Window Fins Vs. No Fins

Window Fins

• A window with fins is also referred to as a new construction window. The fin is a metal strip that extends over the edge of the outer window sash and has pre-drilled holes. The fins are a component of the entire window assembly and extend on all sides of the window. The window frame, itself, is directly behind the fin. When the window is installed, the installer hammers galvanized nails through the pre-drilled holes on the window fin to attach the window to the 2-by-4 studs that frame the exterior of the home. The pre-drilled holes help installers position the windows properly and secure them directly to the studs of the building.

No Window Fins

• Windows without fins are also referred to as replacement windows. This type of window is used to retrofit or replace a window in an existing home, versus a new construction. Windows without fins are attached to the side jambs of the home after the old window is removed. As a result, you do not need to strip down the exterior cladding because fin-less windows are not attached to the exterior studs of the home.

Similarities

• Windows with and without fins come in a variety of styles, including wood, vinyl and metal frames. They can also accommodate energy efficient choices, such as double and triple-pane glass to increase thermal efficiency and decrease heat loss in winter and heat gain in summer. If you live in a cold climate, you should explore options for upgrading to multiple pane glass when reviewing your choices for windows with or without fins to help lower your utility bills.

Differences

• Windows with fins help block cool or warm air from entering from the outside. Insist that the installer uses the appropriate caulking for the type of cladding of your home (brick, vinyl, wood, etc.) to create the tightest seal possible. Windows with fins require removal of existing cladding before installation surrounding the window opening because the fins have to be attached to the studs. Windows without fins do not require removing or disturbing the existing cladding. In most case, windows without fins are less costly, because you can retrofit them to work within the existing window opening.