Thermal Expansion

A window structure is composed of various materials such as glass, uPVC, aluminum, wood, rubber, and metal. All of these materials respond to temperature changes by expanding or contracting as temperatures rise or fall. This means their dimensions shift, which is why it’s essential to allow for space that accommodates these movements without causing damage to the window.

Depending on the material, expansion can range from approximately 1/32 to 1/8 inch. These values are based on typical climate conditions. If proper tolerance is not accounted for, excessive pressure can lead to functional limitations or even damage to the window system.