1、Designation:D8257/D8257M22Standard Specification forMechanically Attached Polymeric Roof Underlayment Usedin Steep Slope Roofing1This standard is issued under the fixed designation D8257/D8257M;the number immediately following the designation indicates theyear of original adoption or,in the case of
2、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 addresses mechanically attachedpolymeric roof underlayment used in steep slope roof
3、ing.1.2 The objective of this specification is to provide afinished product that will be used as a water-shedding under-layment layer on steep sloped roofs prior to and after installa-tion of the primary roof covering.1.3 The values stated in either SI units or inch-pound unitsare to be regarded sep
4、arately 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 This standard does not purport to address all of thesafety concerns,if
5、 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.1.5 This international standard was developed in accor-dance with internationa
6、lly 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
7、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 WaterproofingD751 Test Methods for Coated FabricsD1079 Terminology Relatin
8、g to Roofing and WaterproofingD1204 Test Method for Linear Dimensional Changes ofNonrigid Thermoplastic Sheeting or Film at ElevatedTemperatureD4533/D4533M TestMethodforTrapezoidTearingStrength of GeotextilesD4798/D4798M Practice for Accelerated Weathering TestConditions and Procedures for Bituminou
9、s Materials(Xenon-Arc Method)D4869/D4869M Specification for Asphalt-Saturated Or-ganic Felt Underlayment Used in Steep Slope RoofingD5035 Test Method for Breaking Force and Elongation ofTextile Fabrics(Strip Method)E96/E96M Test Methods for Gravimetric Determination ofWater Vapor Transmission Rate o
10、f MaterialsF1667 Specification for Driven Fasteners:Nails,Spikes,andStaplesG113 Terminology Relating to Natural and Artificial Weath-ering Tests of Nonmetallic MaterialsG151 Practice for Exposing Nonmetallic Materials inAccel-erated Test Devices that Use Laboratory Light SourcesG155 Practice for Ope
11、rating XenonArc LampApparatus forExposure of Materials3.Terminology3.1 DefinitionsFor definitions of terms used in thisspecification,refer to Terminologies D1079 and G113.3.2 Definitions of Terms Specific to This Standard:3.2.1 polymeric roof underlaymenta sheet material pri-marily composed of one o
12、r more synthetic polymers for use asa secondary water-shedding layer on steep sloped roofs wheninstalled below the primary roof covering.3.2.1.1 DiscussionExamplesincludepolyethylene,polypropylene,or polyethylene terephthalate.4.Workmanship,Finish,and Appearance4.1 The polymeric roof underlayment sh
13、all be supplied inroll form.4.2 The polymeric roof underlayment shall be uniform inthickness and appearance.It shall be free of visible defects1This specification is under the jurisdiction of ASTM Committee D08 onRoofing and Waterproofing and is the direct responsibility of Subcommittee D08.02on Ste
14、ep Roofing Products and Assemblies.Current edition approved Feb.1,2022.Published February 2022.Originallyapproved in 2020.Last previous edition approved in 2020 as D8257/D8257M 20.DOI:10.1520/D8257_D8257M-22.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer S
15、ervice 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 accor
16、dance 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.1such as holes,ragged or untrue edges,breaks,cracks,tears,andprotruding edges of reinforcement.4.3 The surface of the underlayment sheet shall be designedto provide traction and slip resistance to the applicator.NOTE1The intent of 4.3 i
