Window Frame Types

Deciding how you plan on installing a window will determine which window frame to use. I'll review three of the most common frames and explain what type of installation is typically paired with it.


Nail-On Frame

Nail-on frames are used when either the house is barely being built or the frame to an existing window is being modified. Essentially a nail-on window is applied to the frame of the the building. It requires flashing and caulking to seal the window and it is designed so that the exterior finish (stucco, siding, etc.) come flush to the window. Nail-on windows are appropriate for new construction but if the window is already existing you should consider what follows.

Retrofit Frame

Retrofit windows were developed in order to avoid tearing out the frame of an existing window, which was the proper way to install a window before they created retrofit windows. The nice thing about retrofit windows are that they sit over the existing frame and slip in relatively easily (provided you've measured correctly). When its done correctly retrofit windows are a fantastic application. But a word of warning. Retrofit windows have earn of reputation of being an easy installation but can be a headache if you don't consider exactly how it will be installed. An ill sized window is as good as a hole in the wall. Also, retrofit windows protude from the wall. It is a look that some people love and some people hate. Pay close attention to the frame when you are selecting a manufacture, there is a range of styles .

Block Frame

Similar to retrofit windows, these windows are designed to avoid pulling the existing frame completely out. In addition, block frames are made specifically for existing wood windows, where they are made to sit into the opening provided that it is in good condition. They are the least involved, in regards to installation, but they are also the most limited in application. Most windows will call for a retrofit application.