The sashing ends up being 1 inch wide and made up of two blocks sewn togather and then top stitched. The blocks are strips sewn onto the batting and backing. It really is simple to do but be sure and use a zipper foot when you connect the blocks so you can get as close as possible to the block and batting. This is the only seam that holds the quilt togather.
The pattern I used has little strips in the middle of longer strips but a simpler pattern would be to use just strips without the little pieces in the middle. The strips are cut 1 3/4 inchs wide.