Document v6xGJJD28Qr3JbgMVEOJDabV8

Yh .%?v.v7ir': ' USG-1356 y>r> rYs>\ -~V. m >J '<jOO. \~irtyw.VoO vv v> :vv -/-EXVX Syr. :x.' [ s'y'' i1 -J THE MAGAZINE OF LATHING AND PLASTERING 11/ * ,- *XAJ ^* .'Ar-tA- \ fA Biggest Job Yet for Steel Stud Partitions r. Steady Bucks as'J Crack Insurance :-'jJ V*fj? m Roving Sales Show Scores for Plaster * " " >-"'* j ~ iSt "& &ijg`Zv*s& 1*$" ISSUE 3 1956 l ' -S * I* " fi` -tie l<-ei.V^'y-> i. A i*i yi. rf -i. v;^;V. </ i -< i.rv **: i- i} i J-w? ; .at?T? o .-::}> o.. - v'-'v f.;T 0.?>. :--i - -','*. -.iv. a> i < ^3 "C ' .' / , < ' , ' u*~r*tS A * a'-* _, 1 -J xtf Jf~\ gpsj sfcS f , -Oj- . . - *>*!& :/td B) 2 v"V/ A netv bank and office building used steel stud partitions because they are 5 vA 1 i I M ! * -w :t j j .! ig banks are specialists in making money work and B return a profit. The same shrewd eye that evaluates investment possibilities for their depositors' money, calcu lates the risk and return possibilities on a building which is built for their own use. Houston's Second National Bank has changed its name (to the more inclusive Bank of the Southwest) and built a grand new 24-story landmark on the Houston skyline. With the guidance of Architect Kenneth Franzheim & Associates the bank has reached more into the future than into the past for construction methods used in the new building. The methods they chose drew heavily upon the skill of the lathing and plastering trades. The outside wall structure is unique in itself. Two-story factory-fabricated panels provide an aluminum exterior skin for a conventional framework of steel. The panels incorporate window units. A unique perforated aluminum sheet lath (especially fabricated for this job) is attached, leaving 1 '/2-inch air space between it and the exterior fac ing. A grid of reinforcing rods is erected inside of this and four inches of a lightweight aggregate plaster mix is machine-applied to the aluminum lath. Diamond Mesh metal lath covers this assembly, as a base for interior plaster wall surfaces. Interior Partitions Permanent, Easily Removable As landlord of a major office building the bank has a large stake in long range costs, as well as immediate construction expenditure. The Trlssteel stud Rocklath and plaster partition system serves both interests so well that it was adopted for all interior office partitions. Its erection economy compares favorably with painted masonry block, and its structural nature brings economy to this type of building where partition changes are constantly under way to accommodate tenant needs. B HO I B PI 1 0 6 ^ the magazine of lathing and plastering 300 W. Adams Street * Chicago 6, Illinois Elmer H. Johnson, Editor * Richard L. Bullock, Associate Editor F. W. Coessling, Art Director THE LAST OF THREE APPLICATIONS of machine-applied lightweight plaster brings plaster thickness to four inches on exterior walls. Metal lath goes over this as a base for interior surface plaster. WINDOWS are incorporated in a two-story aluminum panel which forms the outer skin of the building. This shows a special perforated aluminum sheet lath and a grill of reinforcing rods furred in from the face of the lath. NOTICE: The following trademarks, owned ond/or registered in the U.S. Potent Office by United States Gypsum Co., are used throughout this magazine to designate prod ucts manufactured by that company ROCKLATH (plaster bosc), TRUSSTEEL (studs), STRUCTO-UTE fperlited plaster), RED TOP (gypsum plaster), PYRQBAR (gypsum par tition tile), TRUS LOK and BRACETlTE (lathing clips), AUOICOTE (acoustical plaster). Ccpynght J956. United Slates Gypsum Co. THE CEILING IS FINISHED before interior partitions are started. The first step is screwing runner track to exposed splines which support the suspended acoustical tile ceiling. When track runs parallel to the splines it is wire tied, through the tile to channels above. Runner track is also stub-nailed to the floor slab. Rocklath plaster base is attached to the steel studs with a removable Trus-lok clip. At the floor and ceiling, a run ner channel secures the studs. The entire ceiling of acousti cal tile suspended by T-shaped splines is installed before partition work begins. Ceiling runners for the partitions are merely screwed at occasional intervals to the exposed splines which carry the tile. Where a partition runner is parallel to the ceiling splines, a lathing wire is pushed through the tile and looped over a concealed channel that is part of the grid supporting the ceiling, in either case, removing a partition leaves only imperceptible holes in the ceiling material, while installing a new one doesn't disturb the rest of the ceiling or floor. To remove a partition it is necessary to break through only the top course of lath. The rest can be disassembled easily by removing the clips. The studs and runner track are left undamaged to be reused in another location. Architect Mooney, job captain on this building for the Kenneth Franzheim organization, cited a combination of this versatility with a high sound transmission loss rating and the openness within the partition as a basic reason for its specification on the Bank of the Southwest job. He felt that there had also been major economies in plumbing, and electrical