How to Install Replacement Windows in Stucco

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    • 1). Measure the replacement window and the window jamb to make sure the new window will fit in the jamb. Do this before you remove the old window sashes.

    • 2). Cut the old sash cords with a sharp knife to remove the window sashes, then carefully pry away the window stops with a small pry bar and putty blade.

    • 3). Lay a continuous bead of caulk along the interior edge of the window jamb's blind stop.

    • 4). Lift the replacement window into the jamb opening and press it against the blind stop. Set a screw loosely into the upper right and lower left corners to hold the window in place.

    • 5). Square the window with a tape measure. Measure each diagonal and place wooden shims in each corner until both diagonals are exactly equal length. Attach the remaining screws loosely to keep the window square.

    • 6). Ensure the window is level by placing a four-foot level on the right and left sides of the window. Slide shims between the window and sill if needed.

    • 7). Tighten the screws and cut the shims level with the window. Stuff strips of fiberglass insulation between the window casing and the sill to prevent drafts.

    • 8). Cover the sill with a sill filler strip and apply caulk around the interior of the window casing. Smooth the caulk with your fingertip or a putty blade.

    • 9). Go outside and apply an additional bead of caulk to the exterior window casing. Smooth this down as well to form a waterproof seal around your new replacement window.

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