Can feel the "warmth" of it all ready.....love flannel :)

If you are using it for backing and need to seam it, use at least 1/2 inch seams.

There are definately varying weights and qualities in Fannel, some when washed, well the life is washed out of them before you start!
As already said, I would wash a couple of times just to make sure it is well shrunk and see if you are happy with the results. Usually it will shrink more widthwise than lengthwise. Some wash up tighter and are ok, because of the soft finish on Flannel it is made with fluffy shorter threads and it is this widthwise thread which wears first, therefore I would cut all my backing using the lengthwise grain of the fabric, lengthwise on my quilt. Does that make sense? There are some I would not waste my time on for a quilt with so much work involved, if it is not durable.

Gal

The new quilting flannels are wonderfull, its the pj flannels do not wear well.

Glad all are saying wash... I was going to say the same... infact I wash and dry mine twice unless I want the old quilt look and I do not wash and hope it will shrink after quilted
Connie

Now I'm not sure if I got pajama flannel or quilting flannel. It was on sale at joanns this week so I picked it up.

I have used flannel as backing many times, as well as the washing, if you are machine quilting be prepared to clean out your bobbin case very often, it is very fuzzy and there will be lots getting into your machine.

Aw, it will be warm and SOFT! I agree, just prewash in case it should shrink!

me too

I always wash my flannel, but I think everyone is right about washing and drying TWICE, since I did have one quilt where the backing obviously shrank after the first wash of the completed quilt. Didn't do it a lot of harm, but to me it looks "off".