February-March 2026:
Choose and order windows. Actual size is one inch smaller than rough opening.
Cut out the rectangle. Add sheathing (or thin plywood) to sides if needed/possible.
Clap board onto sill to create angle down & out. Counter pieces under side jamb.
Zip tape outside-to-wall faces of sides and header and sill. Stretch tape at corners.
Dry fit the window. Then add caulking/sealant. Set and fasten window. Horseshoes at bottom.
Zip tape sides then head.
Installing window with a nail flange. Build Show, Travis
Installation. He doesn't slope the sill. Tim
Sealing & sloped jamb. Made for a retrofit (non-fin) window.
Four solutions for window jamb extensions with exterior insulation. Build Show, Matt
Liquid flash the entire window opening, including the buck. This is video 1 of 4. I don't think I'll use this process -- to costly. FineHomebuilding, Jake Bruton
How to trim around the inside of the window, especially if the drywall-window line is uneven.
The first 4:30 of this video shows how to cut the z-flashing and fold it at the ends.