ASTM_D_4869_-_D_4869M_-_16a_2021.pdf

Designation:D4869/D4869M16a(Reapproved 2021)Standard Specification forAsphalt-Saturated Organic Felt Underlayment Used in SteepSlope Roofing1This standard is issued under the fixed designation D4869/D4869M;the number immediately following the designation indicates theyear of original adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of lastreapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This specification covers asphalt-saturated organic feltfor use as an underlayment with steep slope roofing.1.2 The objective of this specification is to provide afinished product that will lie flat and resist wrinkling,puckering,and shrinking when left exposed to the sun,rain,frost,or dew for a period of two weeks after application.1.3 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard.The values stated ineach system may not be exact equivalents;therefore,eachsystem shall be used independently of the other.Combiningvalues from the two systems may result in nonconformancewith the standard.1.4 The following safety hazards caveat pertains only to thetest method portion,Section 8,of this specification:Thisstandard does not purport to address all of the safety concerns,if any,associated with its use.It is the responsibility of the userof this standard to establish appropriate safety,health,andenvironmental practices and determine the applicability ofregulatory limitations prior to use.1.5 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D70 Test Method for Density of Semi-Solid Asphalt Binder(Pycnometer Method)D146/D146M Test Methods for Sampling and TestingBitumen-Saturated Felts and Woven Fabrics for Roofingand WaterproofingD1079 Terminology Relating to Roofing and WaterproofingD1922 Test Method for Propagation Tear Resistance ofPlastic Film and Thin Sheeting by Pendulum MethodD6136/D6136M Test Method for Kerosine Number of Un-saturated(Dry)Felt by Vacuum MethodF1087 Test Method for Linear Dimensional Stability of aGasket Material to Moisture3.Terminology3.1 DefinitionsFor definitions of terms used in thisspecification,refer to Terminology D1079.4.Classification4.1 Asphalt-saturated felts covered by this specification areof four types:4.1.1 Type I#8 underlayment,4.1.2 Type II#13 underlayment,4.1.3 Type III#20 underlayment,and4.1.4 Type IV#26 underlayment.5.Materials and Manufacture5.1 In the process of manufacture,a single thickness oforganic dry felt shall be uniformly saturated with an asphalticsaturant.5.2 The felt shall be produced principally from organicfibers.The surface of the felt shall be uniform and relativelysmooth.Upon splitting or tearing on the bias,the felt shallappear free of lumps or particles of foreign substances.6.Physical Requirements6.1 The material shall conform to the physical requirementsin accordance with Table 1 and the dimensions and masses inaccordance with Table 2.6.2 The finished product shall not crack nor be so sticky asto cause tearing or other damage upon being unrolled attemperatures between 0 and 60 C 32 and 140 F.6.3 The finished product shall pass the water shower expo-sure test in accordance with 8.6,indicating resistance to liquidwater transmission.1This specification is under the jurisdiction of ASTM Committee D08 onRoofing and Waterproofing and is the direct responsibility of Subcommittee D08.02on Steep Roofing Products and Assemblies.Current edition approved Jan.1,2021.Published January 2021.Originallyapproved in 2002.Last previous edition approved in 2016 as D4869/D4869M 16a.DOI:10.1520/D4869_D4869M-16AR21.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.17.Workmanship,Finish,and Appearance7.1 The felt shall be thoroughly and uniformly saturated,and shall show no unsaturated spots at any point upon cutting50 mm 2 in.wide strips at random across the entire sheet andsplitting them open for their full length.7.2 The saturated felt may be surfaced lightly on one sidewith talc or other finely comminuted mineral material topr