ASTM_D_1970_-_D_1970M_-_21.pdf

Designation:D1970/D1970M21Standard Specification forSelf-Adhering Polymer Modified Bituminous Sheet MaterialsUsed as Steep Roofing Underlayment for Ice DamProtection1This standard is issued under the fixed designation D1970/D1970M;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 polymer modified bituminoussheet materials intended for use as underlayment on roof eaves,or valleys,or both,to prevent leakage of shingle,tile,or metalroofs from water back-up due to ice dams.1.2 These underlayment sheets have a sticky adhesive layerwhich is exposed by removal of a protective sheet.The topsurface is suitable to work on during the application of theexposed roofing.1.3 Table of Contents:SectionScope1Referenced Documents2Terminology3Workmanship,Finish,and Appearance4Physical Requirements5Sampling6Test Methods7Conditioning7.1Thickness7.2Maximum Load and Elongation at Break7.3Adhesion to Plywood7.4Thermal Stability7.5Flexibility at 29 C 20 F7.6Tear Resistance7.7Moisture Vapor Permeability7.8Capability to Seal Around Nail(Head of Water Test)7.9Waterproof Integrity of Side Lap Seam(Head of Water Test)7.10Inspection8Rejection and Rehearing9Packaging and Package Marking10Keywords111.4 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.1.5 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.6 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:2D228/D228M Test Methods for Sampling,Testing,andAnalysis of Asphalt Roll Roofing,Cap Sheets,andShingles Used in Roofing and WaterproofingD903 Test Method for Peel or Stripping Strength of Adhe-sive BondsD1079 Terminology Relating to Roofing and WaterproofingD1204 Test Method for Linear Dimensional Changes ofNonrigid Thermoplastic Sheeting or Film at ElevatedTemperatureD4073/D4073M Test Method for Tensile-Tear Strength ofBituminous Roofing MembranesD5147/D5147M Test Methods for Sampling and TestingModified Bituminous Sheet MaterialD7349/D7349M Test Method for Determining the Capabil-ity of Roofing and Waterproofing Materials to SealAround FastenersE96/E96M Test Methods for Water Vapor Transmission ofMaterials3.Terminology3.1 DefinitionsFor definitions of terms used in thisspecification,refer to Terminology D1079.1This 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 May 1,2021.Published June 2021.Originallyapproved in 1990.Last previous edition approved in 2020 as D1970/D1970M 20.DOI:10.1520/D1970_D1970M-21.2For 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.13.2 Definitions of Terms Specific to This Standard:3.2.1 lotfor the purpose of sampling,a lot shall consist ofall material manufactured in one production run(not to exceed24 h)using the same source of raw materials.4.Workmanship,Finish,and Appearance4.1 The underlayment sheet shall be supplied in roll form.4.2 The underlayment sheet shall be substantially uniformin thickness and appearance.It shall be free of visible defectssuch as holes,ragged or untrue edges,breaks,cracks,tears,protuberances,and indentations,except for those perforationsor protuberances which are intentional.4.3 The surface of the underlayment sheet shall be designedto provide traction and slip resistance to the applicator.NOTE1The intent of 4.3 is to