Folding seams in one direction
I find that when I press seams in one direction it takes up a tiny bit of fabric because of the fold. As a result, one piece of fabric is a tiny bit smaller than the other. Over the construction of a block this results with the block not being exactly the correct size. Or in blocks with many pieces, they all don't line up properly. For example, in doing a block like Birds in the Air, when I go to attach the pieced side to the piece of fabric that has no seams, they don't match up perfectly.
Stitching the seams open helps some until you get a place where a bunch of corners come together. Nesting the seams helps, but not a perfect solution.
Does anyone use a techinque that takes into account this fabric shrinkage due the seam allow?