b'WorkmenandWeather- effectoftheraysofthesun(solarwellaffecttheowner\'ssatisfaction. (Continued from pagern)radiation)in raisingsurfacetempera withthefinishedjob. ture.Most American Standards give some panyingcontinuousclep0sitofmois attentiontoterminology.Someare tureontheroofdecksurface.devoted entirely toit.You mayrecall STANDARDIZATION- myrlefinit- ionofastandard-acomTemperatureaulPressureIncreasemonbasisforunclerstancl.ing.Don\'t Another very important property of(Continued from page 27)you think it mightbewell to havea. air and moisture is the pressures thatAssociation, and the Amer-ican Societytryatdevelopingastandardwhich they develop upon being confined andofCivilEngineers,iswellsuitedtowillclearawayambiguitiesandmisthenheated.Eventhoughtheyarethe harmonizing of all view points un unclerstanclings? confinedtogether,eachwillexertatilthereis evolvedastandardwhichTheASAbeingaquasipublicorpressurethesameasifi,thadbeencan qualify for approval as an Ameri ganiza,tiondoesnotrequire - memberconfinedindependently.ThetotalcanStandard.ship asa preliminary to participation pressure in the confined space is equalYouhaveathandasoneofyourin a committee for developing a standtothesumofthetwoindependenttoolsyourNRCACode.Itstechnicalard.All that is needed isa realinterpressures of air and moisture or waterprovisions agree closely with the termsestin thematterin handandawilvapor.of the la,test draft of a proposed Amer lingnesstobeguidedbytheproceIfairisconfinedinaspaceatat icanStandarddevelopedbythe::;ub dureswhichhavebeenevolvedover mospheric pressure with no free mois commtteeofA51whichI mentionedmanyyearstoinsurethatallconture(that is,no liquid water)presentearlier.So far sogood, but in readingcerned havetheirclayincourt. andthenheatedfromatemperature of70 F.to a temperatureof150 l \'.,Mr.Owen\'s"RoofingFactsworthOfcourseweshould,velcomeyour thepressureincreasewillbe2.2Knowing", a most informative pamph associationasaMember-Rodyoran poundspersquareinch.let,bytheway-IwasparticularlyAssociateMember,andanyofyour However,ifforeverycubicfootofintriguedtofindthefollowing:companiesasmembers,butthatistheconfinedspaceapproximatelyl/6"Unfortunately,theterminologyofreallybesidethepoint.\\VhatI want of an ounce of water had been present,theroofingindustrytodayissoam to convey toyou is the availability of atestedtoolofmanagementwhich thepressure increasefrom heating tobiguousastobeveryconfusingtocan facilitate your business-an arm of thesametemperaturewouldhaveanyonehavingonlyacasualinterestourAmericanfreeenterprisesystem been 5.6poundspersquareinch.inroofing."Hegoesontopointoutwhich can enhance your enviable repuThepreceding illustrntion is used topitfalls in this terminology which maytation. call attention to the magni-tude of pressuresthatcandevelopthroughhatingofconfinedairandwater.LaterKANSAS,NEBRASKA,OKLAHOMAANDWESTERNMISSOURf discussionwillshowthatpressuresCONTRACTORSHOLDINAUGURALMEETING of this order may, under certain condi BornattheRoofingClinicbeldatThesecondsessionoftheconventions,bedeveloped within roofstruc Topeka,Kansas,onJanuary12,thetion will be held on Saturday morning tures.iVIidwest. Roofing Contractors\' Associa followed by adjournment.Invitations Roof surfaces commonly attain tem tion elected temporary officers and di to the meeting have been sent toconperatures far higher than surroundingrectors whose initial instructions weretractors,jobbers,manufacturersand air temperatures during periods of ex todraftaconstitutionandby-lawsotherindustrymembersinKansas,. posuretotheraysofthesun.Theand setup plans for thefirstgeneralOklahoma, Nebraska and v\\Testern Misamount of heat absorbed from the sunmeetingof thenewassociation.souri. on any surface isdependent upon theTheiVIillwestofficersanddirectors angle of thesun\'sraysand thecolorheldaconferenceonSunday,MarchContractorsintheareacoveredby of the surface.As illustrated in Figure] 1, with Mr. R. B. Stevenson presiding.theMidwestAssociationareurgedto 4,thetemperatureofadark-coloredwrite Andy Speers, Midwest Vice-Pressurfacemayrise70 toS0 aboveMr.Stevensonisapartnerintheident, c/o Harry Dobson Co., 1717 East theoutsideairtemperature,andtheDechancl Roofing&SupplyCompany,2nclSt.,Wichita,Kansas,lettinghim temperature ofalight-coloredsurfaceInc.,ofTopeka,Kansas.Aguestatknowhowmanyrepresentativesof mayrise20 to30.the meetingwas thePres,identofthetheirorgani7.ationwillattend.Mr. DuringthesummermonthsblackNational Roofing Contractors\' Associa Speersstatesthatwhilehehasmacle roof surfaces may attain temperaturestion, Mr. Mert T. Buckley.everyefforttosencl invitationstoall of150 F.to170 F. Thus,itisseen Theconference,attendedbydirec industry members, he may havemissthatrooftemperatureextremesmaytorsfrom four states,selectedSalina,ed some and urges all to attend whose farexceedextremesintemperatureKansasforthesiteo.ftheInauguralplaceofbusinessisintheMidwest ofthesurroundingair,varyingfromMeetingoftheMidwest RoofingCon\'.:Association area. 10 F. to 14 F. below air temperaturetractors\'Association,thedates hehig to70 F.toS0 F.aboveairtemper March30and31.MidwestdirectorsMANUFACTURERS atureundercertainconditions.willmeetattheLamarHotelon FriTheprecedingparagraphshaveday, March 30, and at a ltmcheon meet TO EXPAND SALES brieflyexplainedthebasicprinciplesing discuss the agenda for the conven ADVERTISE relevanttoananalysisofroofper tionmeeting.Registrationforthe formance.Theseare:(1)Thedefini Midwesteneralmeetinsat.-2IN tion of humidity;(2)the mechanics ofE:M. nncl at TT.M.NATIONALIndustrial condensationandprecipitation;(3)ceedings willstart. MARKET thepressuresexertedbytrappedair.Following the meeting therewill beROOFERDATABOOK and moisture when heated; and (4)theabanquetand entertainment. MARCH1951PAGE31'