Mysest56 
May 14, 2022
A picture window is a big casement window with no moveable sashes. A picture window, also known as a bay window, gives you the sensation of being connected with the exterior, allowing at ample light while protecting from the elements. Many picture windows are made around aluminum framesthat are relatively inexpensive and simpler to install than more conventional wooden-framed windows. Don’t be intimidated by the idea of replacing a window, then they may be installed in a couple of hours with a few basic hand tools.
Remove the outside trim surrounding the window by sliding a flat pry bar behind the trim and carefully prying it off from the wall. Harness the pry bar with a hammer if it will not slip between the trim and the shingles readily. Save the trim boards to be used to trim the new window.
Loosen and remove the screws holding the fins around the outside of the window using a power drill equipped with a screw tip.
Score any caulking across the fins using a utility knife, then slide the end of the pry bar between one substrate along with the wall, and gently pry the window loose. Pull the window and aluminum frame out of the window opening up and put it aside.
Scrape or cut away any excess caulking using a putty knife from round the window opening which may impede the setup of the new window. Then position the new window to the framework. Have an assistant hold the window in place from the outside as you enter your home.
Adjust the window so it’s centered horizontally, then place a level on the framework of the window. Slide hardwood shims between the framework of the window and the wood framing around the opening to center the window at the opening and also to ensure that the window is level.
Carefully lift the window out of the opening in order to not disturb the position of the wood shims. Apply a generous bead of exterior caulk across the interior of the window fins, then reposition the window back to the framing on the shims. Re-check the window position horizontally, vertically and with the level, then attach it to the frame using 2-inch stainless steel wood screws through each of the mounting holes in the fins.
Reattach the wood trim around the window as it was removed earlier, then fill any gaps between the trim and the siding with outside caulk.