ASTM_D_2626_-_D_2626M_-_04_2012e1.pdf

Designation:D2626/D2626M04(Reapproved 2012)1Standard 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 Department of Defense.1NOTEUnits information was editorially corrected in June 2012.1.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 non-conformancewith the standard.2.Referenced Documents2.1 ASTM Standards:2D146 Test Methods for Sampling and Testing Bitumen-Saturated Felts and Woven Fabrics for Roofing andWaterproofingD226 Specification for Asphalt-Saturated Organic Felt Usedin Roofing and WaterproofingD228 Test Methods for Sampling,Testing,and Analysis ofAsphalt Roll Roofing,Cap Sheets,and Shingles Used inRoofing and WaterproofingD1079 Terminology Relating to Roofing and WaterproofingE96/E96M Test Methods for Water Vapor Transmission ofMaterials3.Terminology3.1 DefinitionsFor definitions of terms used in this speci-fication,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 Table 2 and Table 3.Perforated base sheets shallconform to the same requirements as the plain type but shallalso have uniformly 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 60C 50 and 140F.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 1,2012.Published June 2012.Originallyapproved in 1967.Last previous edition approved in 2004 as D2626 04.DOI:10.1520/D2626_D2626M-04R12E01.2For 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 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 across the entire width ofthe sheet and splitting them open for their full length.7.2 The coating shall be applied uniformly on both sides ofthe sheet in a continuous,unbroken film that extends to theedges of the sheet.The coating may be smooth or finely veined,but not coarsely veined.7.3 The mineral surfacing shall be applied uniformly overthe entire surface of the top side of the sheet.If soap or othermaterial is used on the reverse side of the sheet,the amountapplied shall not be so great as to interfere with adhesionbetween the base sheet and plying cement.Coarse mica shallnot be used