Quilt Block Basics

Hello Quilty Friends!

Happy Thursday to you!

Before I dive right into HSTs, I want to show off my completed Helix quilt top. Yes, I finished it! I really like the finished top, although I wish my points had turned out better. What do you think?

I didn’t have enough background left to add side strips, but that was okay, it will be fine as long as I’m careful when I sew the binding on because I don’t want to cut off the triangle points.

Lately I’ve been feeling very creative — maybe the change in the weather? I’ve been churning out new quilt designs on my EQ8 (Electric Quilt) software and I will never have enough time to make them all, I’m afraid. While I was working on all these new designs, I started thinking about the smaller units that make up quilt blocks and I thought — AHA!!! That’s a great topic for the blog!

So, welcome to a new VRQ mini-series, all about the smaller units that make up our favorite quilt blocks.

The first unit I want to talk about is the Half Square Triangle.

Half Square Triangles (HSTs)

Half Square Triangles or HSTs are one of the most common building blocks for a pieced quilt block. Sometimes you see HSTs called Triangle Squares or Half Square Triangle squares or blocks. I like to keep things simple when I write instructions and I consistently use Half Square Triangles or HSTs.

You can find HSTs in simple blocks such as:

Friendship Star (Left)
Pinwheel (Center)
Shoofly (Right)

Or in more complex blocks like:

Bear’s Paw (Left)
Mosaic #10 (Center)
Old Maid’s Puzzle (Right)

One of my most favorite things is playing around with the parts of my blocks to create new block designs when I’m designing. I like to change colors, switch lights and darks, and change the orientation of the units within a block in order to create something new and different. EQ8 makes this sew easy to do.

To show you what I mean, let’s play with the Mosaic # 17 block, which is all HSTs and gives us lots of room to play!

Let’s change the orientation of the HSTs:

Now let’s add another color in the mix:

Let’s try change the orientation, too:

Okay, okay, I’d better stop here or I’m going to lose my writing focus and create another stack of quilt designs I will never have time to make! LOL!

I think you can see how much fun it is to play with HSTs. Imagine what happens when you add other building block units with the HSTs………but that is a post for another day.

Half Square Triangle Assembly

There are many different ways to make HSTs — just check on YouTube, Pinterest, or your favorite quilting magazine.

I am going to show you my favorite method here — this is the method I use in my quilt instructions.

Layer 2 squares together, right sides together (RST).
Draw a diagonal line from 1 corner to the opposite corner.
Sew 1/4″ away from both sides of the drawn line.
Cut the HSTs apart on the drawn line. Open to make 2 HSTs.

I bet you noticed I didn’t use any dimensions for my fabric squares. That was intentional. As I’ve said many times, quilting is all about math (check out my ode to quilting and math HERE).

HSTs are no different! You can use this construction method to make any size HST. You just have to know a teeny tiny magical math secret!

To figure out how big to cut your squares, you need to add 7/8″ to your finished dimensions! Really, that’s all you need to remember. You don’t need to refer to a cutting chart, you just need to remember 7/8″. (Please note that 7/8″ may not work for all HST methods.)

Here are some examples:

I want my HST’s to finish at 3″, so I need to cut my squares 3 7/8″.

5″ finished? Cut 5 7/8″ squares.

12″ finished HSTs……….cut 12 7/8″ squares.

Easy peasy! YAY MATH! Thank you, Mrs. Hank (my high school math teacher)!