Any type of board you add to your folded fabric will take up space. Think about a stack of 100 boards needed to fold 100 pieces of fabric. For many people, that's fine, but if you're short on space, you may have to find another way.
Out of necessity, I am sewing clothing now, but I want to get back into quilting as soon as I can. Organizing my fabric stash so that it is neatly stacked and visible is important to the way I like to quilt. I've gone so far as to estimate folded yardage and how much shelf space is required to hold it! One yard of fabric folded 6" X 11-12" takes up an average 1/2" of vertical space. Thickness of fabric and weight of stack makes a slight difference. I like the ruler method to fold, then stack into shelves with dividers, so I don't end up with teetering stacks. I have a few shelves now, but need to subdivide in some way.