The wall framing is covered by sheathing and the window will be mounted with the nailing fin flush against the sheathing. Not all window types may be installed. Jan The most prevalent of all window types is the residential grade window with a nailing fin.
While the most prevalent, many engineers. Using ½” roofing nails, secure one bottom corner of the unit by nailing thru one of the pre-punched holes in the nail fin.
Metal and vinyl windows have an integral flange (also known as a nailing fin ) that attaches to the house. Typical window trims installed over a window nailing fin need to be shimmed or pulled back for the trim to lay flat. Matthew PK offers some very specific instructions.
I happen to disagree with most of them, but they may work for some windows. I will simply state that every new. Installation Guidelines for all Quaker products with nail fins. Nailing flanges and drip caps (integral or applied) do not take the place of window flashing.