First of all there are several types of quilt sashings. The basics for creating the sashing is the same for each style, the difference is how many sashings, how complex the piecing is, and how many sashing units and cornerstones?
Sashing: The fabric that separates blocks in a setting, framing them and making the quilt larger. There are two basic kinds of sashing -- continuous and sashing with sashing posts (cornerstones)
Cornerstones: Generally a small square piece of fabric used at the intersection of blocks or sashing sections of a quilt top .
More Quilting Terms and Definitions.
Quilt sashing can be continuous, no cornerstones, with no cornerstones, or just a LOOOONNNNG strip of fabric sewn as a row between the quilt blocks. The image to the right shows the problem most quilters have with just using a long strip of fabric. There are several problems with this. Like lining up those pesky blocks.
Cornerstones serve several purposes:
To make sashing and cornerstones you will need fabric, thread, measuring tools, cutting tools, sewing machine, and iron.
All the usual sewing/quilting tools.
What size are the quilt blocks? If the unfinished size of the block is 12.5" (unfinished), then you just need the sashings to be 12.5"
Easy! The WIDTH of the sashing can vary. A very popular size for 12" (finished) blocks is a 2 inch (finished) sashing.
Good to Note: If the sashings are 2.5" (unfinished), then the cornerstones would be 2.5 squares (unfinished).
Tools:
Sewing sashing between your quilt blocks is one way to add another design element to the quilt's layout. It has these uses:
It's easy to sew sashing to a quilt, especially straight-set layouts. Since they don't require triangles or strips with angled edges as on-point settings do.
Sashings work the same whether you are making a straight set quilt or a diagonal set quilt. The size of one edge of the block.