IICRC - APPLIED STRUCTURAL DRYING EXAM QUESTIONS WITH CORRECT ANSWERS 2025

EXAM QUESTIONS WITH CORRECT
AirKFiltrationKDeviceK(ADF)K-KcorrectKanswer-
CommonlyKcalledKanKairKscrubberKorKnegativeKairKmachineKifKairborneKparticlesKneedKtoKbeKreduced,KyouKc
ouldKuseKanKappropriatelyKinstalledK_______K________K________



AirKFiltrationKDeviceK-KcorrectKanswer-AFD



AssemblyKConstructionK-KcorrectKanswer-
PriorKtoKdeterminingKtheKbestKdryingKsystemKforKaffectedKmaterials,KrestorersKshouldKidentifyKandKunderst
andKtheKassemblyKconstructionK(ieKwallKassembly,KfloorKassembly)



CategoryK1K-KcorrectKanswer-
waterKoriginatesKfromKaKsanitaryKsourceKandKdoesKnotKposeKsubstantialKriskKforKdermal,Kingestion,Kinhalati
on,KorKexposure.KUncontaminatedKandKroutinelyKcleaned



CategoryK2K-KcorrectKanswer-
waterKcontainsKsignificantKcontaminationKandKhasKtheKpotentialKtoKcauseKdiscomfortKorKsicknessKifKcontact
edKorKconsumedKbyKhumans



CategoryK3K-KcorrectKanswer-
waterKisKgrosslyKcontaminatedKandKcanKcontainKpathogenic,Ktoxigenic,KorKotherKharmfulKagents



SewageKBackKUpK-KcorrectKanswer-CategoryK3



CleanKwaterKsupplyKlineK-KcorrectKanswer-CategoryK1



ClassK1K-KcorrectKanswer-LeastKamountKofKwaterKabsorptionKandKevaporationKloadK-
KWetKporousKmaterialsK-KwaterKlossKisKlessKthenK5%KofKtheKarea

,ClassK2K-KcorrectKanswer-SignificantKamountKofKwaterKabsorptionKandKevaporationKloadK-
KwaterKintrusionKwhereKwetKrepresentsK5%K-K40%KofKtheKarea.




ClassK3K-KcorrectKanswer-
greatestKamountKofKwaterKabsorptionKandKevaporationKload.KWaterKintrusionKwhereKwetKrepresentsKoverK
40%KofKtheKarea



ClassK4K-KcorrectKanswer-
deeplyKheldKorKboundKwater.KSignificantKamountKofKwaterKabsorptionKintoKlowKevaporationKmaterials.KDryi
ngKmayKrequireKspecialKdryingKmethods,KlongerKdryingKtime,KorKsubstantialKwaterKvaporKpressureKdifferenti
als.



ClosedKdryingKsystemK-KcorrectKanswer-
UsesKmechanicalKdehumidificationKandKisKnotKopenKtoKoutsideKair.KUsedKifKthereKareKsecurityKissues,KtheKou
tsideKairKisKnotKconductiveKtoKdryingKorKwhenKaccessKtoKoutsideKairKisKnotKpossible.



ConventualKrefrigerantKdehumidifierK-KcorrectKanswer-
RemovesKwaterKvaporKfromKtheKairKbyKloweringKtheKtemperatureKofKtheKincomingKairKtoKbelowKdewKpointK
andKcausingKtheKwaterKtoKcondenseKonKtheKcoils.KColdKandKhotKsurfacesKcreatedKwithKgasesKinsideKaKclosed
KcoilKsystem.




CombinationKDryingKSystemK-KcorrectKanswer-
usesKsomeKoutdoorKairKwithKdehumidifiersKtoKaccelerateKtheKdryingKprocess.KThisKcanKincludeKperiodicallyK
ventingK(flushing)KtheKstructure,KusingKnegativeKpressureKorKusingKsmallKopeningsKtoKtheKoutside



DesiccantKdehumidifierK-KcorrectKanswer-
RemovesKwaterKvaporKfromKtheKairKthroughKabsorption.KUsuallyKrequiresKmoreKamperageKasKcomparedKtoK
refrigerantKdehumidifier.KDesiccantsKcreateKtheKlowestKvaporKpressureKwhichKworkKbestKonKlowKporosityKm
aterials.KWhenKaKdesiccantKdehuKisKdrawingKoutsideKairKandKductingKprocessedKairKinsideKaKbuildingKitKcanKc
reateKpositiveKpressureKinKtheKbuilding.KToKimproveKdesiccantKdehuKperformance,KitKmayKbeKbeneficialKtoKp
re-coolKtheKdesiccantsKairKintake



InfiltrationK-KcorrectKanswer-
HighKhumidityKoutsideKairKcouldKaffectKtheKdryingKclimateKadverselyKdueKtoK______________

, 1.KTightnessKofKtheKbuildingKenvelope

2.KPrevailingKweather

3.KHVAC

4.KClassKofKWater

5.KBuildingKConstruction

5.KBuildKoutKdensityK-KcorrectKanswer-FavorsKthatKaffectKtheKdetailedKdehumidifierKcalculationKis:



DetailedKDehumidificationKCalculationK-KcorrectKanswer-SeeKChart:K

CubicKFeetK:KDividedKbyK70K=KBaseKPintsKperKday

MultiplyKtheK5KmultipliersKtogether:KBuildKoutKdensityKxKbuildingKconstructionKxKclassKofKwaterKxKHVACKxKW
eatherKImpactK=KMultiplier

MultiplyKBaseKPintsKperKdayKxKMultiplierK=KAdjustedKPintsKPerKDay



DryKStandardsK-KcorrectKanswer-
TheKunaffectedKmaterialKreadingsKareKcalledK______K______.KYouKknowKyouKcanKuseKthisKasKyourKdryingKgo
al.KYourKdryingKgoalKisKthisKplusK10%KofKit.



DryingKGoalKCalculationK-KcorrectKanswer-DryKstandardK+K(DryKstandardKxK10%)K=K____________________



WhyKdoesKdemolitionKoccurK-KcorrectKanswer-1.KRemovingKMaterialsKtoKeliminateKsafetyKhazards

2.KRemovingKmaterialsKthatKhaveKsufferedKprimaryKdamageKandKareKnotKrestorable

3.KRemovingKporousKmaterialsKthatKareKholdingKodor

5.KRemovingKvaporKbarriersKtoKassistKwithKdryingKefforts

6.KRemovingKmaterialsKtoKreduceKdryingKtime

7.KRemovingKmaterialsKtoKopenKcavitiesKorKareasKtoKprovideKadditionalKneededKservices



UsefulKforKadjuster,KorKnotesKonKxactimateKlineKitems



RecommendationKCalculationK-KcorrectKanswer-StepK1:KInstallKOneKairKmoverKinKeachKaffectedKRoom

StepK2:KAddKoneKairKmoverKforKeveryK50-70KsquareKfeetKofKaffectedKwetKfloorKinKeachKroom