contracts based on ease of running lines through the open web of the Trussteel stud partition. TRUS-LOK CLIPS are the heart of this system, and allow Rocklath plaster base to be erected at un believable speed. End joints of lath fall between studs. In disassembling such a partition these clips are quickly re leased to remove the lath and plaster, leaving the entire stud structure un damaged for full salvage. STUD ERECTION consists of set ting studs in the track on 16inch centers and fitting a shoe which holds it secure. A flange of the shoe extends under the runner track while the length of it cups around and snaps onto the stud up rights. A single wire tie is thrown around this assembly for permanence. Notice how the stud braces the metal door frame. W THE NEW 24-STORY HOME of the Bank of the Southwest, Houston, Texas Kennelh Franzheim, architect W S Bellows Construction Corp , A A Greer, lathing and plaslern -3 -3 =3 JA -`X \v/ 17/ 4\ \ . -* --3 \ -> j ! r--s i -y i -J ''J y i ->- ed topics' photographers caught up with lath and lathing. They have heard how lath and plaster partitions R. plaster's roving sales show when it stopped to dem with steel studs and clipped-on gypsum lath can be erected onstrate the latest developments of the trade to Houston's at equal or less cost than painted masonry block. architects and builders. As it travels from town to town the truck is parked in a The truck-auditorium idea was adopted early this year convenient downtown parking lot. Prior to its arrival, invi by United States Gypsum Co. and adapted with special tations are issued to those who can benefit most from the equipment to do a significant promotion job for the lath systems which can be demonstrated in the truck. and plaster industry in all parts of the United States. By In its opened condition the truck can accommodate an August 1 more than 2,700 top-flight architects and con audience of about 20. It is air-conditioned, cooled or heated tractors had seen the demonstration. for audience comfort in any kind of weather. When the For many of them it opened entirely new concepts in the weather is good, as in Houston, the sides are left open. use of lath and plaster. New systems they had read about Groups are sufficiently small to allow personal attention became challenging possibilities when architects saw them to their individual questions. The fact that they have re erected before their eyes. They witnessed the assembly of sponded in large numbers to invitations to visit the truck, the Trussteel stud and Rocklath plaster base partition, and have lingered after the meetings to discuss lathing and the Brace-tite system of attaching lath to ceiling channels, plastering is evidence of the telling effect the display is and the use of furring clips and channels for outside wall having for the benefit of the industry. ' * ^ ' \ '*5 %. i--.S i J ; How to anchor door frames for l 11 - J *1 \ -/ ' 'J j S \ IJ -.> 1 ast year plaster manufacturers shipped 2,657,000 frame, which is also grouted as the tile are laid. A third Lj tons of bagged, building plaster--but not one crack protection is to connect each side of the frame to the was shipped. However when the plaster was converted partition with corrugated metal ties placed at the first into literally miles of walls and ceiling, an occasional joint at the top, bottom and at the mid-point. Strips of crack appeared. metal lath, "ears," placed diagonally at the corner of In no business does the old proverb, "an ounce of the opening also give an additional protection. prevention is worth a pound of cure," hold more truth. Practically all of these cracks could have been prevented by following five steps of good lathing and plastering, a) Sound structural framing; b) Correct installation of good plaster bases; c) Proper proportions of aggregate to plaster; d) Application of plaster in full standard thickness; e) Proper heat and ventilation during setting. Metal door frames are often a source of special prob lems, which also have a solution in proper practice. Problems are caused by either of a combination of two factors: 1) differences in the coefficients of expansion of the metal and the plaster; 2) movement of the metal frame due to insufficient attachment or rigidity. Regardless of the type of plaster partition, a few TWO-INCH SOLID PARTITIONS (Metal or Gypsum lath) Prior to lathing, all steel bucks should be fully grouted, leaving a V-groove not over %-inch in depth for the lath. The bucks may be braced separately with 1 x4's or 2x4's wedged between the floor and the ceiling and the jamb faces. Wire is used to tie the jamb and brace together 12 inches from top and bottom and at the mid-point to eliminate the need for struts. If struts are used, they should not exceed 5/s inch in the direction of the plaster thickness. Too often, struts are so thick they do not allow an adequate thickness of plaster to be applied. special precautions will eliminate practically all cracks around such frames. To give the frame the rigidity STEEL STUDS & LATH PARTITIONS needed to resist movement, it should be grouted full of plaster. The metal frame and the partition should always be tied to one another structurally. And prior to the set, the basecoat should be