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The Truth About Insulation R Values

By weaverweath16659627, May 21 2015 04:56PM


Higher insulation R values do not tell the whole story

Insulation resists heat movement through the insulation material. R-value measures the resists through the insulation (called the conductive heat flow). All the R values for different insulation is conducted through testing in a lab not real world conditions. The lab testing does not take into account how well the material stops heat movement from convection, carried in the air. Air leakage can cause up to half of your home’s energy loss.


Important Factors for Air Sealing

R-values do not measure air flow through a material. The most popular insulation in the U.S. is fiberglass insulation. Since there is air gaps along ceiling joist and many other building cavities that fiberglass do not air seal. The effectiveness is greatly reduce in the fiberglass or cellulose insulation without the proper air seal. Until recently building codes did not require the proper air sealing. With proper air seal fiberglass and cellulose become a much better insulation. With spray foam insulation you get total air seal and high R values. If you want a better quality insulation call us for air sealing options.


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Health and Safety Reason for Air Sealing

When your house has 50 percent or higher relativity humidity in the heated area. This becomes a problem with no air seal in the attic. The hot moisture air leaking into your attic space can cause large scale or spot condensation. Signs of condensation on roof would be water marks, rusty nails, mildew, or mold. Adding more ventilation is the wrong thing to do. You just cause more leakage from the house (stack effect) into the attic. More house air means more moisture which will bring on more condensation. Stop this issue with proper air seal. You will save a lot of money and your building with the proper air seal.



P.S. We specialize in retrofit insulation. If you want a contractor that cares and spend the time to get it right the first time call us. 717-450-3286




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