Document rx9ME94d1nx1EvX1NGgBDeJYv

^FORMATION BULLETIN h;0 y Q. D. #7 10-25-65 AUDI COE - ADDITION OF LIME OR PLASTER Audicote advertising pieces P-13 and P-24 include directions for adding line for first coat application over concrete where unprotected steel is exposed. Hand application (maximum thickness l/l6") of a mixture of four parts of mixed Audicote and one part of line putty thoroughly blended on a mortar board is specified. Directions normally specify 'Vhet" to do but not "why. " With Audicote, understanding the "why" Is important. It explains why apparently harmless deviations can be serious. The Audicote must be mixed completely with water Just es though it would be applied without addition of line. Full plesticity must be developed before the line putty is added. Lime, which normally aids plesticity, stops the development of the plasticity of the binder in Audicote. How ever, it does not reverse this process so good plasticity is obtained by first mixing the Audicote completely end then adding lime putty. Mixing the lime putty and Audicote on a board is specified to avoid lime carryover into subsequent mixes. Cn some jobs, gauging plaster has been added to Audicote first coat for heavy or dropout fills. Plester has the same effect on plasticity develop ment as lime. Even a small amount of lime or plaster added to dry Audicote prevents development of proper working qualities end adhesiveness. Therefore, use clean water only. Water in which tools have been cleaned and which cerries either lime or plaster in suspension or solution can cause poor working qualities end related problems. Quelity Dept. Chicago =159 Distribution: Department 159 Personnel. Ft. Dodge, New Brighton end Departments =147-3 and #151 [egersville plants lin o coodo AUDI COTE AIDS H TO GET BEST RESULTS KITH AUDICOTE THE FOLLOWING RECOMMENDATIONS AND SUGGESTIONS WILL HELP TO ASSURE SATISFACTORY RESULTS WITH RED TOP AUOICOTE ACOUSTICAL PLASTER: CONDITION Of BASE GYPSUM PULSTER OR PORTLAND CEMENT BASECOATS SHOULD BE SEMI-GREEN TO DRY. WET OR DAMP 8ASECCATS WILL PROLONG DRYING, AND IN SEVERE CIRCUMSTANCES DROP-OUTS MAY OCCUR. A FULL 5ROWN COAT IS NECESSARY TO MINIMIZE THE POSSIBILITY OF RUSTING THROUGH OF TIE WIRES OR EXPOS ED METAL LATH. RUST INHIBITIVE PROPERTIES ARE BUILT INTO AUOICOTE, BUT COMPLETE PREVENTION AGAINST RUSTING CANNOT BE ASSURED WHEN EXPOSED RAW STEEL IS PRESENT IN THE BASE COAT PLASTER. APPLICATION OF AUOICOTE OVER A DAMP OR GREEN BASECOAT PROLONGS THE DRYING OF BOTH 3ASECOAT AND ACOUSTICAL PLAS TER. A CONDITION FAVORABLE TO RUST MIGRATION. - WHERE AUDICOTE IS SPECIFIED FOR APPLICATION DIRECT TO MONOLITHIC CONCRETE, REINFORCING BAR CHAIR SEATS SHOULD SE GALVANIZED WITH ENDS TURNED UP OR OIPPED IN RUST INHIBITIVE PAINT. OTHER STEEL IN THE EX POSED SURFACE, RODS, NAILS. ETC. SHOULD BE KEPT TO A MINIMUM, AND WHEN VISIBLE. SHOULO BE TREATED WITH RUST INHIBITIVE PAINT BEFORE