b'_; Useofthesesuggestionsshouldgreatly reducesplitting failures andshould.increasethepossibility ofrealizing thetwenty=yearlife expectancyofbituminousbuilt=uproofsoThereductionofsuchfailu~es wouldsavethenationmillionsofdollarswhicharespenteveryyearto repairandmaintainbuilt=uproofsystemso SUPPLEMENTARYINFORMATION Althoughthermalshrinkagealonedidnotaccountforsplitting failures,it isafrequentcauseoftheflashingspullingawayfrom verticalsurfacesoThistypeofrooffailurecanbereducedbyfastening theflashingsmoresecurelytotheparapetwallsgexpansionjoints,and otherverticalsurfaceso Withtheflashingssecurelyfastenedtotheverticalsurfaces, thestressset-upinthemembranebythermalshrinkageofthemembrane wouldincreaseoThisincreasewouldnot~however,beofsufficientmag- nitudetocausesplitting,particularlyifthedescribedinnovationswere incorporatedintotheroofdesignoThusanothertypeoffailurecommon tobuilt~uproofsystemscanbedesignedoutofthesystemo [EDITOR 9 SNOTEgWeareindebtedtoWilliamCoCullenforhispioneering researchintheroofingindustryoWehaveorderedandwillshortly supplyyouacopyofNBSMonograph89"EffectsofThermalShrinkageon Built-UpRoofing"preparedbyMroCulleno] THESHRINKINGROOF AVAILABLEONFILMSTRIPANDRECORD "TheShrinkingRoof~ACreepingCatastrophe"wasthehighlight oflastyear\'sDenverConventionoIthasbeencapturedonfilmstrip andrecordtoaugmentourfilmandrecordlibraryaWealsohaveon filmstripandrecordthe1963conventiontheme"PerimeterProblems: Public EnemyNooloII TherecordandfilmstripareshowntogetherinaDuKaneMicromaticprojectoravailableatanominalrentalinmostcitiesoThe recordcontainsinaudiblesignalswhichtriggerthemechanism,advancingthefilmstripo EwingLoLusk,Jro,QualityRoofingCompany~KansasCity,Missouri,is thenarratorofTheShrinkingRoofprogram,andhehasdone atrulyprofessionaljoboAlthoughthisis thefirsttimewehave publishedinformationregardingtheavailability ofthi srecordand filmstrip,about100copiesarealreadybeingcirculatedthroughout theindustry.Shouldyoudesiretoshowtherecordandfilmstrip toalocalgroup,pleasecompleteandreturntheencl osedorderform. GiveusplentyofadvancenoticeoThereisnochargetomemberso NonmembersareI\'equestedtopayanominalrentalchargeof$l0 a00'