Sampler Quilt Project – Tutorial 2 – Half Square Triangles (HSTs) – Blocks 4, 5 & 6

So glad you’re here for tutorial 2 of our Sampler Quilt project. This month we’ll be working on blocks 4, 5 and 6. If you’ve missed out on any of our earlier posts in this Quilt-a-Long, here are links to them:

Key:

  • All seam allowances are ¼”
  • RST = Right Sides Together
  • HST = Half Square Triangle
  • All Finished blocks are 8”
  • The finished quilt size is 36″x46″

Colours

Here’s a reminder of the fabric colours I’m using throughout this quilt. They correspond to the sampler quilt kit and all photos in the promotion material. You can change these colours to suit your own preference. Just make a note of your colours and label them A – G.

Let’s Get Started

In this tutorial we are going to be learning all about the Half Square Triangle (HST) which is one of the easiest and most used blocks in quilting.

Below is a simple step-by-step instructional diagram on how to construct HSTs. We are going to be using this method throughout the sampler quilt.

How To Create Half Square Triangles (HSTs)

  • Layer your two fabric squares with right sides together, with the lighter fabric on top. Align the edges carefully.
  • Using a ruler and pencil, draw a diagonal line on the wrong side. This line will not show up on the finished quilt block.
  • Sew a seam ¼” either side of your drawn diagonal line. The dashed line in the diagramabove shows where you should sew. You can either draw a line to mark where to sew or use a ¼” machine foot on your sewing machine.
  • Using a rotary cutter and ruler or scissors, cut along the marked diagonal line.
  • You will now have 2 half square triangle units. Open out each of the units and press them flat. Trim off the small ‘tails’ of fabric.

Block 4

Half square triangle block in light blue and dark blue

Colour B – cut (2) 5″ x 5″ squares
Colour D – cut (2) 5″ x 5″ squares

Follow the HST construction method to create 4 blocks by placing:
Colour B and Colour D, RST

Lay out your pieces as shown in the diagram below.

Put the top 2 squares with RST and sew along the centre vertical seam. Press seams to the right.

Repeat for the bottom 2 squares and press seams to the left.

Place your top row and bottom row with RST and sew along the centre horizontal seam.

Open out and press flat your first block is now complete.

Block 5

Half square triangle block in grey

Colour F – cut (2) 5″ x 5″ squares
Colour A – cut (1) 5″ x 5″ squares
Colour G – cut (1) 5″ x 5″ squares

Follow the HST construction method to create 4 blocks by placing:
Col.F and Col.A RST
Col.F and Col.G RST.

Lay out your pieces as shown in the diagram below.

Put the top 2 squares with RST and sew along the centre vertical seam. Press seams to the right.

Repeat for the bottom 2 squares, press seams to the left.

Place your top row and bottom row with RST and sew along the centre horizontal seam.

Open out and press flat your second block is now complete.

Block 6

Half square triangle block in blue and grey

Colour E – cut (2) 3″ x 3″ squares
Colour C – cut (3) 3″ x 3″ squares
Colour G – cut (8) 3″ x 3″ squares
Colour F – cut (3) 3″ x 3″ squares

Follow the HST construction method to create 16 blocks by placing:
Colour C and Colour G, RST
Colour E and Colour G, RST
Colour F and Colour G, RST

Lay out your pieces as shown in the diagram below.

Start with the first row working form left to right, sewing each block with RST. Press seams to the right.

Repeat for the second row and press seams to the left.

Repeat for the third row and press seams to the right.

Repeat for the fourth row and press seams to the left.

Tip: Pressing the seam allowance in the different directions creates less bulk when you come to sew the rows together.

Place your 1st row and 2nd row with RST and sew along the centre horizontal seam.

Place this piece to your 3rd row with RST and sew along the centre horizontal seam.

Finally place this piece to your 4th row with RST and sew along the centre horizontal seam.

Open out and press flat. Your third block is now complete.

What’s Next?

Well done for reaching this far in the project, you have already completed half of the blocks in this quilt!

Next, we will be working on a further 2 blocks, which will expand your quilting skills even more.

Expect to see this tutorial on our website in the first week of December.

Happy Sewing,

Cindy

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