ASTM_D_1970_-_D_1970M_-_15a.pdf

Designation:D1970/D1970M15aStandard 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 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 non-conformancewith the standard.1.4 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 and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D228 Test Methods for Sampling,Testing,and Analysis ofAsphalt Roll Roofing,Cap Sheets,and Shingles Used inRoofing 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 ElevatedTemperatureD2523 Practice for Testing Load-Strain Properties of Roof-ing MembranesD4073 Test Method for Tensile-Tear Strength of BituminousRoofing MembranesD5147 Test Methods for Sampling and Testing ModifiedBituminous Sheet MaterialD7349 Test Method for Determining the Capability of Roof-ing and Waterproofing Materials to Seal around FastenersE96/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 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 recognize that surface slipperiness isimportant when working on a roof and,while no test method is specifiedin this standard,several methods for assessing the relative slipperiness ofsurfaces are available.It is the further intent of this paragraph to ensurethat,whatever method is used,the friction coefficient or resistance toslipping of the surface of these products should be at least as great asasphalt-saturated felt shingle underlayment tested under the same condi-tions of temperature and wetness as agreed between purchaser and seller.4.4 Sheet sections shall be suitable for joining by themanufacturers recommended procedure.The entire lower1This 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 June 15,2015.Published July 2015.Originallyapproved in 1990.Last previous edition approved in 2015 as D1970/D1970M 15.DOI:10.1520/D1970_D1970M-15A.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 States1 surface of the underlayment sheet shall be capable of beingfully adhered to the roof deck.5.Physical Requirements5.1 The underlayment sheet shall conform to the physicalrequirements prescribed in Table 1.5.2 The underlayment sheet shall not crack nor be so stickyas to cause tearing or other damage upon being unrolled atmaterial temperatures between 4.4 and 60C 40 and 140F.6.Sampling6.1 From each lot of underlayment sheet,select sample rollsin accordance with T