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An R-Value is a measure of an insulation product's resistance to thermal heat transfer. It's a measure of how long it takes a heat "absorbing" product to absorb 100% of its potential and begin to transfer that heat out the other side of the product.<br>
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What is Foil Insulation R Value? www.aerolaminsulations.com
InsulationismeasuredinR-values.Thisisalsoused todescribetheinsulatingproductsresistanceto transferheatandhowtheproductwillperformasa heatinsulatororabsorbit.ThehigherR-value ensuresbetterinsulationofheatflowinginoroutof thehome.Whenreferringtoreflectivefoilinsulation, theR-valuemeasurementrelatestothetotalheat resistanceabilityoftherooforwallafterthe insulationisinstalled.Radiantheatisoften overlookedbecauser-valuedoesnotaccountfor radiantheat.Radiantheattransfersupto75% ofits totalheatgainorlosstothebuildings. Reflectivefoilinsulationblocks97% oftheradiant heattransferandformsathermalbreakorvapor barrier,fromtheplaceitisinstalled.Simplystated, foilradiantbarrierreflectsheat.Bydoingthis,it makestheR-valueofamaterialmoreeffective. RadiantbarrierfoilbyitselfdoesnotprovideanyR- value; theproductalongwithwhichthereflective foilisdeckedhasitsR-value.WhenRadiantBarrieris attachedtosomeproductsofBubbleInsulation,the productwillthenhaver-valueofthebubbles, sheathingorOSBdecking,buttheReflectiveFoil doesnotactuallyprovideanyadditionalR-Value. BubbleInsulationhassomeR-value.Ifyouhaveair flowaroundtheobject,R-Valuedoesnotmatter.For instance,ifyouwearajacketandallowtheairtoget betweenyouandthejacketitwillnotmatterhow thickthejacketisbecauseyouhavenoairspace.So unlessyoucompletelyair-sealthebubblefoilyou willnotgetthefulleffectivenessoftheR-value R-Valuemeasurestheinsulationresistanceto conductiveheat,whichisheatbyphysicalcontact. Thisisimportantwhenyouarefillingupawallcavity withbulkinsulation,andthere'scontactbetween theinteriordrywallandtheexteriorsheathing. TheR-valuechangesbecauseofthetypeofheatyou useandwhereyoulive.Italsochangesbetweennew andexistinghomes.TofindtherecommendedR- valuefortheareaofthecountryyoulivein,contact yourlocalelectriccompanyorgascompany.
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