I’ve changed the colours slightly to make my own version of the Porto Rico quilt block. Red, white and blue blocks are always very cheerful looking and I think that this one is a particularly happy looking block. The finished size is 16″ square.

### Cutting requirements for the porto rico quilt block

2.1/2″ squares: two white, eight red, ten blue

4.7/8″ squares: three blue, three red, four white

5.1/4″ squares: one white

### Make the four patch units

If I was making several blocks I would use strip piecing for the four patch units, but as I’m only making one block I have just used individual squares.

Place the 2.1/2″ squares in fours with the blue squares diagonally opposite each other. Sew the squares together in pairs and then sew the pairs to each other. You need to make five units in blue/red and one unit in blue/white.

### Make the central section

Cut the 5.1/4″ white square along both diagonals to make four triangles. Place one triangle on each edge of the blue/white four patch unit. Sew the triangles to the top and bottom. Press these open and then sew the two side triangles in place.

Cut one blue and one red 4.7/8″ square along one diagonal to make two triangles from each square.

Lay these triangles on the edges of the central section. With the blue small squares running vertically, lay the two blue triangles on the sides and the two red triangles on the top and bottom.

As before, sew the top and bottom triangles on first, press open and then sew the side (blue) triangles in place. This completes the central section of the Porto Rico quilt block.

In this section and in the previous stage where you added white triangles, you need to trim the middle of the edges where the triangle tips stick out.

### Make half square triangle units

For the outer frame you need half square triangle units. Use the remaining 4.7/8″ squares. Place a white square with either a red or a blue square, right sides together. Mark a line along the diagonal and sew a 1/4″ seam either side of the marked line. Cut along the line to produce two half square triangle units. These are now 4.1/2″ squares. Press the seam allowances towards the red or blue fabric and trim the two corners where fabric sticks out.

### Complete the layout for the Porto Rico quilt block

Place a red/white and a blue/white half square triangle on each edge of the central square. Note that I have placed the central section so that the two small blue squares run from bottom left to top right.

On the top the half square triangles are placed red then blue. On the right hand side they are placed blue then red. Basically each red triangle on the outer frame should lie against a blue triangle in the inner section.

Add the remaining four patch units to form the corners of the block. place these so that the blue squares always run from bottom left to top right.

Sew the patchwork pieces together across the top row and the bottom row. For the middle section you will need to sew the half square triangles to each other first and then sew the pieces across the row.

You should end up with three rows. Sew the rows to each other to complete the Porto Rico quilt block.

For the basic quilt suggestion I have used nine blocks sewn together in three rows of three.

This makes one of those quilts that look a lot more complicated than they really are.

I tried using an alternate block but didn’t feel that this was terribly interesting.

I know that it doesn’t look much different, but for my third effort I tried rotating alternate blocks. For some reason that I can’t explain, this one seemed a brighter quilt and I liked it best of the three designs.

Here’s the video:

Thanks for visiting my blog.

I hope to see you again soon.

Rose