Head-on view of inflated augment showing seaming and (interior) buck placement — Left Image: Multiple wrinkles and valleys pull into the augment crown due to buck placement well inside of the seaming and interior air pressure. Once foamed these become hardend channels that direct rain run-off behind your window trim. The buck was made 1.5" larger than the hypothetical window on all sides.
Right Image: The buck should be sized to fit just inside of the vertical plane and Airform seaming of the augment. Hence, crowns, valleys and wrinkles are minimized. The shape is taut. The window framers will have ample room to install or retro-fit new window technology years later. Rain run-off is also improved to roll off the sides of the augment.