Best material for insulating a garage door?
redmaxz37 | Posted in Energy Efficiency and Durability on
Is Prodex Insulation really as good as they claim?
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Prodex "insulation" is a type of foil-faced bubble wrap. Distributors and marketers of Prodex products are often guilty of exaggerated R-value claims. Most of these products have a limited R-value ranging from R-1 to R-3. As long as you realize that you are getting a very low R-value, you can use the product if you want.
For more information on exaggerated claims for Prodex products, see the comments on this page: FTC Cracking Down on False R-Value Claims.
It's hard to add R-value to a garage door. In general, garage doors are so leaky that the best approach to improving a garage door is to focus on air sealing (by improving the weatherstripping) rather than trying to add R-value. For more information, see Energy-Efficient Garage Doors.