Designation:D7954/D7954M−15aStandardPracticeforMoistureSurveyingofRoofingandWaterproofingSystemsUsingNon-DestructiveElectricalImpedanceScanners1ThisstandardisissuedunderthefixeddesignationD7954/D7954M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thispracticeappliestotechniquesthatusenon-destructiveelectricalimpedance(EI)scannerstolocatemois-tureandevaluatethecomparitivemoisturecontentwithininsulatedlow-sloperoofingandwaterproofingsystems.1.2Thispracticeisapplicabletoroofingandwaterproofingsystemswhereininsulationisplacedabovethedeckandpositionedunderneathandincontactwithelectricallynoncon-ductivesingle-plyorbuilt-uproofingandwaterproofingmem-branesandsystemssuchascoaltar,asphalt,modifiedbitumen,thermoplastics,spraypolyurethanefoam,andsimilarelectri-callynon-conductivemembranematerials.Thispracticeisalsoapplicabletoroofingandwaterproofingsystemswithoutinsu-lationplacedabovemoistureabsorbingdeckssuchaswood,concrete,orgypsum,thatareincontactwithsingle-plyorbuilt-uproofingandwaterproofingmembranesasdescribedabove.1.3Thispracticeisapplicabletoroofingandwaterproofingsystemsincorporatingelectricallynonconductiverigidboardinsulationmadefrommaterialssuchasorganicfibers,perlite,cork,fiberglass,wood-fiber,polyisocyanurate,polystyrene,phenolicfoam,compositeboards,gypsumsubstrateboards,andotherelectricallynonconductiveroofingandwaterproofingsystemssuchasspray-appliedpolyurethanefoam.1.4Thispracticeisnotappropriateforallcombinationsofmaterialsusedinroofingandwaterproofingsystems.1.4.1Metalandotherelectricallyconductivesurfacecover-ingsandnear-surfaceembeddedmetalliccomponentsarenotsuitableforsurveyingwithimpedancescannersbecauseoftheelectricalconductivityofthesematerials.1.4.2ThispracticeisnotappropriateforusewithblackEPDM,anymembranescontainingblackEPDM,orb...
