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1952 Theatre Catalog, 10th Edition, Page 24 (xxiv)

1952 Theatre Catalog, 10th Edition
1952 Theatre Catalog
1952 Theatre Catalog, 10th Edition, Page 24
Page 24

1952 Theatre Catalog, 10th Edition, Page 24

decorative mouldings, lighted covers, domes and panels on ceilings. But, while these elaborate designs are impressive in plans and photographs, they are rarely discernible to an audience, and represent an expenditure which will bring few or no returns. .

If the ceiling is in poor condition, it will have to be replaced. Unless the ceiling is in first class condition at all times, it is a source of constant danger to patrons seated below and, consequently, is a great responsibility to the management.

New Ceilings

In regard to the installation of a new ceiling, several important points should be noted. The ceiling will most probably be plaster on metal lath attached to furring, which, in turn, is suspended from the roof structure. The main members of this furring should be one and a half inches by one and a half inches by three-sixteenths of an inch steel angles or two-inch rolled steel channels, bent to the contours of the ceiling, and suspended by means of one inch by three-sixteenths of an inch flat iron straphangers, four feet on centers. These hangers must be securely fastened to the structural roof members by means of special clamps and stove bolts, and to the runners by means of bolts through holes punched in the hangar and the angle. All of these iron straphangers must be under tension, and the load must be distributed evenly among them when plastering is completed. Three-quarters of an inch cold rolled channels, 12 inches on center are attached across the main furring angles or channels with tested wire clips. Wire ties are then used to attach the metal lathing to the channels. To insure ceiling support, the lath should weigh three and a quarter pounds to the foot, and should be rust-proofed. All hangers and furring members should be rustproofed or thoroughly painted after installation.

Three coats of plaster are applied, namely the scratch coat, brown coat and finish coat. As the scratch coating anchors the plaster ceiling to the metal lath, it is of the greatest importance. The plasterer must apply sufficient pressure to force the scratch coat between the voids in the lath so that it will spread out and completely enclose the lath on the top side as well as the bottom.

When the scratch coat dries thoroughly, the brown coat is next applied. In no place should it be necessary to apply the brown coat in a thickness exceeding three-quarters of an inch to build up a sufficient thickness for the finish coat. If a thicker application of plaster is needed in the brown coat, the furring has not been properly located, and too much of a load is being exerted on the bond between the plaster coats. As long as this condition exists there is danger of plaster falling.

The finish coat can be either a white putty finish or a sand finish, as desired. If pre-cast plaster moulding or other decorations are to be used, they must be firmly tied through the plaster to the furring besides being "stuck" on. However, plaster ceiling ornamen XXIV

FIG. IG-Is the best method (or mounting acoustical bats and fabrics to side-wall panels. Grounds should be 8" in width with a secondary ground 1" wide and 11/3" thick on the outer edge. This latter is used as a tucking edge for the fabric permitting smooth stretching with a 1/3' clearance to avoid touching the rockwool. FIG. 17Below the acoustically treated areas the wumscot can be cheaply made of smooth cement plaster and painted to any desired color. A compensating moulding can overcome the ditierence in plane. FIG. mess the standard rockwool but is 2' wide by 4' to 8' long it should be hung vertically and securely nailed to wood grounds around the perimeter as well as to horizontal grounds across the panels. Grounds of 1" thickness and 2" width are usual and will provide the necessary air space between bats and wall.


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1952 Theatre Catalog, 10th Edition, Page 24