Darn, I forgot to add that the upper stack-back of Roman shades on French doors can and will be substantial, and will bump the shade out quite a bit when the whole shade is raised. I once had a potential client who was quite peeved about her shades doing so--someone else had made it for her, thankfully---and had done a good job---but there was nothing I could do to remedy the problem. If she had chosen a much lighter weight fabric, or had the shades mounted above the doors, the bumpout/skewing could have been lessened or cured. Here I'll note that, at the time, I did not know this sort of mounting/bulk could casue this problem, either. Some things one finds out simply by doing.Lucky for me, I was able to observe it and make notes for the future. If you can picture it, the shade lies flat when down. As you raise it, each fold is drawn up behind the next fold, creating 'stacks' of shade fabric. On a long window or door, the fabric stack can bump away from the window quite a bit, and, as a result, won't lie in place when drawn up. Sometimes the folds/bulk just skews to one side. Now, I think the tunnel tape might give greater control over the skewing problem, but you'd still have bulk to deal with. Really, it wasn't unlivable, just a tad awkward looking. Cea