Document Y9eNOmDMOjknV1xJ8EY3nvgnD

If yon are a dose OSHA-watchcr. yoa know (hat last year the Feds issued an "emergency" standard covering airborne asbestos. This standard calls for a maximum of 5 fibers per cubic centimetcr in all workplaces. The standard is scheduled to be tightened to 2 fibers in 1975. NKCA was concerned that there might be a release of asbestos fibers from the handling of asbestos felts. JohnsManville has been most cooperative in scheduling testing to determine the amount of asbestos released from the Filter Canisters were Pinned to the Men's Sturt Fronts 12 handling of asbestos felts on the roof. The most recent test was conducted in <, May at a school;; job. in ... Hobart, Indiana. D." R.Qiristensen,of J-M's Environmental Control Division con ducted the air sampling, ' using six battery powered tesdng units. These units consist ofA^&ixay pack and air pump. attachejj4Syr'a rubber hose to a filter canistft^! The' air filter ' is a cellulose^ster material with a pore site of 0.8'microns. Air is pumped through this filter, thereby trapping dust and fibers on the filter. Later, in the 20088142 - : M, unpnwdi.fipossa>ilityi ^^v;,ocwy^ejcpctKMture:j }> : . time to"*diiartfe husiv; lunflcnttn ^yttiQwnKBttr^ft^vuniHiim ^sipoitc.^ through v the^ uiePfSSbilrlTOfia^ _. . f3cen. which v'tre^ _____ ,_:: cvcr,v.t!iecfilteis* preaead Va.-j 4^$i.iurjfe *^*.'. ~^-jmr c^EipWcsSn^;nnp , 0, futcryui K^jg&S&rif5553* ', SSiimmnpilcerr,'mmomtee.' It-cMasihiblele^^ffiillrtOrnT'hI aro^mitlyet; been pti .. Weatherproof standpipe ,* yv and fiangemade from sheet copper^ Ex 3. Afterburners tie perhaps the most immediately ...,, practical, solution* __ , they arecommcrcrally /inuU^___ bcen^tesong! m, ^ elusive fluted polyethylene core. Easy to" install, it will outlast I copper;RoopJbRAiisb diffaent crttont.ofcifterottiwagfi:wiConanocm-mat$M' RE-ROOFINGl ,-. area.:The.cffkia^^offafccrtnmcajSitnened co by Jhd A funnel type drain, with, strainer;;v 4. Another possible approachto tne~;emission problem^* has been suggested by Professor Thomas. If the production > of emissions is considered as a distilhtioa process, then it ' should be possible to use a condensing unit to break up , 'dome. One-piece copper flange J and drain is soldered to seamless -' copper pipe, which fits inside ex isting leaders. Optional gravel stop or sediment pan for smooth surface roofing. _ ..... the aerosol mist, and collect the Ikjuid or return it to the kettle. WRITE FOR SPECIFICATIONS AND PRICES. MARATHON ROOFING PRODUCTS INC. 367 N>kI OrfcM. Buffalo. N.Y. 11225 Tihplwu (716) 685-3340 * . . . perhaps nothing is mors Important than letting NRCA know of any developments 5. There arc several additional kettle modifications whrch arr not directly related to emissions per se. but which could influence efficiency of operations and therefore die emission level, particularly if cracking is a^ important emission source. Basically these involve altera ttons in the heating and handling systems. Better loading systems such as "revolving-door" or marl-slot devices will reduce the atmospheric exposure of the vapor-filled air space in the kettle. It is very desirable to reduce the presence of hot-spots in the kettle, particularly on the surface of the heater tubes, since these superheated surfaces can cause cracking reactions in which fragments light enough to contribute to emissions can be torn off the asphalt molecules. Our dan indicate that this does indeed take place. Redesign of the kettle to minimize hot spots or to improve circulation and thereby cut down the exposure to the hot areas would surely be desirable. NRCA is working with manufacturers in this area. But whatever