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B D O 1 8 PAbQ A Plaster of Superior Strength and Hardness r EENE'S CEMENT is a white gypsum plaster or properties permit repetition of a piece many times in B cement named after the man who invented it the same mould. almost a hundred years ago, R. \V. Keene, an make Englishman. It has distinctive it unlike other plasters either in wcohrakirnagcteqruisatliictises whichArtificial Marble: Another important use is in the or physical make up. manufacture and setting of scagliola, artificial marble. Red Top Keene's Cement is laid down in slabs with Red Top Keene's Cement is approximately twice as color introduced into the wet material to produce the hard and strong as other types of gypsum wall plaster. color and graining of marble. The color effect is obtained It takes its set slowly and may be retempered (remixed in various ways, but the typical method of reproducing with the addition of water) after its set has begun with marble graining is to lay down on a casting slab or little or no effect on ultimate hardness. Because it is so table skeins of silk thread dipped in color. A surface different, Keene's Cement does not have the plasticity coating of Keene's Cement a scant quarter of an inch common to other gypsum plasters and does not change thick is then laid down over the color strands and the in plasticity or working qualities with age. latter withdrawn in the reverse order from which thev Manufacture requires a separate plant with special are laid down. The piece is completed by later applica machinery and processes. Gypsum rock for Keene's tions of Keene's to the back of the slab for thickness Cement is hand selected for size and purity and calcined and strength and by polishing and honing the face (the at very high temperatures to drive off virtually all bottom side as the piece is cast). water of crystallization. The calcined product then goes through special grinding processes and has added to it an agent to assist the setting process, a catalyser, rather than a retarder as is typically added to plaster. Scagliola making requires a high order of artistic skill, and of course this brief description gives no ade quate idea of the refinements practiced by modern shops. Good scagliola work can be distinguished from marble only by an expert. Used as a Base Coat Plaster: For base coat work Red Top Keene's Cemenc is mixed at the job with lime putty,hair or sisal fibre and sand and is applied directly over the lathing base much the same as other gypsum base coat plasters. Base coat work of this character has been somewhat limited; however it pro duces a wall finish of very high character. Cement From an architectural standpoint scagliola has a definite value because it permits reproduction of rare and inaccessible marbles and the manufacture of large monoliths such as columns too large to be cut from a single block of stone. Scagliola is usually more econom- V. ical than marble. plaster, wood fibre plaster and sanded plaster have been used for most base coat work, probably because of their Made From. Selected Rock: Red Top Keene's wide distribution and because they provide sufficient Cement is made at Southard, Okla., from the same gyp hardness and strength for virtually all base coat work. sum deposit that produces the finer grades of special gypsum plasters used by pottery manufacturers, dental AsaPlasterFinish:RedTop Keene's Cement is used extensively as a finish coat over gypsum base coat plas ters where unusual hardness and strength are required. laboratories and hospitals for surgical dressings. The unusual purity and whiteness of Southard rock make it ideal for the manufacture of Keene's Cement. Bathrooms, lavatories, kitchens, pantries, hallways and other rooms where walls may receive rough treatment are made more durable with a Keene's Cement finish coat. Of Proven Quality: Red Top Keene's Cement has been used in some of the country's finest structures, both for base coat and finish work, its quality and accessibil For Colored Plaster Finishes: Interior colored ity to dealers in mixed car shipments with other U S G plaster finishes are usually made with Keene's Cement. products have made it the accepted material in thou Red Top Keene's is mixed with hydrated finishing lime, sands of homes, apartments, hotels, office buildings and a graded white aggregate of marble or silica and mineral other structures throughout the United States. Its hard coloring. The color pigment must be thoroughly and ness and whiteness produce an ideal wall, one that can evenly mixed into the dry material before water is ad ded. be troweled to a glass-like smoothness and that can be (Because preparation of colored interior finish plasters re-troweled as much as desired to remove any imper is best accomplished by factory methods, manufactured fections of workmanship. Mechanics like Red Top colored finishes are recommended.) Keene's Cement for its uniform quality and the excellent