Is Window Film Bad For Double-pane Windows?

Is Window Film Bad For Double-pane Windows?

Window film can be bad for double-pane windows if it is installed improperly or if the wrong type of film is used.

Here are some potential issues to consider…

  1. Heat Absorption – Some types of window film, particularly those with dark or reflective coatings, can absorb heat from sunlight. When applied to double-pane windows, this heat absorption can increase the temperature of the inner pane of glass, potentially causing stress and thermal expansion that could lead to seal failure or even glass breakage. This is more likely to occur if the window film is installed on the inner surface of the outer pane, rather than on the outer surface.
  2. Seal Damage – Double-pane windows are typically sealed to prevent air and moisture from entering the space between the panes. If window film is installed improperly or if it creates excessive stress on the window frame or glass, it could compromise the integrity of the seals, leading to air or moisture infiltration and reduced energy efficiency.
  3. Warranty Voidance – Some window manufacturers may void the warranty on double-pane windows if aftermarket window film is applied. This is because the use of window film can alter the thermal characteristics of the window and increase the risk of damage or failure, which may not be covered under the warranty.
  4. Moisture Trapping – Improperly installed window film can create pockets of trapped air or moisture between the film and the glass, which can promote condensation and mold growth. In double-pane windows, moisture buildup between the panes can indicate seal failure and compromise the insulating properties of the window.

To minimize the risk of damage to double-pane windows from window film, it’s important to…

  • Choose a high-quality window film that is specifically designed for use on double-pane windows and has been tested for compatibility.
  • Ensure that the window film is installed by a professional installer who has experience working with double-pane windows and understands the potential risks and precautions.
  • Follow manufacturer recommendations and guidelines for installation, including proper surface preparation and application techniques.
  • Monitor the windows for signs of damage or seal failure after installation, such as condensation between the panes or changes in performance.
  • Consult with the window manufacturer or a qualified professional if you have any concerns about applying window film to double-pane windows.