When I do it, each side ends up 1/2". Are you being careful with your 1/4" seam when you sew the two pieces together? Cut the strip for the front binding 1" and the strip for the back binding 2". After sewing the two pieces together, it should measure 2-1//2". Fold that in half, wrong sides together, and it should measure 1-1/4". The front side should have both colors on it, the color for the back side being 1/2" and the color for the front being 3/4". Lay the two color side against the front of your quilt and stitch 1/4", which will leave each side of your binding 1/2". If you're still having problems with it, send me a PM. Good Luck.