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1950-51 Theatre Catalog, 9th Edition, Page 138 (118)

1950-51 Theatre Catalog, 9th Edition
1950-51 Theatre Catalog
1950-51 Theatre Catalog, 9th Edition, Page 138
Page 138

1950-51 Theatre Catalog, 9th Edition, Page 138

In one demonstration, the waterproofing compound on cinder block withstood a hydrostatic pressure of 500 pounds. Since tests prescribed by the U. S. Bureau of Standards call for a maximum 2" head of water, or 10 pounds pressure per square foot, the reported test is approximately 50 times more severe than government specifications require for passing.

Inorganic waterproofing compounds are effective for ten years and over if they are applied on untreated and clean, porous masonry surfaces in accordance with manufactureris directions; and if waterproofed surfaces are not pierCed by means of screws, nails, toggle bolts, or other instruments. Other basic requirements for effective functioning may arise with individual products.

Metallic-base Compounds

Designed primarily for repair work, a metallic-base waterproofer is available which consists of a special chemical mixture of iron and other chemicals. When mixed with water only and brushed into the cracks of walls and fioors needing repair, this compound will waterproof and stop leaks, even under severe conditions. It is said to be effective on concrete, brick, stone and tile, and belowwater-line basements and pits under pressure.

Asphalt-base Compounds Asphalt-base protective coating compounds are supplied in viscous liquid form, ready for use. One product in this group, of a stable, non-fiowing, nonstaining, mineral colloid type, is made from a blend of selected asphalts, finely divided and dispersed in water by means of an emulsifying agent. This compound is durable under weathering and can be used without heat or fear of fire. The dried film does not sag, run, or flow

A MEDIUM SHOT o! a half completed brick wall being brush resurfaced with Mica Insul-Mastic. The result is an attractive finish that will protect against the ravages of the elements and will pressnt an overa appearance.

(Photo [010181] of burl-Mani: Corporation of Amerira.)

when subjected to the highest temperatures, nor will it craze, crack, or "alligatorll under long exposure. The film remains elastic and smooth, resisting oxidation for many years when applied in the proper thickness. A membrane

and/or cloth can be utilized for augmented protective effect.

Another asphalt-base waterproofing compound, chosen by the US. Government for use in its long-range preservation of armaments and materials, has a moisture-vapor transmission rate of 0.01 grams per 100 square inches per 24 hours for an 14; inch thick coating. This water-repellant product, which contains a high percentage of Gilsonite, is applied by high-pressure spraying equipment. If, in time, the coating is accidentally punctured, the over-all waterproofing efficiency of the coating will not be affected adversely because the entry and spread of moisture will be confined strictly to the puncture itself. Such punctures can be easily patched.

The manufacturer states that, in addition to being water-resistant, this compound is: resistant to acids, alkalis, and salts; rust and corrosion-proof; sounddeadening and vibration-dampening; insulative; condensation preventing; fiexible; tough; heat- and fire-resistant.

Asphalt - base waterproofing c o mpounds, like the inorganic powder variety, require a clean, porous surface for their reception and retention. Their life, too, compares roughly with that of the powder type, lasting from ten to twenty years under normal circumstances.

Plastic Woterproofers

Plastics, the ubiquitous materials of the modern industrial world, have also been adapted to use as Waterproofers. Surface coatings, based upon vinyl chloride-acetate resins, are highly regarded by industry for their capacity to fulfill many of the unusual and exacting

l tidy years.

requirements specified by coatings users. Correctly formulated and applied, VINYLITE Resins yield air-dry or baked finishes of unusual toughness, gloss, adhesion and chemical resistance, not only on concrete but also such widely different materials as metals, cloth, paper and wall tile.

Their alkali-resistance enables these finishes to be used over concrete, cement-asbestos, and alkaline wallboards without any special precautions. And because they do not fail by checking, upon prolonged exterior exposure, these finishes are particularly well suited for application on walls exposed to the weather. They possess, among their other qualifications: absence of odor, taste, and toxicity; extreme chemical inertness, good water resistance; excellent toughness and fiexibility; non-fiammability; good clarity; relatively high refractive indices; and resistance to age and weathering.

Cement Wo'l'er Paints

Some waterproofers incorporate cement in their composition. To this group belong the cement water paints, important members of the paint family. Usually, their base is Portland cement, scientifically combined with other materials to meet varying conditions, and available in various colors.

Although some white cement water paints, in their powdered form, may appear grayish, they are of dazzling whiteness when properly mixed with water and applied according to the manufacturer's directions. Cement water paints, either white or tinted, are used extensively on brick, concrete, stucco and stone surfaces, both on exterior walls and for the interior finishing of basements and other places which may have a tendency to dampness.

CLOSEUP showing the brush application with cement paint of normally porous concrete block. This will weather-seal it as well as improve its general appearance. Such paint is expected to have a surface life of eight (Photo caurfeiy of National Paint, Varm'xly and Lacquer Auor.)

1950-51 Theatre Catalog, 9th Edition, Page 138