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Labeled vs. Installed Performance - Explained <br /> 4.0 <br /> Q: Did an independent laboratory conduct the tests? Who Labeled R-value <br /> funded the tests? 19 —A— <br /> A: Oak Ridge National Laboratory conducted the research. 18 8% loss <br /> Oak Ridge is completely independent and funded by the V <br /> US Department of Energy. 10 17 <br /> 17.4 <br /> Q: Why were the tests conducted? 16 <br /> A: According to Oak Ridge, builders, architects, designers, 15 <br /> and homeowners want energy-efficient walls. The best <br /> way to determine how insulation systems perform is to 14 <br /> build and test full-size walls. 11 <br /> 13 <br /> Q: Can't R-values be used to compare insulation systems? <br /> A: R-values are a good starting point- but they are the results <br /> of small, meticulously prepared laboratory samples and do Fiberglass baits <br /> not necessarily reveal how an insulation system performs before it is installed. <br /> once installed in actual buildings. Different insulation Figure 3-Before any of the installation <br /> systems with the same laboratory "R-value" can deliver tests were begun,the fiberglass batts were <br /> much different levels of comfort and energy efficiency. 12 tested and found to provide R-n.a <br /> 4111, Q: What did the researchers find? 19 Labeled R-value <br /> A: The researchers found that fiberglass batts deliver far less T ill <br /> than their labeled R-value in real walls, as shown in <br /> 18 11% loss <br /> Figures 3 and 4. 13 17 V <br /> 17.0 <br /> Q: Where does the R-value go? 16 <br /> A: Technically,the "R-value" doesn't change because it is 15 28% loss <br /> based on specific laboratory test claims by the fiberglass <br /> manufacturers. However, the Oak Ridge research reveals 14 v <br /> the following: <br /> ➢ "R-19"labeled fiberglass baits have an R-value of 13 13.7 <br /> 17.4 before they are installed. 14 <br /> > "R-19"fiberglass batts have an R-value of 17.0 when <br /> installed perfectly (the scientists installed the baits "Perfectly "Commonly <br /> before installing the exterior sheathing to precisely fit installed" installed" <br /> Fiberglass batts. Fiberglass hafts. <br /> the baits in place from both sides). 15 <br /> > "R-19"fiberglass batts have an R-value of 13.7 when Figme 4-Taking the framing,OSB,and <br /> installed as commonly found in actual walls. 16 gypsum board into account,the R-19 <br /> fiberglass batt insulation provided much <br /> less than its labeled R-value <br /> srmeec: <br /> `I.ECyi,4a,1.lame,An.Deejnat.ad Pw CEIm,The Whole WalTMimal Rrtaeemee Dineen!-Oa De Net'."Dermal Performance <br /> R the Fauna Envelopes ofBuloings V0.1990. <br /> 'R M N ad."A Snay of the Effects of Inanimate Gap,an Buil6 W Ilea Lama.ha Report"IoMV Mmriue Saks Cop.149 <br /> 'Ctme.eta <br /> 'Wad Rvalaei',Penal Cartepeadew,?OSJ <br /> "Caneoao.Ha. <br /> "D.W Y,Moah,TdgMoe Conernuon.11gl. <br /> n amino,dal. <br /> 1 YCdw E <br /> Seem loea.Ha. <br /> Sawvlm Rpm Chases.n Y. <br />