results they are able to get with it. For Casting: Red Top Keene's Cement is used for casting ornamental pieces that require unusual hard ness. It is mixed, with water only and worked into moulds to produce a true uniform surface. Number I Moulding Plaster is preferred for most classes of orna mental work because of its working qualities and general suitability tor casting in gelatine moulds. Quick setting Keene's Cement is an inside material; it should not be exposed to the weather or run down to the floor line unprotected from mops and cleaning water. To make Keene's Cement washable it should be painted or ( enameled the same as any other plaster finish. As a wainscoting Red Top Keene's Cement is often scored in blocks four or five inches square to produce a tile pattern. B B O ie 3461 P-*S COPYRIGHT 1931. UNITEO STATES GYPSUM CO. M--?.Jt PRINTED IN U. S. A. Hand selected gypsum rock of exceptional purity and whiteness is used in the manufacture of Red Top Keene's Cement. Seville Apartments, Hyde Park, Tampa, Fla. Red Top Keene's Cement used as a plaster finish. RED TOP KEENE'S CEMENT RED TOP KEENE'S CEMENT Grounds for Metal Lath..._........................... to be 3/i inch Grounds for Wood Lath......_.......................to be % inch Grounds for Brick and Clay Tile Walls.-to be % inch Lathing: Wood Lath--To be a good grade of White Pine, Cypress or Spruce lath free from knots, sap or bark. Must be well nailed. Not less than four 3d com mon nails to each 4-foot lath, driven well home. (Double nailing should be resorted to on very particular jobs, especially if the lath are not up to standard in quality or condition.) Break joints every fifth lath; do not permit ends of lath to butt or overlap; leave at least J4-inch space between ends. Key or Clinch -- Lath to be placed inch to inch apart at sides and ends, on walls and ceilings. (Farther apart may mean loss of material--closer to gether may not allow for swelling of lath, thus causing buckling.) Preparation of Mortar: Sand--Use only clean, sharp sand free from loam and dirt. Screen through a six mesh screen for base coat and through a twelve mesh screen for sand float finish. Avoid quicksand. Lime Putty--First pour water into the mixing box, then add USG Hydrated Finishing Lime in the proportion of one 50-lb. sack to about 9 gallons of water, distributing the lime uniformly. If the mix is hoed thor oughly after soaking for about an hour, then allowed to stand over night, and hoed again before using, it will improve the spreading qualities. By forcing the lime putty through a }4-mch mesh screen with the back of a shovel the plasticity will be further improved. Mixing--Add sand to lime putty that has soaked over night, using more water as needed. For the scratch coat add the proper amount of hair as shown below. Dry mix the Keene's Cement in a separate pile with equal parts of sand. Then mix with water and hoe the two piles together adding sand to get correct propor tions. Dry mixing Keene's with sand avoids lumps. PROPORTIONS AND APPLICATION For First Coat on Wood or Metal Lath: For first coat on wood or metal lath use 400 lb. (4 100-lb. sacks) Red Top Keene's Cement; 600 lb. lime putty (6 50-lb. sacks) USG Hydrated Lime, and 2000 lb. ( yd.) clean, sharp, well graded sand; 1 bushel clean hair or sisal fibre (more as required). Apply scratch coat over wall surface, working into joints to form perfect keys. Cross rake or scratch thoroughly and allow time to harden before applying second coat. For Second Coat on Wood or Metal Lath or for First Coat on Brick or Clay Tile: For second coat on wood or metal lath or for first coat on brick or clay tile use 300 lb. (3 100-lb. sacks) Red Top Keene's Cement; 450 lb. lime putty (4J4 50-lb. bags) USG Hydrated Lime; 2700 lb. (1 cu. yd.) clean, sharp, well graded sand. Bring second coat to a true even surface and broom or rake lightly to receive the finish coat. Trowel Finish: 1. Medium: Use 100 lb. Red Top Keene's Cement, and 80 lb. lime putty (40-lb. USG Finishing Lime). 2, Hard: Bathroom and Kitchen Wainscots. Use 100 lb. Red Top Keene's Cement, and 25 lb. lime putty (1 12-qt. pail). 3. Extra Hard: Use Red Top Keene's Cement and add water only. Soak hydrated finishing lime to putty overnight. Form a ring of putty on the mixing board, add water, soak the Keene's until thoroughly wetted, then mix well with lime putty in the usual manner. Apply finishing coat thinly and evenly. Trowel with as little water as possible. Reduce suction of base coat by wetting as required. For Sand Float Finish: For Sand Float finish use 100 lb. Red Top Keene's Cement; 100 lb. lime putty (1 50-lb. sack USG Finishing Lime) and 400 lb. clean, floating sand of proper size. Soak hydrated finishing lime to putty overnight. Float to the required surface with cork or carpet float. Concrete Surfaces: Use USG Bondcrete--the base coat plaster for concrete surfaces. GYPSUM LATH and INSULATING LATH Use United States Gypsum Company's Cement Plas ter, