I'm having a Milgard aluminum window installed (XOX horizontal sliders). My current window has a wood frame (casements and picture window). The house exterior is stucco.
One dealer says he'd definitely use a block frame (H-bar for slope sill); another says a Z-bar is necessary.
My priority is to protect against water damage; I'm less concerned with the cosmetic appearance of the window.
Which method of installation would you recommend, and why? Thank you!