ASTM_D_6510_-_00.pdf

Designation:D 6510 00Standard Guide forSelection of Asphalt Used in Built-Up Roofing Systems1This standard is issued under the fixed designation D 6510;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon(e)indicates an editorial change since the last revision or reapproval.1.Scope1.1 The purpose of this guide is to provide advice for theselection of asphalt used in the construction of built-up roofing(BUR).This guide does not address the use of asphalt inwaterproofing,cold-applied,or modified bituminous roofing.1.2 Reinforcements considered for use with roofing asphaltinclude ply sheets,(see Specifications D 226,D 2178,andD 5726),base sheets(see Specifications D 2626,D 4601,andD 4897),and cap sheets(see Specification D 3909).Theyconsist of glass,organic,or synthetic fibers.1.3 The use of asphalt in the placement of vapor retardersand rigid roof insulation also is addressed.2.Referenced Documents2.1 ASTM Standards:D 92 Test Method for Flash and Fire Points by ClevelandOpen Cup2D 226 Specification for Asphalt-Saturated Organic FeltUsed in Roofing and Waterproofing3D 312 Specification for Asphalt Used in Roofing3D 1079 Terminology Relating to Roofing,Waterproofing,and Bituminous Materials3D 1863 Specification for Mineral Aggregate Used inBuilt-Up Roofs3D 2178 Specification for Asphalt Glass Felt Used in Roof-ing and Waterproofing3D 2626 Specification for Asphalt-Saturated and Coated Or-ganic Felt Base Sheet Used in Roofing3D 3791 Practice Evaluating the Effects of Heat onAsphalts3D 3909 Specification for Asphalt Roll Roofing(Glass Felt)Surfaced with Mineral Granules3D 4601 Specification for Asphalt-Coated Glass Fiber BaseSheet Used in Roofing3D 4897 Specification for Asphalt-Coated Glass-Fiber Vent-ing Base Sheet Used in Roofing3D 5726 Specification for Thermoplastic Fabrics Used inHot-Applied Roofing and Waterproofing33.Terminology3.1 DefinitionsFor definitions of terms used in this guide,see Terminology D 1079.3.2 For a discussion of EVT,refer to NRCA Bulletin 2-91(or the current edition of the NRCARoofing and WaterproofingManual).44.Significance and Use4.1 This guide supersedes the slope guidelines of AppendixX1 of Specification D 312.4.2 Hot-applied roofing asphalt serves both as the water-proofing agent and adhesive for construction of built-uproofing membranes.There are many variables that may affectthe performance of BUR membranes.This guide providesgeneral specification guidelines for the asphalt only.5.General Considerations5.1 DurabilitySpecification D 312 describes four types ofasphalt.In general,the softest(least oxidized)asphalt isconsidered most durable.The accepted rule is to select thesoftest bitumen commensurate with the slope,consistent withthe other variables.5.2 When the EVT guidelines are followed the asphaltapplication rate can be expected to fall within the ranges of 1.0to 2.0 kg/m2(20 to 40 lb/100 ft2).5.3 Table 1 provides general recommendations for the useof the various types of Specification D 312 asphalt.5.3.1 In hotter climates,harder(higher viscosity)bitumensare chosen to minimize slippage potential.Table 2 providessome general guidance for proper asphalt selection wheneversolar exposure is considered.5.4 Recommended slope guidelines for the respectiveSpecification D 312 asphalts are as follows:5.4.1 Type I asphalts are relatively susceptible to flow.Theygenerally are used in aggregate-surfaced roofs on inclines up to2%(14in./ft)slope.5.4.2 Type II asphalts are moderately susceptible to flow atroof temperatures.They are sometimes used in built-up roofconstruction on inclines from approximately 2%(14in./ft)slope to 8.3%(1 in./ft)slope.5.4.3 Type III asphalts are relatively nonsusceptible to flow.They are used in built-up roof construction on inclines from1This guide is under the jurisdiction of ASTM Committee D-8 on Roofing,Waterproofing,and Bituminous Materials and is the direct responsibility ofSubcommittee D08.20 on Roofing Membrane Systems.Current edition approved Jan.10,2000.Published March 2000.2Annual Book of ASTM Standards,Vol 05.01.3Annual Book of ASTM Standards,Vol 04.04.4NRCA Roofing and Waterproofing Manual,Current Edition,Use of EVT(orNRCABulletin 291),available from the National Roofing ContractorsAssociation,Rosemont,IL.1Copyright ASTM,100 Barr Harbor Drive,West Conshohocken,PA 19428-2959,United States.approximately 2%(14in./ft)slope to 25%(3 in./ft)slope.They are also used in vertical flashings when the flashings aretop-nailed to resist slippage.5.4.4 Type IV asphalts generally are nonsusceptible to flow.They are used in built-up roof construction on inclines fromapproximately 2%(14in./ft)slope to 50%(6 in./ft)slope.They also are used in vertical flashings when the flashings aretop-nailed to resist slippage.These asphalts are useful in areaswhere relatively high year-round temperatures are experie