If you are making the block using a rotary cutter, cut 3 squares of each fabric at 3 3/8" and then cut them them on the diagonal to make 6 half square triangles of each.
Basically you are going to sew the blocks in three combinations - dark/medium, dark/light, medium/light.
Back to our sample block, press each square toward the darker fabric.
One way to sew the block together is to flip the middle vertical row over onto the first row and chain stitch them together. Then open it up and flip the 3rd vertical row onto the middle row and chain stitch that.
Finally sew the three rows together. You already have them joined in the correct position. Be sure to butt the seams going in opposite directions to lock in a perfect point. I use one pin in each seam.
Press all in the same direction, and voila - a simple and attractive block to add to our sampler.
Renovation Update: My sewing room is coming to order. I still have to find places for some items. We have only the rest of today and tomorrow morning to get the guest room ready for my Mom's visit. Yikes!
Happy Sewing ♥