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1952 Theatre Catalog, 10th Edition, Page 174 (140)

1952 Theatre Catalog, 10th Edition
1952 Theatre Catalog
1952 Theatre Catalog, 10th Edition, Page 174
Page 174

1952 Theatre Catalog, 10th Edition, Page 174

the base coat is to be carried over the flashing.

This reinforcing is applied horizontally, furred out from the wall from one-quarter to three-eighths of an inch by means of self-furring dimples or furring nails, and is secured with galvanized nails placed a maximum of eight inches on center. The nails should be long enough to insure firm anchorage in studs and sheathing, or in mortar joints in masonry. Reinforcing must be lapped not less than two inches at all edges, and, where frame walls meet masonry construction, a lap of at least four inches must be provided.

Care must be taken to prevent reinforcing from pulling tight on outside corners, and it must be furred at least a quarter of an inch from each corner so that base coats will fill in solidly behind the reinforcing. Metal reinforcing on inside corners must be butted, and securely nailed in place, but not connected. Additional reinforcing must be applied at the top, bottom and corners of all openings.

It is important that all openings, copings, overhangs and chimneys be prop erly flashed or caulked to prevent moisture penetration. Of course, this should be done before the application of metal reinforcing or base coats.

Base Coat

Next comes a heavy base coat, which is trowelled on, and forced back of the steel covering. This in principle, forms the same reinforced concrete as is used in heavy construction, but it is much lighter. The base mortar consists of one part Portland cement to three parts uniformly graded, washed plaster sand, and seven per cent hydrated lime. Care must be taken in the mixing of this mortar so that all components are accurately measured and thoroughly mixed after water is added. The water content is the minimum necessary to obtain proper workability.

The base coating is applied in two coats on metal reinforcing to a total thickness of three-quarters of an inch.

Tile, concrete, or cinder block surfaces are given a one-half-inch coating of the base mixture, which is then crossscratched and allowed to cure, during which time the base coating is kept

THE. ORDER OF COATINGS over several dilierent materials such as cinder block and wood is seen in this View together with a cross-section oi Penna-Stone in the process of application.

continually moist and free from frost for two days from its application. No pounding or hammering on either side of the wall can be permitted during the curing period.

Before the base coating is applied to old poured concrete surfaces, steel reinforcing should be applied or the surface should be sand-blasted to a sufficient depth to roughen it for the suction required to insure a proper bond with the base coating.

New poured concrete structures should be acid cleaned with a solution of one part muriatic acid to three parts vater. The walls should be wet prior to the application of the acid so that the acid will act on the surface only. After the acid treatment, the concrete should be thoroughly washed with clear water, and, when dry, should be broomdashed with a one-to-two mix of Portland cement and sand.

Perma-Sl'one Coat

At this point, the artistry begins.

At least nine days after the base coatings have been applied, trained mechanics can go to work with PermaStone hand molds to lay on the special Penna-Stone facing compound in indie vidual castings of various sizes, shapes and contours to simulate quarried stone.

The facing compound, consisting of Portland cement, aggregates, crushed quartz, mineral colors, metallic hardeners and waterproofers, is mixed dry to a uniform color, and then is thoroughly mixed to uniform consistency after enough water has been added to obtain proper workability. The Perma-Stone facing compounds offer a wide range of natural colors, making it possible to reproduce almost any stone indigenous to the locality. Only standard factory color combinations can be used.

The molds come in standard lengths of 8, 16, 24 and 32 inches, and stand ard widths of 4, 8 and 12 inches. Also available are jack arch molds and keystones, angles for various pitched roofs, and corner molds with attachments to make returns up to eight inches, in oneinch steps. Odd sizes can be cut after casting.

The mold is first lined with a wax paper membrane, and the colored surfacing material is sifted in to obtain varied colors, and veinod and mottled effects. The mold is then filled with the Portland cement and sand mix, and is presle firmly onto the prepared wall surface. The mold is manipulated to effect a uniform bond, and is removed at once, leaving the wax paper to aid in the curing and to keep off any mortar which might be sputtered on it by the next cast.

All l'crma-Slone is neatly laid in a. proper masonry pattern with the largest side of the stone, form set horizontally, unlch otherwise specified, and with no cross joints. Headers or arches over doors, windows, or other onuninvs are also laid in 21('(f()1'(l:1m'c with conventional stone designs.

The joints are then raked, and the wax paper is striple off, leaving the stone clean and finished with natural


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1952 Theatre Catalog, 10th Edition, Page 174