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1950-51 Theatre Catalog, 9th Edition, Page 139 (119)

1950-51 Theatre Catalog, 9th Edition
1950-51 Theatre Catalog
1950-51 Theatre Catalog, 9th Edition, Page 139
Page 139

1950-51 Theatre Catalog, 9th Edition, Page 139

A report of a committee of the American Concrete Institute published in the journal of that organization, includes these principal comments and suggestions: "Portland cement paints are suitable for use on exterior and interior Portland cement concrete and stucco surfaces excepting floors or other areas subject to mechanical abrasion . . . They are especially recommended where it is desired to decorate and reduce the water permeability of exterior walls built of porous, open-textured concrete such as concrete block masonry or where the concrete or stucco is damp at the time of painting or may become damp subsequently . . . The typical film possesses good decorative qualities as to hiding power and color. However, when wetted, as by rain, it becomes slightly translucent or darker and appears somewhat less satisfactory than when dry. However, on drying out, the film returns to its original color and opaqueness. Tinted paint films also assume a deeper color when wetted.

"Durability depends upon several factors including the composition of the

paint, texture and cleanness of the concrete surface, careful preparation of the surface, application procedure and the severity of the exposure. Based on information from several sources, it appears that Portland cement paints properly applied to exterior wall surfaces exposed to the weather may be expected to have a surface life of about eight years."

Generally, it is advised to defer painting of new masonry until efliorescence has become negligible. And for a good job, it is of first importance to users of cement water paint to read and carefully follow the instructions of the manufacturer. Otherwise, the user will have only himself to blame if he fails to obtain satisfactory results.

HYDRALT EMULSION is sprayed on foundation walls below grade, usually tollowed by an application at asphalt saturated membrane and then a second sprayed coating of emulsion. The protection course is a mastic made

Miscellaneous Items

Other products, mention of which is germane to any survey of waterproofing methods although they are not coating compounds, include: plastic floor tile, mortar sealants, and sealing adhesives.

Plastic Floor Tile

Plastic fioor tile, of course, offers decorative possibilities and wearing qualities not present in conventional waterproofing compounds. On the other hand, its installation may be more costly. One plastic floor tile on the market is available in some nineteen standard colors. This tile can be installed over any smooth hard surface, concrete, wood, metal, or tile. It combines a 3/32" top

surface of Tygon Plastic (the tough,

flexible plastic used by industry to protect plants and equipment from acid attack) with a 3/32" layer of synthetic impregnated cork, to form a fioor tile that combines toughness, fiexibility, quietness and resiliency. It is highly water-resistant, even immersing it in water will not affect its strength or appearance. It will not wet rot. It is supplied ready-to-lay in 8%" squares, 3/16" thick. While ordinary linoleum paste bonds the tile tightly to properly prepared wood or concrete fioors, a special waterproof adhesive is used where high bond strength is required. Maintenance is simple since the tiles smooth, nonporous surface does not catch dirt and can be wiped clean quickly and easily.

Mortar Sealants

One of the more specialized problems in the field of waterproofing is that of sealing the joints between glass blocks, which are, themselves, not porous. Ordinary mortar has been found unsatisfactory because it cannot form a good mechanical bond, and cracks develop from shrinkage in the mortar. Water is ab by mixing one part of cement with three parts of sand to a stiff mortar,


sorbed into these openings and when

this water freezes, it cracks the glass block.

To overcome this difiiculty, a mortar sealant was developed expressly for use with glass blocks. It coats the exterior mortar joints, adheres to the mortar and forms a tight flexible bond to the glass, expanding and contracting with the mortar as well as the glass without rupturing the film. It is of plastic-like consistency and can readily be applied with a caulking gun, or thinned down with suitable solvents for brushing. This sealant remains rubbery and bonds tightly to mortar, glass, tile, brick, metal and wood. It is available in white, and can be furnished in other colors.

Other Sealants

Other available sealants include: a sealing compound for spaces between wood, around window frames, lavatories, and wall-board installations, and an all purpose adhesive for binding different materials. Quick to seal and waterproof, this adhesive can be used on tile, metal, linoleum, wood, glass, wallboard, plaster, ceramics, most plastics, plywood, asphalt tile, insulation boards, and a host of other materials.


With so many waterproofing materials to choose from, the theatre operator can easily find one that suits his purpose. The question is no longer "How can I keep the dampness out?" but rather ffWhich waterproofer fits into my picture best?" Now that needless destruction by moisture can be eliminated easily, effectively and economically, the operator, once his material is selected, can take the offensive against rot, rust, mildew and decay; and in the dry days that follow sing "Moisture, stay ,way from my door."

then adding two parts of Hydralt Emulsion and sufficient water to make the desired troweling consistency. Such heavy duty waterproofing usually takes place during new construction. but is possible to apply to old structures. (Photo [0117/er of The Flimkate Company.)

1950-51 Theatre Catalog, 9th Edition, Page 139