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Just so, what is curtain stack back?
Stack back is the amount of space the curtains occupy when in the fully open position.
Likewise, where should curtain rod brackets be placed? Generally, hanging curtain brackets on the wall above and outside the window molding looks best, since it allows fabric to fall gracefully. If you have detailed window frames you don't want to cover, an inside mount (hanging curtains within the frame, as you would with a tension rod) can work.
Also Know, how much should I allow for curtain gather?
We would always recommend at least 2.5x gather, but we are often asked by customers on a budget whether dropping to 2x or 1.5x gather will save them money, and the answer is obviously yes!
Do eyelet curtains need to be double width?
You need to allow for both flat panels to be a minimum of one and a half times the curtain pole width. I personally think they look much better at double the pole width. Give or take a couple of inches. This allows the curtains to have enough fabric to allow the pleats to look right when hanging over your window.