ASTM_D_6705_-_D_6705M_-_04_2011e1.pdf

Designation:D6705/D6705M04(Reapproved 2011)1Standard 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,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.1NOTEUnits information and the referenced CPI document were editorially revised in June 2011.1.Scope1.1 This guide covers the procedures for the repair andrecoating of existing spray polyurethane roofing systems.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.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 and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2C1029 Specification for Spray-Applied Rigid Cellular Poly-urethane Thermal InsulationD5469 Guide for Application of New Spray Applied Poly-urethane Foam and Coated Roofing SystemsD6083 Specification for Liquid Applied Acrylic CoatingUsed in Roofing2.2 SPFA Standards:3AY 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:4Center for The Polyurethane Industry(CPI),Bulletin AX119 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 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 inclusive;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 component 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.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,1This guide is under 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 May 1,2011.Published June 2011.Originallyapproved in 2001.Last previous edition approved in 2004 as D6705 04.DOI:10.1520/D6705_D6705M-04R11E01.2For 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.3Available from Spray Polyurethane Foam Alliance,4400 Fair Lakes Ct.,Suite105,Fairfax,VA 22033.4Available from The Center for the Polyurethanes Industry,1300 Wilson Blvd.,Arlington,VA 22209.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 number of passes,temperature of substrate,ambient tempera-ture,and so forth will have an effect on all polyurethane foamproperties.5.1.3 The specifier should consult with the respective ma-terial manufacturer of the sprayed-in-place polyurethane foamroof system.This should include,but not be limited to,materials selection,expansion joints,flashing details,and otheritems.5.2 Inspection:5.2.1 The preparation for the repair and recoat of a sprayed-in-place polyurethane foam roof system will vary according tothe conditions of the roof and its component parts and the typeof existing protective coating used over the polyurethane foam.5.2.2 Conduct a roof inspection to determine the repairs tobe performed and the type of materials to be used.5.3 Visual Inspection:5.3.1 Look for blisters or delaminated a