Document OmvpDyrMKq2n5a70pneaZ6Oe

FILE NAME: Roofing (ROOF) DATE: 0000 DOC#: ROOF004 DOCUMENT DESCRIPTION: Trade Journal Article - Airborne Asbestos - Test Results rr~ )rx r,|7 ' 'li^lu ^ CT* Z ( & tstT A b i s i H b II v j b \ ^ v -fio u A t .t > u fiv i a s ti C./JIW ^ 1*S A ' * * "*' ls t u s c - e r r e * - - Johns-Manville and NECA find some encouraging data - If you are a close CSHA-watcher, you know that last year the Feds issued an "emergency" standard covering airborne asbestos. Tbis standard calls for a maximum of 5 fibers per cubic centi meter in all workplaces. The standard is scheduled to be tightened to 2 fibers in 1975. . t: - x. - i NRCA was concerned that there might be a release of asbestos fibers from the handling of asbestos felts. Johns- Manville has been most cooperative in i scheduling testing to determine the *V- : - am ount of asbestos released from the f -jL- V ' e- r. F3ier Canisters were Pinned to the Men's . Shirt Fronts 12 - 'V . ' 1 V -.W V / - . -Wk *.i '_ if >- .* T-,.. ' u Pi V 1 6 i W ; `VI J % M op, Ro und H ot Aten .-ere Equipped with T e stin ' Devices handling of asbestos felts on the rouf. The most recent test was conducted in May at a school job in Hobart, Indiana. D. R. Christensen of J-M's 4 Environmental Control Division con ducted the air sampling, using six battery powered testing units. These units consist of a battery pack and air pump, attached by a rubber hose to a filter canister. The air filter is a cellulose-ester material with a pore size of 0.8 microns. Air is pumped through this filter, thereby trapping dust and fibers on the filter. Later, in the 4 I iitt- i*1uf~niatiTi.il is iliv inj: only the dust aiul fibers, stus fibers arc counted on a ViicnC using a conventional opmicroscope. Only asbestos fibers ijc r than 5 microns arc consiileicd annful by 05*11A. Three of the testers were set up on the roof, downwind from the roofing work. The mop man, roll man. and hot man each had a tester hooked to his belt with the filter canister pinned to his shirt front. Results of the testing were as follows: Asbestos Fibers Location . Per Cubic Centimeter Mop Man . 0.1 Roll Man 0.1 Hot Man 0.2 Downwind No. 1 0.1 Downwind No. 2 0.4 Downwind No. 3 0.1 ih.tnus h.ul icail.ngs ot 0.5 lihcis, 0.2 filial, and 0.2 fibers, v.-ith stationary locutions all reading 0.1 fibers. On the basis of this data, it appears that we have no problem whatsoever in handling ohrctr.e frits Tear-off jobs show higher figures but arc still within the 1975 standard. Following are the results of a test conducted at a' tear-off job on a St. Regis Paper Co. facility in Bridgeview, 111.: Asbestos Fibers Location Per Cubic Centimeter Tear-off Machine Operator 1.6 Pick-up Man No. 1 1.5 Pick-up Man No. 2 0.8 Shovel Man -1.4 Tractor Operator 1.7 Chute iMan . 1.3 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 425%. A previous test at a roofing job on the University of Wisconsin Parksidc Cam pus yielded similar results: three me- This job generated moderate to heavy visible dust, found to consist mostly of fiberglas 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 fsberglas. dust exposure.. We may well ha problem on tear-off jobs in the fu;. .. o * M -. \ ^ - .V - . -r - s \ ' i* v3 7 . 7 f r . - 'll: T its r s k s yes w h y wk>vlmii is sg g sssL 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 lor roof movement. Seal. The ability to .maintain watertightness over the years that a building settles. Without cracking, splitting or drying out. FlexseaL A vinyl flashing that over the last ten years has meant fewer call backs for roofers. Less maintenance. And increased life. And Flexseal vinyl flashing is just one o! several vinyl 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. Through- wall flashing. Masonry control joints. T h ey 're all modem, job- proven products that live up to the promise of their name. For a free 24-page booklet on all the Flexseal vinyl systems, write the B.F.Goodrich General Products Company, Dept. 0445. Akron, Ohio, ------ 44318. R n u h * o f lie H o b a rt, liu l. teal iiu liw tc li.' t a s l .o i o i fell* p rc ic n t no p roblem for OS11A com pliance.