I feel like everyone develops their own groove for piecing equilateral triangles. There’s certainly more than one way to approach it so what I’ve put together for you today is a set of pictures showing how I do it with some tips for making triangles less stressful.
After I’ve determined my layout for my project, I break sections down into diagonal rows. This feels more natural to me over piecing in a horizontal or vertical. Today I don’t really have a set layout, so I’m grabbing triangles and joining in a diagonal.
Start near the middle of your row with two triangles that sit on top of each other:
Place the triangles right-side together and join with a 1/4″ seam:
Press seams open. Open seams is the most important part of my process.
Next, I add a triangle that goes to the upper right of the first triangle that I started with:
See that corner point of the purple triangle above? I use that to line up my next piece. So I’ll flip my blue triangle right-sides together with the orange. The next picture shows the back and I’ve pointed out the part I use to align.
By pressing the seams open, I’ve given myself a line of the 1/4″ seam allowance that was used for piecing all the other triangles. So using those extra corners (that normally would be cut off) ensures that I’m keeping points intact later.
In the next picture, the blue triangle has been sewn on with a 1/4″ seam and seams have been pressed open again. The next triangle to add is the one that is lower left from that first pair. The arrow in the next picture shows the point that I use to line up my next triangle (it’s from the open seam of the orange one):
I continue to piece all my triangles following the steps above, adding triangles to the top and bottom until my diagonal is long enough. Since I’m piecing on the diagonal, rows will shorten out as I move away from the middle.
The last thing I use to align is when I’m joining those rows together. I pay the most attention to the triangle points that are already set from previous joins. These are the points that you *don’t* want to lose in your quilt. So when I’m setting my rows right-sides together before sewing, I make sure that these points are touching along the row (the arrow below shows the point I’m paying attention to):
Those are some of the tips that I have for piecing Equilateral Triangles.
I know that this method may seem unclear to some of y’all so please feel free to leave me any questions that you might have!