b'betteronthemorestable1. Asphalt Emulsions (e.g.,roofsallowscomparisonofthe ASTM fiberglassreinforcedmem D:coatings\'per when 1227) formance brane substrate.a. Aluminumpigmented,appliedover primer, andwhen Besidestestingthecoat fibered asphalt emulsion;applied directly to the membranes. ings over fiberglass vs. b.dioxide pigmented,DuringtheInitialCoordination poly Titanium ester reinforced APP polymerfibered asphalt emulsion;Meetingwiththeparticipating modifiedasphaltmem c. Black (non-pigmented) clay man andcontractors, ufacturers branes,isstudy isbased asph t.prior to the commen of the th coatingsal emulsion cement also examin the coatings\'2. Solvent-basedAsphaltCoat fieldwork, ii was decided that the ing performance over two differ ings (e.g., ASTM Dmaterialtobeu asprimer 2824):sed ent "grades"APP modifieda. Premium-grade, aluminumwouldbeclay- andwaterof-based pigmented(e.g.,-2-1/2lb.asphaltemulsion.This decision paste}, fibered asphalt coat waspartia y due to the environlling;mentalemphasisthatseveral b. Commodity-grade,alu states are puttingforth r ng egardiminumpigmented (e.g.,-1limiting the useof solvent-based lb.paste),fiberedasphaltproducts. Also,insomemem~.coating.brane-to-coating interface config,-3. Acrylic/Latex, White Pigmentedurations,itishypothesizedthatGranule-surfacedstyreneRoof Coatings:asphalt emulsioncanserve asa butadienestyrene(SBS}a. Premium-grade,whitepig better divorcinglayer toseparate polymer modified asphaltmented latex coating;the m from the coating. embrane membranes.b. Commodity-grade white pigTogathermorebroad mented latex coating.Some Preliminary basedperformanceandD. SEBS and SBS Polymer Modi Weathering Results weatheringexperiencedata,fied,Solvent-basedAsphaltAti-page technical paper mul on twodifferenttypesofAPPRoof Coatings:therch findings will be presea reQualitymodiandSBSpolymer modified1.SEBS polymersented at the 12th Conference on asphalt roof membranes arefied,solvent-based,alu Roofing Technology,September being examined in this proj minumpigmented,fibered25-27, 2002 inea Vista, Lak Buenect. The differences betweenasphalt coating;Fla.Somepreliminaryfindings thetwotypesofSBSmodifiedasphalt membranes.Commodity 2. Quality SBSpolymermodi wererecentlypr tothe esented asphalt membranes are that one isgrade and commercial-grade APPfied,solvent-based, alu roofingindustryduringMRCA\'s polyester reinforced, and the otherpolymermodifiedasph mem minumpigmented,fiberedConven inNashville,Tenalttion isfiberglassreinforced.Bothofbranesarebeingcomparedforasphalt co nessee. ating. thesetwodifferentlyreinforcedperformancedifferences,bothinSomeofthemoreprofound membranes were testedbecausethe areas of the testserveControl and Primed Areasfindings revealed to date are as folroofs that glass-fiber reinforced membranesas anu area,andWhineachofthe separatelows: ncoated/controlitarethought toprovidea morein the areas where a ofdiffer membrane roofed areas, a1.All of the coatings a providlltheportionre thermally stable substrate for theent coatings have been applied toof the membranelefting weather-shielding benewasuncoated serveweathercoatings than the polyester rein the APP modified membranes.or exposed toas a fitsfortheunderlying forced membranes. With everydayToining control area, so that thetedmembranes,shielding the better examine certa coat coa by temperaturechanges,andtheings\'performanceoverhot membranescouldbecomp membrane fromthe aredadverse resultant thermal movement of aasphaltbuilt-uproofs,bothwiththeuncoatedmembranes.effects of direct exposure to roofmembrane,thefiberglasshot-asphalt glazed and non-glazedAlsowithin eachof thedifferentsun and weather. T finding his reinforcedmembranes arecom areas of the membranes were pre roof membrane areas,half of themayseemlikeanobvious to applica bservation. monly believed not to expand andpared and coated.areas were primed prioro However,this contract as much as the polyesterRoof Coatings:Eight differ tionthe coating and half of thefinding was verified by careof r membranes. Thereforeentroof coatings are involved inareas scheduled to be coated werefullyremovingsmalllocaeinforced the coatings with lower elongationthisjointresearchproject.Theleftunprimedpriortocoatingtionsofthecoatingfrom (properties,andloweradhesivetypesofcoatingsbeingstudiedapplication.Thisprimedvs.coated membranethen areas, ~peel strengths,may performare:unprimed configuration of the test andContinued on page 10 9'