Originally Posted by Quilter7x
Adding 7/8" to the FINISHED size of the block is the way I was taught.
I draw boxes on the back side of the lighter fabric. If my finished size is going to be 4", then I draw boxes that are 4 7/8". Then I draw a diagonal line through all the boxes and sew a quarter inch on either side of it, then you cut on all the lines. I have pictures at home if anyone wants to see them.
I also use this same grid method, adding 7/8 to the finished size. The other nice thing about this grid is you can sew it in a continuous line on either side of the diagonal if you lay your grid out right. I have found it described in several books. I think the book "Quilts Quilts Quilts!" might have instructions on how to do it this way (in the back section). I have found this method best for me. I have another book that talks about making them out of bias strips and fat quarters but have yet to try that way.