The Block That Built a Thousand Quilts

 

 

There are quilt blocks that come and go, and then there are those wonderful little building blocks that seem to turn up everywhere.

The Half-Square Triangle (HST) is definitely one of those.

Simple to make, endlessly versatile and capable of creating an astonishing number of quilt designs, the humble HST has probably found its way into more quilts than we could ever count.

What Is a Half-Square Triangle?

A Half-Square Triangle, usually shortened to HST, is one of the most fundamental building blocks in patchwork and quilting.

It is simply a square made from two right-angle triangles, usually cut from contrasting fabrics and joined along the diagonal.

That sounds almost too simple to be exciting, but rotate those little squares in different directions and suddenly they can become:

• Stars
• Pinwheels
• Zigzags
• Diamonds
• Geometric designs
• Traditional quilt blocks
• Modern quilt layouts

That versatility is what makes HSTs so much fun. The same pile of blocks can produce completely different quilts simply by changing their direction.

Half-Square Triangles Keep Appearing in My Sewing Room

When I started looking back over some of the projects I have made, it was no surprise just how often Half-Square Triangles had found their way into my sewing room.

There have been cat quilts, wall hangings, table toppers, lap quilts, swap projects and plenty of those moments when I find myself thinking, “I wonder what happens if I turn this block around?”

The funny thing is that Half-Square Triangles are one of the simplest units in quilting, yet they can completely change personality depending on how they are arranged.

Maybe that is why they remain such a favourite. They are accurate enough to satisfy the part of us that enjoys everything lining up neatly, but flexible enough to let our creativity wander wherever it wants to go.

And some of the best quilts seem to happen when we simply start sewing and see where the journey takes us.

Chain Piecing Half-Square Triangles

Chain piecing and Half-Square Triangles really are a match made in heaven.

If you have ever sat at your sewing machine making HSTs one pair at a time, stopping after every seam to cut the thread, chain piecing can make the whole process much faster and more enjoyable.

Instead of stopping after each unit, simply feed the next pair beneath the presser foot. Before long, you have stitched a whole string of Half-Square Triangles in one happy sewing session.

Give an Old Rotary Blade a Second Career

Of course, eventually all those little thread chains need to be separated.

That is where an old rotary cutter blade can earn itself a second career.

Once a blade is no longer sharp enough for cutting fabric accurately, it does not necessarily have to head straight for retirement.

Ours can spend its golden years helping separate chain-pieced HSTs with the Mini Slicer.

Less waste, more quilting—and one very happy Lucy who remains convinced she is responsible for quality control.

A Half-Square Triangle Swap That Became Something Special

Years ago, when quilting swaps were all the rage, our Facebook group held a Half-Square Triangle swap.

The only real rule was simple: whatever size quilt you made, it had to be created from Half-Square Triangles.

So I did what many quilters do when inspiration suddenly decides to show up—I started turning blocks.

Left. Right. Upside down. Sideways.

No pattern. No graph paper. No carefully mapped-out plan.

Just playing.

One block became two. Two became a layout. Before long, this little quilt appeared almost as though it had designed itself.

The quilt was made for my swap partner, Natalie, who has become a dear friend over the years. It has hung on the wall in her home and, out of all the quilts I have made, this little one carries memories far bigger than its size.

It is still one of my favourite quilts—not because it is complicated or perfect, but because it reminds me of something we sometimes forget.

There is enormous joy in simply being creative, sharing and gifting.

Sometimes creativity appears when we stop trying quite so hard to organise it.

Sometimes You Just Need to Play With the Blocks

Looking back at that quilt taught me a few things about experimenting, having fun and trusting my instincts.

I think Half-Square Triangles are among the easiest quilt blocks to simply play with.

Make a few, place them on a table or design wall, then start turning them.

You may be surprised by what appears.

A Free Half-Square Triangle Quilt Pattern

If all this talk about Half-Square Triangles has you reaching for your fabric, the Circle of Friends quilt is a wonderful example of just how much can be created from this simple block.

This free Robert Kaufman pattern combines bold colour, movement and plenty of Half-Square Triangles.

Circle of Friends is a free pattern download from Robert Kaufman.

The Little Block With Endless Possibilities

Perhaps that is the real charm of the Half-Square Triangle.

It is not complicated. It does not require an enormous collection of specialised tools. And you certainly do not need to know what the finished quilt will look like before you begin.

Sometimes all you need is two pieces of fabric, a diagonal seam and the willingness to turn a few blocks around until something makes you smile.

After all, this simple little block has probably helped build thousands upon thousands of quilts—and I suspect it is nowhere near finished yet.

Half-Square Triangle FAQs

What is a Half-Square Triangle in quilting?

A Half-Square Triangle, or HST, is a square quilt unit made from two right-angle triangles joined along the diagonal. The triangles are normally made from two contrasting fabrics.

Why are Half-Square Triangles so popular?

HSTs are popular because a very simple block can be rotated and combined in countless ways to create stars, pinwheels, diamonds, zigzags and many other traditional and modern quilt designs.

Can Half-Square Triangles be chain pieced?

Yes. Chain piecing is an excellent way to sew multiple Half-Square Triangles efficiently because you can continue feeding pairs through the sewing machine without stopping to cut the thread after every unit.

What can I make with Half-Square Triangles?

Half-Square Triangles can be used for full-size quilts, lap quilts, table runners, wall hangings, cushions, bags and many other patchwork projects.

What Do You Think?

Do you enjoy sewing Half-Square Triangles? Perhaps you have a favourite HST quilt, layout or a story about a quilt that seemed to design itself as you went along.

We would love you to leave a comment for other readers. Please include your first and last name with your comment.

If you would prefer to ask Carrie a question privately, you can email her at carrie@everythingfabric.com.au.

You can also contact Mike at mike@everythingfabric.com.au.

Have a wonderful week and happy stitching,
Carrie