Seam Al­lowance and Shrink­age

Street Rodder - - Tech -

Sewn pan­els don’t join edge-to-edge. They ac­tu­ally join a given dis­tance away from an edge. We call this dis­tance the seam al­lowance. It’s a per­sonal pref­er­ence thing but most trim­mers sew within about 3/8-1/2 inch from the edge. In other words, they use a 3/8- to 1/2-inch seam al­lowance. Glas­gow uses 3/8 inch for most ap­pli­ca­tions. So the panel shrinks by about 3/8 inch at each edge stitched.

The fol­low­ing il­lus­trates how a panel shrinks due to the seam al­lowance. The shrink­age due to seam al­lowance is crit­i­cal to ac­count for when laying out a job.

Newspapers in English

Newspapers from USA

© PressReader. All rights reserved.