FIRST COAT Of AUOICOTE IS APPLIED. MIXING ...... AUDICOTE MAY BE MACHINE OR HAND MIXED. MACHINE MIXING'AT A RELATIVELY HIGH SPEED IS PREFERRED; HOW EVER, IT MAY BE MIXED BY HANO WITH SATISFACTORY RESULTS. IN EITHER CASE THE PLASTER SHOULD BE MIXED TO A UNIFORM CONSISTENCY FREE OF LUMPS. WHERE SMALL HANO OPERATED FINISHING MACHINES ARE TO BE EMPLOYED FOR FINISH COAT APPLICATION AND WHERE SLOW MACHINE MIXING OR HAND MIXING HAS FA I LEO TO PRODUCE AN EVEN MIX, THE C-Z-ON LIHESTIR, QUICXSTIR. OR SIMIUR MIXERS PROVIOE IDEAL HIGH SPEED MIXING WITH UNIFORMITY. APPLICATION FIRST COAT AUOICOTE PRESENTS VERY FEW PROBLEMS IN APPLICATION. THE FIRST COAT OF ACOUSTICAL PLASTER MUST BE LEFT AS SMOOTH AS POSSIBLE UNDER THE OARBY. RIDGES AND OTHER POUCH AREAS MUST BE TROWELED SMOOTH. WITH MACHINE APPLICATION OF FINISH COATS. ANY FAULT IN THE BASECOAT IS READILY DIS CERN A 8 L THROUGH THE FINISH COAT. m o <: c o o j o (ever) '-7 30/10/S5 (PRINTEO IN U.S.A.) P-7 (SACK) THE ACOUSTICAL PROPERTIES OF AUOICOTE ARE DEVELOPED BY THE MINUTE FISSURING THAT TAXES PUCE IN THE FIRST AND SECOND COATS UPON DRYING. CARE MUST BE TAXEN TO PRODUCE UNIFORM DRYING. AN AREA THAT DRYS TOO FAST WILL DEVELOP EXCESSIVE FISSURING, AXO IN EXTREMES MAY OEUMINATE IN A CUPPED FASHION FROM THE BASECOAT. DIRECT ANO LOCALIZED BUSTS OF AIR MUST BE AVOIDED. IN HIGH WINDS. OPENINGS MUST BE SCREENED OR CLOSED TO PREVENT TOO RAPID DRYING. VENTIUTI ON IS IMPORTANT, PART ICUURLY IN WINTER, DUE TO THE HIGH CONSISTENCY OF AUOICOTE, BUT THE PRECEDING CAUTION TO PREVENT EXCESSIVE FISSURING SHOULD BE FOLLOWED. UNIT HEATERS OR SAUMAHOERS MUST BE PUCED AND OIRECTED SO THAT THEIR EFFECT IS UNIFORM AND NOT LOCALIZED ON THE CEILING. SHOULD EXCESSIVE FISSURING DEVELOP IN THE 9ASECOAT, IT IS A SIMPLE PROCEDURE TO TROvfL IN SOME AUDICOTE JUST PRIOR TO APPLYING THE FINISH COAT. IF DISKING OR OEUMINATION OCCURS, REMOVE THE FAULTY PUSTER AND PATCH WITH AUDICOTE PRIOR TO FINISHING. WHEREVER POSSIBLE, IT IS DESIRABLE TO ALLOW THE FIRST COAT TO BECOME AS DRY AS POSSIBLE. IN THIS WAY EXCESSIVE FISSURING WILL NEVER BECOME A PROBLEM. FINISH COAT Hand Applied Finishes WITH ANY HAND APPLIED FINISH PUSTER. THE FINISH COAT MUST BE LEFT AS LEVEL AS POSSIBLE UNOER THE DARBY AND TROWEL. THE SAME IS TRUE WITH AUDICOTE. ALLOW FINISH TO TAXE UP SUFFICIENTLY BEFORE STIPPLING OR PERFORATING. NO TIME RANGE CAN BE GIVEN AS DRYING CONDITIONS WILL VARY ON EACH JOB. Machine Applied Finishes THE SMALL FINISHING MACHINES, SUCH AS THE E-Z-TEX ANO PUSTER-TEX, GIVE VERY FINE TO MEDIUM TEXTURES. THE URGER MACHINES, SUCH AS THE XARCLIUS ACOUST l-PUMP, SAND HOG 8ASE-C0TER, E-Z-ON, AND PUSTER MASTER, GIVE MEDIUM TO HEAVY TEXTURES. WITH ALL OF THE ABOVE MACHINES, DIFFERENT SIZE ORIFICES MAY BE USED TO VARY THE TEX TURE. CHANGING THE CONSISTENCY, I.E., WATER CONTENT, WILL ACHIEVE THE SAME RESULT. INCREASING THE CONSISTENCY WILL PROOUCE A FINER TEXTURE. (uni' food-.)