Quilt block · Nine-patch · Advanced
Arbor Window quilt block
A six-by-six of half-square triangle units round four plain center squares: a ring of light triangles inside a sawtooth border of dark and medium.
What to cut for one block
A 6″ finished block measures 6½″ before it’s sewn into a quilt. Each fabric’s yardage is the least that cuts its strips across the width of fabric, with a strip to spare for straightening.
Background · Snow in the picture
4 squares and 12 triangles
- A6 squares 1⅞″cut once on the diagonal
- B4 squares 1½″
Dark · Navy in the picture
20 triangles
- A10 squares 1⅞″cut once on the diagonal
Medium · Denim in the picture
20 triangles
- A10 squares 1⅞″cut once on the diagonal
Light · Powder Blue in the picture
12 triangles
- A6 squares 1⅞″cut once on the diagonal
Worked out by @quarterinch/cutting · ¼″ seams included · strips cut across 42″ of usable width · the letters are the pieces the sewing steps name
A 9″ finished block measures 9½″ before it’s sewn into a quilt. Each fabric’s yardage is the least that cuts its strips across the width of fabric, with a strip to spare for straightening.
Background · Snow in the picture
4 squares and 12 triangles
- A6 squares 2⅜″cut once on the diagonal
- B4 squares 2″
Dark · Navy in the picture
20 triangles
- A10 squares 2⅜″cut once on the diagonal
Medium · Denim in the picture
20 triangles
- A10 squares 2⅜″cut once on the diagonal
Light · Powder Blue in the picture
12 triangles
- A6 squares 2⅜″cut once on the diagonal
Worked out by @quarterinch/cutting · ¼″ seams included · strips cut across 42″ of usable width · the letters are the pieces the sewing steps name
A 12″ finished block measures 12½″ before it’s sewn into a quilt. Each fabric’s yardage is the least that cuts its strips across the width of fabric, with a strip to spare for straightening.
Background · Snow in the picture
4 squares and 12 triangles
- A6 squares 2⅞″cut once on the diagonal
- B4 squares 2½″
Dark · Navy in the picture
20 triangles
- A10 squares 2⅞″cut once on the diagonal
Medium · Denim in the picture
20 triangles
- A10 squares 2⅞″cut once on the diagonal
Light · Powder Blue in the picture
12 triangles
- A6 squares 2⅞″cut once on the diagonal
Worked out by @quarterinch/cutting · ¼″ seams included · strips cut across 42″ of usable width · the letters are the pieces the sewing steps name
How it’s sewn
For the 6″ block. Choose another size above and these steps follow it.
- Make 20 half-square triangle units
Sew a Dark A triangle to a Medium A triangle along their long edges. Press toward the Dark. Each measures 1½″ (1″ finished).
- Make 12 half-square triangle units
Sew a Light A triangle to a Background A triangle along their long edges. Press toward the Light. Each measures 1½″ (1″ finished).
- Sew the units and pieces into 6 rows
Lay out the units and pieces as in the picture and sew them into 6 rows. Press the seams in row 1 to the left, row 2 to the right, and so on, so they nest when the rows are joined.
- Join the rows
Join the 6 rows, matching and nesting the seams where they meet. Press the long seams open or to one side. The block measures 6½″ (6″ finished).
For the 9″ block. Choose another size above and these steps follow it.
- Make 20 half-square triangle units
Sew a Dark A triangle to a Medium A triangle along their long edges. Press toward the Dark. Each measures 2″ (1½″ finished).
- Make 12 half-square triangle units
Sew a Light A triangle to a Background A triangle along their long edges. Press toward the Light. Each measures 2″ (1½″ finished).
- Sew the units and pieces into 6 rows
Lay out the units and pieces as in the picture and sew them into 6 rows. Press the seams in row 1 to the left, row 2 to the right, and so on, so they nest when the rows are joined.
- Join the rows
Join the 6 rows, matching and nesting the seams where they meet. Press the long seams open or to one side. The block measures 9½″ (9″ finished).
For the 12″ block. Choose another size above and these steps follow it.
- Make 20 half-square triangle units
Sew a Dark A triangle to a Medium A triangle along their long edges. Press toward the Dark. Each measures 2½″ (2″ finished).
- Make 12 half-square triangle units
Sew a Light A triangle to a Background A triangle along their long edges. Press toward the Light. Each measures 2½″ (2″ finished).
- Sew the units and pieces into 6 rows
Lay out the units and pieces as in the picture and sew them into 6 rows. Press the seams in row 1 to the left, row 2 to the right, and so on, so they nest when the rows are joined.
- Join the rows
Join the 6 rows, matching and nesting the seams where they meet. Press the long seams open or to one side. The block measures 12½″ (12″ finished).
Blocks like it
More like this: Nine-patch quilt blocks · all quilt blocks
Questions
Short answers.
Something else? A real person replies.
hello@quarterinch.app
What size should I make it?
Its 6 × 6 grid lands on the ⅛″ marks at 6″, 9″ and 12″, so every piece measures with a ruler at all three. It also cuts cleanly at 15″ and 18″. In Quarter Inch you can make it any size, and it says when a cut falls between the lines.
Can I paper piece it?
Yes. It splits into 6 sections (A, B, C, D, E and F), each sewn on its own paper in order and then joined with straight seams. In Quarter Inch, the Foundations tab prints its papers at true size (with Quilter).
Is it a good block for a beginner?
It’s an advanced block: 68 pieces in 2 different shapes and 12 points to match. Practise the hard seams on scraps first. We work the level out from the block’s own geometry, never by eye.