b"DaleCramptonJamesG.Dietz FortSmith,ArkansasDavenport,Iowa RonaldJ.McGrawRaymondW.Schultz ElDorado,KansasKansasCity,Missouri JarrettH.VincentGlennE.Langer Topeka,KansasMilwaukee,Wisconsin WilliamR.SteinmetzArnoldLind SouthBend,IndianaOmaha,Nebraska CharlesThompson Fargo,NorthDakota VAPORBARRIER- ISI T? 11Avaporbarrierstopsmoisturemigration. 11TrueorFalse?DefinitelyFalseaccordingtoProfessorE.c.Shum MRCA'stechnicalconan, sultant,whofearsthatmanyroofingcontractorsbelievethecorrect answertobeTrue,duetoacommonmisunderstandingofthephraselfvapor barriern . ProfessorShumanpointsoutthat,infact,vaporbarriersusedin oisture roofingaremerelyvaporretardersofvaryingdegree,whichpermitmmigration,butatreducedrates.Headdsthatfewsheetmaterialsare barriersinthesensethattheyhavezeropermeance,thatis,passno moisture. Thekeywordisretard.Vaporbarriersretardmoistureflow,or,in termsoftime,delaymoisturemigration.Thetimethusgainedincreases theopportunityfordrying. UndertheDeliverDry,StoreDry,InstallDryandMaintainDry(DSIM) approachofProfessorShuman~avaporbarriermakestimeanallyinthe fighttoMaintainDry. SPIRALINGSOCIALSECURITY Inkeepingwiththetimes,thecombinedSocialSecurity-Medicaretax rateincreasedeffectiveJanuary1,1971.Thenewrateis5.2%andis payableonthefirst$7,800ofearnings,resultin8inamaximumannual taxof$405.60.Maximumtaxlastyearwas$374.40,basedupona4.8% tax rate. Andthisisnottheend.SocialSecuritytaxrateincreasesarealreadyscheduledasfaraheadas1987.Inthat16-yearperiod,withnoa dditionaltaxincreasespassedduringtheperiod,thetaxratewil lincrease"