1、Designation:D6705/D6705M04(Reapproved 2018)Standard Guide forRepair and Recoat of Spray Polyurethane Foam RoofingSystems1This standard is issued under the fixed designation D6705/D6705M;the number immediately following the designation indicates theyear of original adoption or,in the case of revision
2、,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 guide covers the procedures for the repair andrecoating of existing spray polyurethane roofing systems.1.
3、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 st
4、andard.1.3 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 u
5、se.1.4 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
6、to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2C1029 Specification for Spray-Applied Rigid Cellular Poly-urethane Thermal InsulationD5469/D5469M Guide for Application of New Spray Ap-plied Polyurethane Foam and Coated Roofing SystemsD6083 Specification for Liquid Applied Acrylic Co
7、atingUsed in Roofing(Withdrawn 2014)32.2 SPFA Standards:4AY 102 A Guide for Selection of Elastomeric ProtectiveCoatings Over Sprayed Polyurethane FoamAY 107 Spray Polyurethane Foam Blisters,Their Causes,Types,Prevention and Repair2.3 CPI Standard:5Center for The Polyurethane Industry(CPI),Bulletin A
8、X119 Guide for Safe Handling and Use of Polyurethaneand Polyisocyanurate Foam Systems3.Terminology3.1 Definitions:3.1.1 recoatto apply a new protective coating over anexisting coated SPF(spray polyurethane foam)roof system toextend the performance life of the roofing system.3.1.2 scarfingto shave or
9、 grind an SPF foam surfacemechanically to remove a coating,or UV deteriorated SPF,orboth,to refoam or recoat the surface.4.Significance and Use4.1 This guide outlines general procedures and precautionsnecessary for correct and safe repair and recoat of SPF roofingsystems.4.2 This guide is not all in
10、clusive;this guide is intended tosupplement detailed instructions from manufacturers andsafety requirements required by law.5.Roof Inspection Procedures and Considerations5.1 General Considerations:5.1.1 The performance of a sprayed-in-place polyurethanefoam roof system can be affected by all the co
11、mponent parts ofthe roof structure,as well as the atmospheric conditions insideand outside the structure.Structural design,code compliance,specification review,contractor,and material selection shouldbe considered in the repair and recoat of a spray polyurethanefoam roof system.1This guide is under
12、the jurisdiction of ASTM Committee D08 on Roofing andWaterproofing and is the direct responsibility of Subcommittee D08.06 on SprayPolyurethane Foam Roof Systems.Current edition approved Jan.1,2018.Published January 2018.Originallyapproved in 2001.Last previous edition approved in 2011 as D6705/D670
13、5M 04(2011)1.DOI:10.1520/D6705_D6705M-04R18.2For 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.3The last approved ver
14、sion of this historical standard is referenced onwww.astm.org.4Available from Spray Polyurethane Foam Alliance,4400 Fair Lakes Ct.,Suite105,Fairfax,VA 22033.5Available from The Center for the Polyurethanes Industry,1300 Wilson Blvd.,Arlington,VA 22209.Copyright ASTM International,100 Barr Harbor Dri
15、ve,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
16、by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 5.1.2 A range of spray polyurethane foam systems existswith various physical properties,exhibiting different tempera-ture limitations,and different combustibility characteristics.Most published data are obtained from testing of laboratorysamples.The thickness of the polyurethane foam sprayed,number of passes,temperature of substrate,ambienttemperature,and so forth will have an effect on all polyure-thane foam properties.