ASTM_D_4601_-_D_4601M_-_04_2020.pdf

Designation:D4601/D4601M04(Reapproved 2020)Standard Specification forAsphalt-Coated Glass Fiber Base Sheet Used in Roofing1This standard is issued under the fixed designation D4601/D4601M;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 impregnated andcoated glass fiber base sheet,with or without perforations,foruse as the first ply of the built-up roofing.When not perforated,this sheet is suitable for use as a vapor retarder,with a solidmopping of asphaltic material,under roof insulation or be-tween multiple layers of roof insulation.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 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 Waterproofing3.Terminology3.1 DefinitionsFor definitions of terms used in thisspecification,refer to Terminology D1079.4.Classification4.1 Asphalt impregnated and coated glass fiber base sheet,Type I and Type II,are covered by this specification.5.Materials and Manufacture5.1 The mat shall be a thin,porous mat of uniformlydistributed glass fibers,with or without additional reinforcingstrands of glass yarn,and bonded with a water-resistantresinous binder.5.2 In the process of manufacture,a single thickness of glassfiber mat shall be impregnated with hot asphalt,coated on oneor both sides with a hot asphaltic material,and permitted to besurfaced with mineral surfacing.5.3 The impregnating and coating material shall be a hot-applied asphalt permitted to be compounded with a mineralstabilizer.5.4 The base sheet may be faced with a kraft paper on thebottom side.6.Physical Requirements,Dimensions,and Masses6.1 The material shall conform to the physical requirements,dimensions,and masses described in Tables 1 and 2.It mayhave small pin holes throughout the sheet.6.2 Perforated material shall conform to the physicalrequirements,dimensions,and masses described in Tables 1-3.It may have small pin holes throughout the sheet.6.3 The finished product shall not crack nor be so sticky asto cause tearing or other damage upon being unrolled attemperatures between 4 and 60 C 40 and 140 F.7.Workmanship,Finish,and Appearance7.1 The finished material shall be uniformly impregnatedand coated with asphalt.It shall be free of visible defects suchas holes,ragged or untrue edges,breaks,cracks,tears,andprotrusions.This is not to exclude perforations for the specificpurpose of providing for venting of gases during application orsmall pin holes.8.Sampling and Test Methods8.1 Sample the material and determine the properties de-scribed in this specification in accordance with Test MethodsD228/D228M unless otherwise indicated.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 1986.Last previous edition approved in 2012 as D4601/D4601M 04(2012).DOI:10.1520/D4601_D4601M-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.8.2 Breaking StrengthDetermine in accordance with TestMethods D146/D146M,Section 13.(Specimens must be freefrom perforations.)8.3 Moisture ContentDetermine in