What Is a Splice?

Item # X-HT-300543

Have you noticed what looks like a seam in your fabric, binding or welting? Don’t worry — this is totally normal. The seam created where two pieces of material are joined together is what’s known as a splice. There are plenty of reasons a manufacturer would put a splice in any given length of material. We’re here to explain how and why.

splices in binding

From left to right: the underside of a splice in vinyl binding, the right side of a splice in vinyl binding, the underside of a splice in acrylic binding, and the right side of a splice in acrylic binding.

Splices in Fabric

Finding a splice in yards of fabric is rare, but it is more common in certain types of fabrics than others. For example, foam backed headliner from brands like Morbern® are known for having splices in the vinyl. In order to work around these splices, we recommend ordering up to 20% more material than you think you’ll need.

splice in vinyl

Splices in Bias-Cut Binding & Welting

When it comes to binding and welting, splices are inevitable. Both types of trim are made from bias-cut fabric. This means that, rather than cutting straight up the length of the fabric to create the trim, a manufacturer cuts the fabric into strips at a 45 degree angle, diagonally across the fabric. Because this results in shorter lengths of fabric, the pieces must be sewn together into a continuous strip to get the highest yard yield. Frequent splices are to be expected in any quantity of binding or welting.

splice sewn onto a project
diagram of how bias-cut strips join to create a splice

This diagram shows how fabric is cut on the bias, and how those strips are joined in a splice to create a continuous piece of fabric.