I use 5/8" to 1" seam when I piece quilt backings. Since I usually have plenty of fabric I think a larger seam is better. I FMQ my own quilts on 9" throat machines.

I like a 1/2" seam (or slightly larger) and pressed open--do be sure to trim off the selvedge as it won't shrink the same rate of the rest of the backing. I always load it on the frame horizontally so it doesn't create sags that lead to puckers.

I use the serger to piece my backings and press the seams to the side. There are no problems as to whether the seams are vertical or horizontal, too.

Nora B, Thanks for your tip especially since you long-arm your quilts too. Nice to know that method works too.

Do you use a 3 or 4 thread stitch on the serger? I could set mine up and use it.

Mac, The quilter I use said to use a 1/2 inch seam for backings. I think it would be less likely to come apart with all the pulling and tugging that happens with quilting.

Jingle, Thanks! Oh my that 5/8 inch seam again! It was hard for me to get the 1/4 inch seam down after using the 5/8 inch seam. Good to know it will work too.

QST, Yes to the selvages off. I match and mark the two pieces first so I don't get confused before cutting.

Thanks again!

I always trim my selvedges. I use the trimmings to tie up veggies in the garden because they are so strong. I have a special hook in the pantry to hang them until needed.