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What Is R-value and Why Is It Important?

What is R-value?

R-value is a measurement that indicates the insulation value of your garage door and its resistance to heat flow. A higher R-value indicates a higher level of insulation allowing you to keep heat in during the winter and keep your garage cool in the summer. Insulated garage doors also have a stronger structural integrity than lower insulated doors, and they can also help to reduce outside noise. Garage doors range in R-values depending on the make of the door and the insulating material use. Polystyrene (styrofoam) and polyurethane (spray foam) are the two most prevalent insulating materials used in garage doors. Polystyrene consists of solid sheets that are inserted into garage door cavities and provide an R-value between 3.7 to 7.4. Twice as effective as polystyrene, polyurethane is a foam that is sprayed into the door cavities and expands and bonds to the door. Garage doors with polyurethane are thinner than doors with polystyrene but have higher R-values ranging from 11 to 14.8+

Why is this important?


If your garage is connected to your home and/or you are using air conditioning when it’s hot or heating your home during cold winter months, you can lose money if your garage door is not properly insulated. Without insulation, heat will find its way into your house when it is warm or escape from your house when it’s cold. In climates with very low or very high temperatures, insulation can help save you money on your energy bill. An insulated garage door is particularly important if you spend a lot of time in your garage or if there is a living space above or next to it. As an extra bonus, insulated garage doors reduce outside noise from your neighborhood. Likewise, if you make a lot of noise in your garage (e.g., using woodworking tools) that noise level will be reduced for your neighbors.

Doors that provide insulation


While most of our doors offer insulation options, some doors provide better insulation than others. Our highest insulated doors are constructed of steel. Wayne Dalton’s Classic Steel door model 8500 provides the best insulation with an R-value of 16.22. Wood doors and modern glass doors typically provide the least amount of insulation; however, different models provide different levels of insulation. Polystyrene sheets can be inserted into certain wood door models to add insulation. With modern glass doors, you have the option of having polyurethane insulation inserted into the aluminum rails and styles of the door, and you can choose heavier insulated glass panels.

To find out which R-value is right for your home, please contact us. Let’s put R-value to work for your home.


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