b'TECHNICAL & RESEARCH Continued from page 9aresusceptibletowobble,becomingUse of fleece backing or self-adheringMEMBRANE INSTALLATION ISSUESloose or even backing out of the deck. membranes Rooftop Staging/Loading PointsFasteners and plates too close the edgesThe hail rating desired Rooftoploadingaccesspointsarean of insulation boards or too far into theThe intended overburden designed forimportantareatoobserveclosely.Onsome boards from the edge of the boards, asthe system, if any commercial roofing projects, there can be other comparedtotheroofmanufacturersTheroofassemblyandattachmenttrades accessing the roof and loading materials requirements. method and debris onto and off the roof. In many cases, Fasteners that are bent or driven at anBudget constraints for the project these trades use the same ground-level staging angle to the roof surface. Fasteners mustVisual appearance if the roof is visibleareas used by the roofing contractor because be driven in perpendicular to the rooffromotherpartsofthebuildingorthose areas are conveniently located relative to surface.Angledorloosefastenersandadjacent buildings the location of the jobsite crane or material lift fasteners that are not fully seated or over- Fire rating/UL classification required (see Fig. 10).driven must be replaced or corrected per the manufacturers specifications.Fasteningpatternsthatdonotmeet requirementsintheSPRI,FM,or ASCE 7 standards.MEMBRANE SELECTIONThemostcommonthermoplasticsin-gle-plymembranetypesareTPOperExperienced Counsel and ASTMD6878,StandardSpecificationfor Thermoplastic Polyolefin Based Sheet Roofing 3 ; polyvinyl chloride (PVC) per ASTM D4434,Determined ProfessionalsStandard Specification for Poly(Vinyl Chloride) Sheet Roofing 4 ; and ketone ethylene ester (KEE) PVC per ASTM D6754, Standard Specification for Ketone Ethylene Ester Based Sheet Roofing. 5Most thermoplastic membrane sheets are available in several thicknesses such as 45 mil,Attorneys 50 mil, 60 mil, and 80 mil; even thicker mem-branesareavailablewhenfleeceorother OSHA Defense You Can similar materials are laminated the underside of the membrane. Labor & Employment Rely On for Thermoplastic membrane sheets are inter- Lawnally reinforced. Formable flashing is generally Construction Law Effective not reinforced so that it can be molded to fit penetrations, inside and outside corners, pitch Business Law Representationpans, and complex penetrations such as angle iron or I-beams.LitigationThe sheets typically come in white, which isveryreflectiveand,inmostcases,meets Workers Comp DefenseStephen A. WatringthereflectivitycriteriadefinedbytheCoolGary W. AumanRoof Rating Council (CRRC) Product Rating Program Model 6 ; ANSI/CRRC S100, StandardWilliam H. Barney, IIITestMethodsforDeterminingRadiativeRichard L. Carr, Jr.PropertiesofMaterials 7 ;EnergyStar 8 ;andDonald B. RineerLEED. 9 Amy C. MitchellThese membranes also come in other stan-dard, regularly manufactured colors, includingDouglas S. Jenkstan and gray. Custom colors can be ordered;Abigail K. Whitecheck with the roof manufacturer for the min- David M. Rickertimumorderquantity.Reflectivityratingsby color may vary by manufacturer. 937-223-6003 Matthew J. BakotaAlongwithmembranethicknessand reflectivity, the following are other factors toamfdayton.comconsiderwhenselectingmembraneproducts for a project:Width of the sheets10 www.mrca.orgMidwest Roofer39'