If you've done any research into insulation or building materials lately you've likely come across the term 'R-Value.' Simply put, R-Value is a measure of thermal resistance or indication of resistance to heat flow. The higher the R-value, the greater the insulating effectiveness.

A term you might not be as familiar with is 'U-Value.' U-Value has greater relevance in the window world as it measures the rate of heat loss through a material (such as glass).

U-value is a measurement of heat transfer through film due to outdoor/indoor temperature differences.

In all aspects of home design the goals should be to achieve the lowest U-Values possible because, the lower the U-value, the less heat escapes through the material . For example, single glazed windows have a typical U-value of 5.6 while double glazed windows have a typical U-value of 2.8. Adding a layer of window film to new or existing windows is a great way to further reduce the U-Value of the window.

As mentioned in a previous post, windows and doors can account for up to 20% of a homes heat loss so it only makes sense to ensure all windows have the lowest possible U-Value. If you have questions about U-Value or the insulating properties of window film please feel free to contact us.