When measuring for curtain height we will measure the full height from where the curtain will mount at the top all the way down to where the curtain will stop. Nothing will be added or subtracted from this height as this should be our Final build height (Including top track, the curtain itself, and the bottom bar.) We recommend installing the curtain as high as possible so when it is not in use and rolled up they will not be hanging down into the opening but rather tucked up high out of sight and out of mind.