Designation:D6904−03(Reapproved2022)StandardPracticeforResistancetoWind-DrivenRainforExteriorCoatingsAppliedonMasonry1ThisstandardisissuedunderthefixeddesignationD6904;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thispracticeisfortheevaluationoftheabilityofcoatingstoresistthepassageofwaterthroughmasonryblockwhenexposedtowatersprayandairpressure.1.2Thevaluesstatedininch-poundunitsaretoberegardedasstandard.ThevaluesgiveninparenthesesaremathematicalconversionstoSIunitsthatareprovidedforinformationonlyandarenotconsideredstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.4Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2D1475TestMethodforDensityofLiquidCoatings,Inks,andRelatedProductsD3924SpecificationforStandardEnvironmentforCondi-tioningandTestingPaint,Varnish,Lacquer,andRelatedMaterialsD3925PracticeforSamplingLiquidPaintsandRelatedPigmentedCoatings2.2FederalStandard:3TT-C-555BCoating,Textured(ForInteriorandExteriorMasonrySurfaces)3.SummaryofPractice3.1Typically8by16by2in.masonryblocksarecoatedwithblockfillerandthencoatedwiththemasonrypaintandallowedtocure.Thecoatedblocksarethensecuredtoatestapparatusandexposedfor24htocontinuouswatersprayandairpressureorasagreeduponbetweenmanufacturerandsupplier.Uponcompletionoftheexposure,theblocksareremoved,evaluatedforvisiblewaterl...
