Double Z Block For a 12 inch finished Double Z block you need:       From your background cut six 3 7/8 inch squares       From color two cut two 3 7/8 inch squares       From color three eight 3 7/8 inch squares For a 6 inch finished Double Z block you need:       From your background cut six 2 3/8 inch squares       From color two cut two 2 3/8 inch squares       From color three cut eight 2 3/8 inch squares More sizes below Measure carefully, cut and sew carefully, and you won't have any problems.

You will be making all triangle squares for this block. You can see directions on how to make triangle squares (a.k.a. diagonal half squares) here. Your finished triangle squares should measure exactly 3 1/2 inches for the 12 inch finished block or 2 inches for the six inch finished block.

Repeat with all of your squares.
You need 12 like this and four like this

Now assemble in rows.

Make two rows like this, the top and bottom of the block.

And make two rows like this, the middle two rows of the block.

Now assemble your Double Z block following the diagram below

To make a 3 inch finished Double Z block cut 1 5/8 inch squares
To make a 9 inch finished Double Z block cut 3 1/8 inch squares
To make a 15 inch finished Double Z block cut 4 5/8 inch squares
To make a 18 inch finished Double Z block cut 5 3/8 inch squares