Any suggestions for the best way to join batting pieces so that they are wide enough to fit my quilt. The quilt is a 58" square and my batting is only 48" wide.
Welcome to the Quilting Board!

Any suggestions for the best way to join batting pieces so that they are wide enough to fit my quilt. The quilt is a 58" square and my batting is only 48" wide.
You can butt them together and use a wide zigzag or there is a fusible tape you can use made just for this purpose. I have used it with cotton batting, not sure if it will work with poly, I'm sure someone else will clarify
i've used the tape too with cotton, i don't think it works with poly
I've used the tape so far with cotton, poly and Dream Green - works great
i've used the tape too with cotton, i don't think it works with poly
I use a basting needle and whip stitch the pieces together.
I make sure the pieces to join have a straight edge by rotary cutting them. Then I use the mending or zigzag wide stitch to connect the two pieces.
I use leftover pieces of lightweight fuisible interfacing.
I use a wide zig zag too. If the batting has a lot of loft I whip stitch it by hand.
here's my method:
I hand whip scraps together.
I use a slip knot for a knot, go down left hand batting, up immediately next to stitch, needle thru the loop, pull tight.
You are up on the left, sewing about 1/2"-3/8" from the edge. stitch down in between the 2 battings, up on the right batting, down in between, up on the left batting. always up through the batting & down in the seam. When you pull it tight, it butts, no lumping, the stitches inbetween keep it from bunching. stiches are about 3 to an inch. goes really fast.