Do Residential Window Films Cause Glass Breakage?

Window Film Description

• Window films are applied to windows to reduce the amount of solar heat transmission through window glass. The stuff increases solar reflection and absorption through the glass, which provides homes with protection from ultraviolet rays. Films are available in reflective and colored varieties, though films appear clear to the human eye regardless of type. Dyed films use color to absorb solar energy, while reflective films feature a metal coating that increases the window's solar energy reflection. Reflective window films are better at reducing heat than dyed films.

How Breakage Occurs

• Cracked or broken glass from window film application is rare. It occurs because the film increases the temperature of glass surfaces under direct sunlight, which puts stress, or thermal shock, on the glass. This is most common around window edges. Glass can crack around window edges that are already scratched or contain other flaws.

Reasons for Breakage

• In addition to the condition of the glass edges, breakage can occur due to the age of the glass, as well as how it has been handled. Other contributing factors include the size and shape of the glass, thickness and strength of glass, the type of film that is used, exterior and interior shading, and indoor and outdoor temperatures. Use film on newer windows that are free of flaws and cracks for best results.

Additional Window Film Benefits

• Besides lowering the amount of ultraviolet rays that enter your home, window films feature additional benefits. Though it is nearly impossible to prevent faded furniture due to sunlight exposure, window films will reduce the amount of fade-related damage to furniture and other household objects. Manufacturers of window films generally guarantee that films will not lose their potency over time. They can also potentially reduce the amount of water and debris penetration from severe storms.