Ruberoid contains no rubber, tar, or asbes tos, and is declared to be not an asphalt com pound. The claims made for it as the basis of its efficiency, are that it is not only impervious to water, but indestructible by acids, alkalis, or gases, and continues to retain its flexibility and other, characteristic properties under the se verest changes of moisture and temperature.
Saltsproofing is the proprietary name given to a colorless liquid compound which, on appli cation to exterior walls of concrete, stone, or brick, penetrates to the depth of one-quarter inch or more, filling the pores with a substance which, it is claimed, forms an impervious bar rier against the passage of water, prevents efflorescence, and will not flake or scale off. Esco waterproofing, it is claimed, is similarly effective on interior surfaces. Both, however, may be used on either exterior or interior work.
Sarco Method of Waterproofing. This method is essentially that of applying a protective bitu minous coating upon the surface of the concrete when dry. The compound sold under this name is claimed to form "a perfect, indestructible union with the surface of the concrete; to be itself impervious to the action of all natural de structive forces; and to be acid- and alkali-proof, and unchangeable in character from time or exposure." It is described as "a pure hydrocar bon, analyzing 99.7 per cent pure bitumen, and having a range of ductility of over 200° F. In other words, between the point in temperature at which it becomes brittle and susceptible to fracture, and the point at which it softens suffi ciently to move, there is a range of over 200° F." These temperature figures far overlap the widest ranges of summer heat and winter cold, so that the product is claimed to provide adequately against all dangers arising from cracks or checks which may develop as the result of expansion or contraction.
Sartac differs from Sarco in being a non drier, remaining tacky so that plastering is ap plied directly over it. It is intended for water proofing the interior surfaces of stone, brick, tile, or concrete walls, and is applied cold with a brush.
vents not only the inlet of moisture, but also the egress of soluble salts, with their disfiguring effects of efflorescence. It is also claimed to be effective in preventing stable lodgment of dust and grime of every description, any surface to which it is applied being easily cleaned and kept clean. Eight ingredients enter into its com position—three whose function is to clean the pores, and five others which are used for making the mineral substance soluble and holding it in liquid form until applied. Its capacity for waterproofing is from 85 to 125 square feet of brick or concrete wall per gallon, depending on the porosity of the structure.
The wall finishes are manufactured in all standard colors, and are claimed to combine the advantages of durable, attractive finish for in terior walls of brick or concrete with those of an efficient damp-resisting filler. Their action overcomes absorption by filling the pores with a mineral pigment.
The cut stone backing, claimed to be proof against water, acids, and alkalis, is used for coating the unexposed sides of cut stone, to pre vent staining due to the absorption of moisture from the usual brick backing.
The liquid substructural cement is a bitu minous, product of heavy consistency, applied cold. It is adaptable to substructural work un der earth filling where hydrostatic pressures are only moderate, as in ordinary basement and cel lar foundations and floors. The coating should be run continuously over the cellar floor before the finish coat of cement mortar is applied. Bur lap saturated with this product should run through the wall so as to insure a continuity be tween the floor coating and the membrane on the outside wall.