setting up

Fold the binding over the raw edge to the back so the folded edge covers the machine stitching line by a thread or two. Hold it with clips rather than pins — pins in a lap quilt find your fingers for hours afterward.

Use a between needle in size 7 or 9. These are short and comparatively stout; the short shaft gives you control going through several layers, and it does not bend and snap the way a long, fine needle does when it meets a seam allowance.

Wear a thimble on whichever finger pushes the needle. Several hundred pushes through a quilt edge will blister an unprotected finger, and a sore finger makes for hurried, sloppy stitching by the second hour.

Cut your thread no longer than 18 inches. Longer thread tangles, knots on itself, and abrades from being dragged repeatedly through the layers. Use a single strand, never doubled — doubled thread knots constantly and shows as clumsy, thick stitches on the back.

Ladder stitch

Ladder stitch is the invisible one. Bring the needle up through the binding fold, hiding the knot inside the fold. Then slip the needle into the quilt backing directly opposite where the thread emerged, travel about an eighth of an inch inside the backing fabric, and come out. Cross straight back into the fold of the binding at that same point, travel an eighth of an inch inside the fold, and come out again.

The thread makes a series of short rungs crossing an invisible gap — hence the name. When you gently draw it up, every rung disappears into the layers and there is nothing on the surface to see. Do not pull hard; snug is enough. Pulling tight puckers the edge.

Whip stitch

Whip stitch is faster and visible. Bring the needle out of the binding fold, angle it into the backing just below the fold, and come back up through the fold a short distance along. The stitches sit as small diagonal marks on the surface.

There is nothing wrong with it. It is strong, it is quick, and on a quilt with busy backing fabric or a matched thread, it is barely noticeable. Choose ladder stitch when you want the finish invisible and have the hours; choose whip stitch on a utility quilt or when the recipient needs it by Saturday.

Knots and security

A single knot at the start and end of a 300-inch edge is a bad bet: one broken thread unzips a long span. Place a small hidden knot inside the binding fold roughly every 6 inches, or about every 10 to 12 stitches. It is called a lingerie knot or knicker knot, and it is simply a small loop caught around the last stitch and drawn down tight against the fabric, then buried in the fold.

If a thread breaks later, the failure stops at the nearest knot instead of traveling.

Corners and common trouble

Work up to each mitered corner, stitch the diagonal fold of the miter closed with three or four stitches, then carry on down the next side.

Stitches showing on the front mean the needle went too deep — take only the backing layer, never through to the top. A rippled edge after hand finishing means the thread was pulled too tight; unpick and redo with a lighter hand. Binding that will not reach the stitching line means the strip was cut too narrow for the loft, and no amount of stitching will rescue it.

Continuous Bias Binding for Curved and Scalloped Edges

Exodus records a girdle of fine twined linen in blue and purple and scarlet, made of needlework. A girdle is a long narrow band that has to follow the shape of a body, and the makers of the tabernacle textiles were doing, in their way, what you are about to do: making a strip that bends without fighting.

Straight-grain binding is right for straight edges. A curve is a different problem, and it takes a different strip.

Why bias

Woven fabric has almost no give along the lengthwise or crosswise grain, but a great deal of give at 45 degrees to both. A strip cut on that diagonal will stretch along its length and narrow slightly as it does, which is precisely what a binding must do to travel around an outside curve without buckling, and to compress around an inside curve without a fistful of pleats.

Try it once on a scallop with straight-grain binding and you will not need convincing again.

Building the tube

Cutting individual bias strips and joining them works, but every strip has two ends and every join is bulk. The continuous method makes one long strip from a single square with only two seams total.

Start with a square of fabric. Cut it once, corner to corner, into two triangles. Take one triangle and flip it over onto the other so the two cut bias edges are together, right sides facing, and sew that seam at 1/4 inch. Press it open. You now have a parallelogram.

On the wrong side, draw a set of parallel lines running the length of the parallelogram, spaced at your cutting width. Draw them all before you go further, and check that the spacing is even end to end.

Now bring the two remaining straight edges together to form a tube — but offset them by exactly one strip width, so that the first drawn line on one edge meets the second drawn line on the other. The edges will not line up flush, and they are not supposed to. Pin carefully, matching line to line all the way along, and sew at 1/4 inch. Press the seam open.

Cutting the spiral

You are holding a tube with a spiral drawn on it. Cut along the drawn line, starting at the little tail that sticks out from the offset, and keep cutting. The tube unwinds into one continuous bias strip.

Work with sharp small scissors or slide a cutting mat inside the tube for a rotary cutter. Cut on the line, not near it — a wandering cut here produces a strip that changes width, and there is no fixing it afterward.

Widths

For double-fold bias, cut the width four times the finished visible width you want. A cutting width of 1 1/2 inches yields a finished bias tape of about 3/8 inch. If you want a wider finish on a thick quilt, scale the cutting width up by the same rule, and always test on a scrap of the actual curve before committing a whole quilt's worth.

Handling it

Bias stretches — that is the point, and also the danger. Press the fold by lifting and setting the iron, never dragging. Carry the strip supported rather than dangling. When sewing it on, let the machine feed it; if you pull, the strip lengthens permanently and the finished edge will ripple.

On an outside curve, ease the binding around gently without stretching it. On an inside curve, such as the notch between two scallops, the binding must compress; guide it and stop with the needle down to pivot rather than trying to sweep through. Take the curves at slow speed and expect to lift the foot often.