Ripplefold, you will need a snap-tape track system for the install.

Keep in mind, the lighter fabrics require less stackback space. Sheers/semi-sheers can be gorgeous.

thank you. that makes sense.

Going with this: Lesley Ivory. It looks like a semi sheer ( Light Blocking 35%-45%).

How much extension should I plan for with 110" window?

Also, what is the common designers header choice?

Your rod dimension depends on what the room needs and how you plan to stack the drapery.

Some times you want the panels to cover the window trim and sometimes you don't. It depends.

thank you. I really like to maximize the open window space. So, like option 2 in your last picture.

My window (with trim) is 110 3/8". I have another 11 1/2" on the left side. On the right a bit more.

I might be overthinking this. Does ripple fold require more runners than pleated for the same window space? And if so, woudl this affect the stack size? More constrained by runners than curtain?

Wall 11.5

Casing 5

Drapery should come over window min 6" when stacked back so this would equal an 18" stack baclk and don't forget your returns (2.5-3" depending on what you spec)

For a regular drapery fabric (not sheer not upholstery weight) your most compact stack back is is a single edge pleat. You want the fabricator to train them before install for the most condensed stacking. Once they are trained they operate beautifully falling back into a tight stack each time. You must do 2.X width minimum.

so return 2.5-3" is the folded depth of the curtain?

A return is as follows, where it says projection that is the return. Properly installed drapery panels on a regular rod should be "returned" to the wall. If you have a French rod they will just move back on the ring around the corner of the rods.

standard rods

one ring should also be on the other side of the bracket for two reasons 1. it faciliates the return position so it goes back to the wall without wrapping a pleat on the side 2 if the drapery panels are operable it keeps the panel from being pulled away from the end

french return rod with a standard return installation

french return . with the rings wrappign the corner

these draperies are not installed correcly

drapery panels should never sit flat on the front of a rod.