b'1000Power&Light Bldg.,KansasCity, Missouri64705 June,1977 PERIMETERFLASHING/FMDATASHEET1-49 EnclosedisacopyoftheFebruary,1977editionofFactoryMutual System\'sLossPreventionDataSheet1-49entitled"PerimeterFlashing". AscomparedwiththenowsupersededApril,1970editionofthedata sheet,thiseditioncontainsmoreperimeterassemblydetailsplusa discussionofdifferinganticipatedwindforcesbaseduponWindZones 1,2and3asdeterminedinFMDataSheet1-7.(WeforwardedDataSheet 1-7toyoualongwithothercurrentFMdatasheetsinSeptember,1975.) Perhapsthemostsignificantchangewithrespecttotheupdated datasheetisthatelevenspecificrecommendationshavebeenstat ed inthedatasheet.Youshouldreviewthemcarefully. Thedatasheetproperlystatesthatitsobjective"istohelpthe planreviewerandlossinvestigatormakesoundrecommendations,andto assistarchitectsandengineersin makingbetterroofdesigns."Asthe roofingcontractor,yourprimaryresponsibilityandfunctionisthatof applicationoftheroofmembraneinaccordancewithmanufacturerand ._,jobspecs.Yourresponsibilitiesdonotincluderoofdesign.However, bybeingfamiliarwiththisdatasheetaswellasotherFMdatasheets, youmaybeabletoavoidproblemsforyourselfaswellasthosewith designresponsibilityif,ingoingoverplansforajob,younotethat therequirementsofthisdatasheetorotherFMdatasheetsarenotmet. Pointouttheerrororomissiontothepersonwhohasthedesignresponsibility.Toprotectyourself,youshouldrefusetoapplytheroofuntil theroofdesignhasbeenchangedoryouhavereceivedaletterfromthe owner-generalcontractor-architect,etc.exoneratingyoufromliability. WeurgeyourcarefulreviewofDataSheet1-49. MAINTENANCEANDREPAIROFROOFS Atlast,authoritativeinformationwithrespecttoroofmaintenance andrepairisavailable- enclosedisMRCA\'sreprintofthemilitarydepartmentspublicationentitledFacilitiesEngineering:MaintenanceandRepair ofRoofs.Thebookisanupdated,revisededitionofNationalBureauof StandardsReport3994entitledRoofMaintenanceManualdatedMarch22, 1955,andauthoredbyMessrs.BillCullenandH.R.SnokeofNBS. Becausereprintsofthebookwerenotavailablethroughgovernment sources,weendedupreprintingit outselves.Additionalcopiesareavailableatapercopypriceof$3.00(whichcoversourprintingcostplus handling) . .,__,Withthisbook,younowhavetheammunitionnecessarytoshootdowna so-called"expert\'s"recommendationthatbecauseofafewblistersora splitortwo,theentireroofmembraneneedstobetornoff.'