ASTM_D_2626_-_D_2626M_-_04_2020.pdf

Designation:D2626/D2626M04(Reapproved 2020)Standard Specification forAsphalt-Saturated and Coated Organic Felt Base SheetUsed in Roofing1This standard is issued under the fixed designation D2626/D2626M;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.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope1.1 This specification covers asphalt-saturated and coatedorganic felt base sheet with mineral surfacing on the top side,with or without perforations,for use as the first ply of abuilt-up roof.When not perforated,this sheet is suitable for useas a vapor retarder,with a solid mopping of asphaltic material,under roof insulation or between multiple layers of roofinsulation.1.2 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.1.3 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:2D146/D146M Test Methods for Sampling and TestingBitumen-Saturated Felts and Woven Fabrics for Roofingand WaterproofingD226/D226M Specification for Asphalt-Saturated OrganicFelt Used in Roofing and WaterproofingD228/D228M Test Methods for Sampling,Testing,andAnalysis of Asphalt Roll Roofing,Cap Sheets,andShingles Used in Roofing and WaterproofingD1079 Terminology Relating to Roofing and WaterproofingE96/E96M Test Methods for Water Vapor Transmission ofMaterials3.Terminology3.1 DefinitionsFor definitions of terms used in thisspecification,refer to Terminology D1079.3.2 Definitions of Terms Specific to This Standard:3.2.1 lotfor the purpose of sampling,a lot shall consist ofall material of the same type and size offered for delivery at onetime.4.Materials and Manufacture4.1 In the process of manufacture,a single thickness of dryorganic felt shall be saturated with hot asphalt,coated on bothsides with a hot asphaltic material,and surfaced on the top sidewith mineral surfacing.4.2 The felt shall be produced principally from organicfibers,or mixtures thereof.The surface of the felt shall beuniform and relatively smooth.Upon splitting or tearing on thebias,the felt shall appear reasonably free of lumps and particlesof foreign substances.4.3 The coating shall be a hot-applied asphalt materialpermitted to be compounded with a mineral stabilizer.4.4 The reverse side of the base sheet may be covered witha suitable material to prevent sticking in the roll.5.Physical Properties5.1 The material shall conform to the physical requirementsprescribed in Table 1 and the dimensions and masses pre-scribed in Tables 2 and 3.Perforated base sheets shall conformto the same requirements as the plain type but shall also haveuniformly spaced perforations.5.2 The finished product shall not crack nor be so sticky asto cause tearing or other damage upon being unrolled attemperatures between 10 and 60 C 50 and 140 F.6.Dimensions,Mass,and Permissible Variations6.1 The material shall conform to the dimensions andmasses prescribed in Table 2.1This specification is under the jurisdiction of ASTM Committee D08 onRoofing and Waterproofing and is the direct responsibility of Subcommittee D08.04on Felts,Fabrics and Bituminous Sheet Materials.Current edition approved May 1,2020.Published May 2020.Originallyapproved in 1967.Last previous edition approved in 2012 as D2626/D2626M 04(2012).DOI:10.1520/D2626_D2626M-04R20.2For 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.6.2 Perforated material shall also conform to the dimensionsand other requirements prescribed in Table 3.7.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 acr