Example: Why I do something? or How I do something?
Why does the backing fabric need to be so much larger than the quilt top?
I have to pin the top edge and bottom edge of your backing fabric to long rollers, so I need extra at the top and the bottom. And your fabric needs to be wider on both sides, so I can clamp three clamps on each side to hold it taunt. I ask for more on the sides than most long arm quilters, because I do not want to bump into the clamps on the side when I am quilting, thus resulting in a zig or zag in my stitching lines. See the next few photos.
There is more than 6 inches of backing fabric on the sides of this quilt. If your backing fabric is larger, don't cut it off. Leave it on. It gives me more room when I am quilting the borders without bumping into the clamps. I give you all of your backing fabric back after I trim your quilt. Most customers prefer to have me trim their quilt, so it is ready to bind, but I have a few who like it left long.