Piecing a backing for a longarm
I have always pieced my backings vertically, but I've heard that longarm quilters prefer a horizontally pieced back. Is this the case, and why is that?
I have usually left 5 in. on each side, of extra backing and batting. Does this need to be more for a longarm quilter? If I have already thread basted my quilt, will a longarm quilter be able to deal with that, or will I need to unbaste it?