Garage Door Education: R-Value 101

3000 FIP Classica - Olympus-DC TW SP-BB only (13.35 R Value)The garage is often the largest opening to a house, making it very vulnerable to weather extremes. An insulated garage door can help reduce the transfer of heat or cold air into your garage and other areas of your home, thus improving your home’s overall energy efficiency.

When doing research on different types of garage doors, you may have come across an “R-Value” measurement associated with garage door insulation.

What is R-Value?

R-Value is a measure of thermal resistance used in the building and construction industry.  Specifically, R-Value is thermal resistance to heat flow. Many manufacturers use R-Values to show the energy efficiency of their product. This number is calculated based on the thickness of the insulation and its chemical properties.

The Truth About R-Values

The higher the R-Value, the better the insulating properties of the material.

This above statement is true. However, an R-16 value is not twice as good as an R-8 Value. It does not offer twice as much thermal resistance or twice the energy savings. A value of R-16 offers a 5% reduction in heat flow and a 5% improvement in energy efficiency over a value of R-8.  See chart for R-Value comparisons.


For more information about garage door insulation and energy efficiency, visit

About Amarr Garage Doors

Amarr is one of the world's leading brands of garage doors for residential garages, warehouses, commercial buildings, shopping malls and other commercial applications.
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10 Responses to Garage Door Education: R-Value 101

  1. thermadoor says:

    Great article good to read from someone who actually knows about r-values and not some other random who writes blogs thanks

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  4. Great article! I just posted something today on this on our website.

  5. Matt says:

    I’m trying to determine the U value of a metal garage door that was already on my house when I bought it. The door comes from y’all but I can’t seem to find the U value anywhere.

  6. Excellent write-up. I definitely appreciate this site. Stick with it!

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