Continuous R-Value, reduced air infiltration and thermal mass all make up the ICF Effect New energy codes, higher fuel prices, and colder winters have all contributed to an increased awareness of energy efficient construction. For consumers and builders, this means a stronger focus on increased “R-value” of the building envelope. Understanding the history of code prescribed R-value will give perspective of this measurement as it is used today. Prior to the oil crisis in the 1970’s, energy was cheap and little focus was placed on insulation, as evidenced by the lack of any insulation in “midcentury” homes. The skyrocketing fuel prices triggered a
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