cut around the edges of the As with other partitions, the important thing is to keep the door or window frame solidly in place. It should be fully grouted. Floor anchor clips should not only be openings to allow for expansion. A V-notch at the join ing of plaster and frame also reduces chipping. Application of these general principles requires a different system with each type of partition. NOT ONE CRACK will be found in this truckload of plaster. If cracks do appear on the job. they will probably result from lathing prac TILE PARTITIONS tices that transmit the stress of structural movement to the plaster. Whether gypsum or clay tile is used, the lintel should be reinforced. This is accomplished on the job by con necting the tiles to be used over the opening with Vs" rods through outer core holes which are then grouted with plaster. In place, the reinforced tile lintels distrib ute the weight evenly over the frame head. Another method to discourage movement is to lay tile into the BI3018 2 1 9 0 i i1 MASONRY THE should be fitted into metal door frames, which are fully grouted as the tile is placed. This procedure ties the partition and buck together for greater structural strength, minimizing crack-causing movement. welded to the inside face of the jamb, but to the return of the flanges on each side. Four jamb anchors should be welded on each side of the frame, with the first one near the head and the second 12 inches lower. With the steel stud well secured by insert clips the possibility of distortion of the frame in relation to the partition plane is minimized. If struts are used, they should be at least 14 gauge steel, 214 inches wide and %-inch flanges. Struts should be anchored at the top of the frame and 24 inches lower. Struts are not needed with proper jamb anchors. Where gypsum lath is used, additional protection is offered by stapling 13 Vi x 19 Vi-inch "ears" of self furring 2.5-pound metal lath at the frame corners. The self-furring mesh brings the reinforcement out near the surface of the basecoat where it is most needed. Plaster experts agree that the occasional field prob lems that have occurred in the past are usually due to adapting partition assemblies to jobs where other types were specified without adding provisions for door frame construction and anchorage details. By following the methods and recommendations outlined, the plastering contractor can rest easy, knowing his men have com pleted a "job well done." REINFORCEMENT of gypsum or clay tile lintels is simple insur ance against cracks. A reinforced lintel is created by join ing the tiles with five-foot 3/s-inch iron rods through two of the core holes, which are then grouted full with mortar. In place, the reinforced lintel should carry over onto the partition structure by at least four inches on each end to distribute the weight load. "Ears" of metal lath also should be placed diagonally at the corners of the door frame. BROWN AND FINISH COATS of plaster should be grooved back where they meet the metal frame to reduce possibility of chipping. The base coats should be cut free of the bucks across the top of openings and at least 12 inches down each side after plaster has stiffened and before setting. -Vi I.'i TRUSSTEEL STUD PARTITION requires the metal buck to be anchored to the steel studs by wire tying or weld ing. Four jamb anchors are recommended: the first near the top: the second 12" down, and the other two spaced equally along the jamb. Use of a fulllength of gypsum lath over the lintel is also urged. '.-a a JJUL O I 7 J U i n\7 300 W. Adams St., Chicago 6, Illinois * Return Pbstage Guaranteed JNITED STATES GYPSUM COMPANY DISTRICT SALES OFFICES are located n the following cities. Further information about any item in this maga:ine and complete details about all U.S.G. products are available at hese offices. VLBANY VTLANTA BALTIMORE BIRMINGHAM DALLAS DENVER DETROIT GRAND RAPIDS BOSTON HARRISBURG Newton Centre, HOUSTON dass.J* INDIANAPOLIS BUFFALO JACKSONVILLE charlotte KANSAS CITY CHICAGO LOS ANGELES CINCINNATI LOUISVILLE CLEVELAND MILWAUKEE Cleveland Heights, MINNEAPOLIS Ohio)* `Mailing Address NEWARK (Clifton, N. J.|* NEW HAVEN (Hamden, Conn.)* NEW YORK OAKLAND OKLAHOMA CITY OMAHA PEORIA PHILADELPHIA PHOENIX PITTSBURGH PORTLAND PROVIDENCE (Warwick, R. 1.)* RICHMOND SACRAMENTO ST. LOUIS SALT LAKE CITY SAN ANTONIO SAN DIEGO SEATTLE SAN FRANCISCO SYRACUSE (De Witt, N. Y.|* WASHINGTON (Arlington, Va.)* RT-63 what's your problem in acoustics? Is it clarity of speech to the very last row? V Is it quieting the rush of many feet and voices? reverence through quiet? as it was for Notre Dame High School for boys, Niles, III., where all of these photographs were made. Especially designed for beautiful, even-textured spray-on application, Audicote works equally well, hand applied. Light reflection: .65 (satin white) Noise reduction coefficient: up to .60 It's a grand new experience in sound control with plaster --new in beauty, new in application ease, new in results. See your USG salesman or write Red Topics magazine for further information. 53 O D <1 reatest A i 3Y SUM u iluinq CD r.) n0 pj Belli & Belli. orchitccls, luczak Bros , plastering contractor; Horry Reuse Lathing Co., lathing contractor a a a