the ultimate solution -- whatever the immediate problem - perhaps nothing is mote important than letting NRCA know of any developments if and when they occur. The problems have been largely isolated; the solutions are largely tentative. NRCA has invested a great deal of time and money in avoiding problems and proposing solutions, and will invest a lot more time and money a< research continues and pending cases begin to finalize. THERtVI-O- DECK The Dry-Apolled Roof Cavity Filler or Leveler Easy to use, lightweight Tnerm-O-Deck dry filler provides positive, permanent results in correcting low spots, irregularities, and builds in slope for proper drainage on old or new roofs. Can be roofed immediately. Great for small patch jobs. 1. Pour from the bag over asphalt primer. 2. Spread and screed to desired slope. 3. Tamp or roll to required thickness. $*nd for Utoroturo J. J. BROUK S. COMPANY 1J67 S. KlnoNcftway SL Urla, Ma. 1110 Ptvor* (314) S33-9022 20088143 ,Op: 3?. ' illtlis1?^ - A|y;.:;, -. .0.3 fibers, 0.2 solved, Kesving otuy, the Ai^andJibers.^f;fibm, ;nd -0.2V ftbcirs/Jwith suttomry s'--* loTM --c--a--tio--n--s-- aaIl.t.r--e--a- d"ing 0.1I ' *fib*-e-rs. ^^the.lwBB^of^mtsJdatir it appears rfuf'iitr jiiitr n n 'nrnhtrm ` mti ifmrurr **'r r^^>^t;.^.;iAow;:h%her:'figures but are still within iThiceeJdf the'testers were set up on the &';,thef;1975 standard. j1 " roof, downwind from ther roofing work, ; mao,;toU ntan; aiid hoc'man&FoHowing .fare 2theyresults of a test eacht had iteer.btxiked.to. his-bettJSjf, conducted jitsaj tear-off job on a St with;.'.0e^; futeryicantster pinned; ro hts 'g< Regis* Paper Co.; facility m Bndgeview, fshirtlfront.' Results of 'the testing*woefjp aW"-,---1 .fxi.'t..- , .... W^ssss^^r^-i ** 1 ...- ......-?. rr '** * '-r; a?-'?**< Asbestos Fibers i,ix Locations':^ ;.j-, Asbestos Fibers Location Per Cubic Centimeter Per Cubic Centimeter. .Tear-off,. Machine:: fgD^sArf n<,:y: ,:-f Downwind No. 2 ' Downwind No. 3 Pick-up Shovel Man Tractor Operator Chute Man The relatively high reading at the No. 2 Downwind Station is interpreted to be caused by normal statistical varia tion. The results are accurate with a tolerance of 12S%. A previous test at a roofing job on the University of Wisconsin Parkside Cam pus yielded similar results: three mc- This job generated moderate to heavy visible dust, found to consist mostly of fibeiglas insulation fibers. It is interest ing to note that the National Institute for Occupational Safety and Health is currently considering a criteria docu ment for fibergias dust exposure. We may well have a problem on tear-off jobs in the future. m We didn't name our vinyl flashing by tossing a coin. We named it Flexseal" because we know the job it is designed to do. Flex. The ability to expand and contract to compensate for roof movement. SeaL Hie ability to maintain watertightness over the years that a building settles. Without cracking, splitting or drying out. Flexseai. a vinyl flashing that over the last ten years has meant fewer call backs for roofers. Less maintenance. And increased life. And Flexseai vmyl Hashing is just one of several vmyl products from B.F.Goodrich for moisture and thermal protection. BFG also makes vinyl expansion joint covers, in sheet and extruded form. Waterstops and membrane waterproofing. Throughwall flashing. Masonry control joints. They're all modem, jobproven products that live up to the promise of their name. For a free 24-page booklet on all the Flexseai vinyl systems, write the B.F.Goodrich General Products Company, Dept. 0445, Akron, Ohio, 44318. Rcmlu of the Hobart. Ind. lot indicate that aibotot feltt preaent no problem for OSHA compliance. 2008814 4 (AV