Quilting Day

What the day is

Quilting Day is observed on March 21. The history of quilts as documents sits on the Visit Your Local Quilt Shop entry in January; this one is about how they are actually constructed.

Origin and background

Piecing is applied geometry with an unforgiving tolerance. Blocks are built from shapes cut and sewn to a seam allowance that is conventionally a quarter of an inch, and the reason that measurement is treated so seriously is cumulative error. A seam sewn a sixteenth of an inch too wide seems negligible, but a row of twelve such seams shifts the block by three quarters of an inch, and adjacent blocks then refuse to meet. Quilters talk about a scant quarter inch, slightly under the nominal measure, precisely because the fold of the fabric itself consumes a fraction.

The grain of the fabric is the other constraint. Woven cotton is stable along the threads and stretchy on the diagonal, so any piece cut with a bias edge, such as the long side of a half-square triangle, will distort if handled carelessly. Patterns are designed around keeping stretchy edges on the inside of a block where possible.

Pressing rather than ironing matters for the same reason. Sliding a hot iron across pieced work drags the bias out of shape, so quilters lift and lower the iron instead.

The quilting itself, the stitching through all three layers, is structural as well as decorative. Batting must be held at intervals specified by its manufacturer or it shifts and clumps in washing, which is why a densely quilted piece survives use and a sparsely quilted one does not.

The rotary cutter, introduced in the late 1970s, transformed the craft by making accurate strip cutting fast, and most modern patterns assume it.

How to take part

• Test your quarter-inch seam on scraps and measure the result before starting.
• Press by lifting the iron rather than sliding it.
• Keep bias edges inside the block wherever the pattern allows.
• Check the batting's maximum quilting distance before deciding your design.
• Start with a simple block repeated, which teaches accuracy faster than a complex one.