As I noted before, the limiting factor on judging how big of a quilt can be bound with this technique, depends on your ability to lay it out after the binding is done and smooth and pin it for machine quilting because the layers must be smoothed out. I've done 60" square throws a couple times but haven't tried anything bigger.
|This wall quilt features curved piecing and the red strips around the outside were sewn on with curved piecing. The strips were then treated like any other mock binding in the finishing of the binding.|
When figuring how much fabric you'll need, this is what I would need to take into consideration.
The backing needs to be a little larger than the top on all sides with the strips sewn on.
Add 1" to allow for a 1/2" seam in the backing.
Figure 4 strips, cut 1" by the length of the sides PLUS at least 2-3".
I always figure extra fabric and cut the backing a little larger than the minimal size and usually cut the binding strips 3" longer than the sides of the quilt. The binding strips can be pieced.
Be sure to use starch on the strips BEFORE cutting them out and then use steam in your iron when pressing them.
For best results, do a practice mock binding project to get the process down before attempting to bind a quilt top. Start small before going on to larger projects.