Before You Buy

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Energy Efficiency

A garage door opening is the largest moving object in your home. Insulated garage doors will help to reduce the transfer of heat or cold air into your garage. This is important for a number of reasons:

1) If your garage is attached to your home, air in the garage can travel through the doorway to your living area. An insulated garage door will reduce the transfer of air from the outside to the inside.

2) If you use your garage as a workshop, your comfort will be a top priority. An insulated garage door will help keep the temperature in the garage within a narrower temperature range as compared to the extreme range of the outside temperature.

3) If your garage is below another room in your home, air can travel through the ceiling of the garage into the floor of the room above. An insulated garage door will keep temperatures in the garage fairly stable to reduce the temperature fluctuation in the room above.

4) An insulated garage door is generally quieter and has a more attractive interior than a non-insulated door.


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 higher the R-value number, the better the insulating properties of the material. However, an R-16 value is not twice as good as an R-8 Value. R-16 does not offer twice as much thermal resistance or twice the energy savings of an R-8 value. A value of R-16 offers a 5% reduction in heat flow and a 5% improvement energy efficiency than a value of R-8, not 50%. See chart below for R-Value comparisons.

A garage door's insulating capabilities can be greatly affected by the door's construction mostly. Delden's door section construction and insulation options help keep your garage as comfortable as possible.

Construction options for DELDEN® low maintenance steel doors include:

  • Series 1000 Single-Layer: Steel  (R-Value: N/A)
  • Series 2000 Double-Layer: Steel + Insulation  (R-Value: 6.84)
  • Series 3000 Triple-Layer: Steel + Insulation + Steel  (R-Value: 6.48 -19.40)

Effective January 1, 2009, the Door and Access System Manufacturers Association (DASMA), which represents over 90% of the door and access systems manufacturers in the US and Canada, put into effect a voluntary standard for manufacturers to list R-values in accordance with DASMA Technical Data Sheet (TDS) #164.

Read more about DASMA TDS-163

When comparing R-values among garage door manufacturers, be sure to look for statements that mention DASMA TDS-163.

Calculated R-values for Delden garage door sections are in accordance with DASMA TDS-163 and based on actual independent testing per ASTM 518.

R-Value Education Single Sheet