When discussing window film options with a property owner, we sometimes are unaware of the make-up of a particular window. The owner may think that they have Low-E windows, but have no paperwork to confirm that fact. In that case, without the use of a Low-E detection meter, is there a way to determine if a window has a Low-E coating and on what surface of the glass it is applied? Fortunately, the answer is yes. Let's first define the differing surfaces of a window so that we are all on the same page. A basic double pane window is constructed like the picture below. The surface numbers allow everyone to understand exactly what surface of a dual-pane unit everyone is referring to. Starting from the outer-most surface, the numbers are as follows:
- Surface 1: Outside surface of the outside pane of glass.
- Surface 2: Inside surface of the outside pane of glass.
- Surface 3: Outside surface of the inner pane of glass.
- Surface 4: Inside surface of the inner pane of glass.