What is "shingling," also referred to as "creep" or "feathering," and why should you care? Understanding the concept behind these terms will improve the quality of your saddle-stitched books. Shingling, or creep, refers to the fact that the trim margin of inner pages of inner signatures of saddle-stitched books are actually narrower than pages in outer signatures.
Shingling is one means of compensating for creep. Creep is also known as binder's creep, push out, and thrust, and is commonly an issue only in publications that are bound by saddle-stitching. Please note that compensating for binders creep is not necessary when designing perfect bound (soft cover) books due to the minimal amount of creep each signature incurs.