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Simply put, R value is the standard for measuring the thermal resistance of various construction materials. For example, it measures the amount of thermal conductivity cold or heat that is able to pthrough a wall. Therefore, the higher a material s R value, the better it will be for providing insulation.. Higher is better when lo.ng at garage door R values, but it s not the only factor to consider. Today s garage doors with polyurethane insulation will have an R value of Garaga s residential garage doors provide up to R , but you also want to choose a door that has otherwise good construction.. The higher the R Value, the better the insulating properties of the material. This above statement is true. However, an R value is not twice as good as an R Value. It does not offer twice as much thermal resistance or twice the energy savings..We are often asked about what the R value is on new Garage Doors. Often building plans and specs require a particular R value. Some of these specifications .