b'_ u-"-"-""-\'-.:::-\'_ & n=s_w e r s -l e st i o n s -\'-A_- =\'\'\':._ Question RegardingDisposal Asphalt Q. Recently a roofing contractorof asphalt are kept in suspensionfilaments covered with athermoran intotrouble regardingthein aldlidified state. Onplastic binder andwith co but unso saturated dumpingofscrapasphaltasthe roof, the solvent incutbackasphalt. the unsuitable for sanitary landfill. Is itsoftens theingof oppos surfaces suitable?speciallyfelts, fusing themQ. Is Factory Mutual (FM) only coated A.Yes. Asphalt, by virtue of itstogether as it evaporates.t concerned with fire and wind forces Cemenadhesion and resistance to decay isingtakesplaceinemulsifiedon roofs? actu anmaterial for asphalt application when the waterA. F classifies roof allyidealsani actory Mutual tary landfill. It will stick to other inemulsion evaporates,asse for th fire characterthewhichmblieseir wise unconsolidated material andm that the fabric, such as openistics and wind up-lift resistance eans greatly increase the final bearingmesh glass fiber, must be used infor their mem insuran compaberce strength of the fill soil. In fact, aorder tolow the water inrnies. H ,ry alvapo owever the Facto Mutual rather successful method of solidform to pass through the fabric. Bysystemits associa disions andte divwastedisposaldependsupondiluting the cutback asphalts stillor field offices serve as construcsprayingloosematerialwithfurther,primer is used withtion advisors to building owners. asphalt asph emulsion and conida thin coating for the p ing ofEvery potential hazard, including altsolat rimpress.heesu masonrye,of ing the mass in aT r lt concrete decks andsur fir wind, corrosionfasteners in ingcubesareclaimedtohavefaces and for asurface coatingmet deck l,tning, thinals, hai ligh snow load-bearing properties similar toon sm thbuilt-up.and live loads, are researched by oo surfaceroofsconstruction blocks.By adding other organic reinfor ngFM.prevention standards and ci Loss fibers, cutbacks produce bitumi approval standards are developed Q.are the two basic types ofnous plastic cements used as trow to guard again them. To confirr Whatst cold process asphalts?elablefor cold processthat arial or roof assembly materialmateA.T typesofcold processroofs and forflashingswill p satisfactorily under wocementingerform asph are in general use, cut to walls. It isbitumen inactu fire, wind or other condialtstheasphaltal b asphaltsandemulsifiedand coal tar products that is thetions, FM develops performackance asphalt. T cutback asph is liq waterproofingUsed alone itsstan that test the materials healtagent.dards uefiedbyintroducingintothesu b itytotemperatureunder simulated fielditions. scepti il condasphaltsomeofthepropertieschanges makes necessary a rein Pertmancestandardsare ortaken outbydistillationoftheforcing agent. Thissupplied byreviewedthroughconsensus is crude petroleumkerosene or naph bitum ous f such as asphalt,process by the industry,nin abricsma ufactha. Emulsified asph consists oftar and glass felts.turers,usersandtheF tory altacstraight run asphalt liquefiedMutual organization. by clay emulsifiers and water.Q.Whatis rag felt? Inboth,mediumfinelyA.Ragfelt isdesigna Q.isd between theWhattheifference st and divideddu tion identifying feltsFactory Mutual Class 1Class likeparticlesformerly made from2 construction? rags.T theyareA. Factory Mutuallso known oday(a as manufacturedmainlyFactory Mutual Research Corporafrom wood fibers,tion - F u two classifiMRC)ses wood flour, wastecations, Class 1Class 2, to and paperandadescribe fire.1the hazards Classis small percentageleast hazardous. To achieve a Class of rag. T are1assembly, use of heyroofapproved Isaturatedwithproductsisrequired,andthe \\asphaltortar.assemblybe designed and must Whereas, glassinstalledinaccordancewith feltsarecom applicable "L P vention Oat ossreprisedofglassContinued on page 8'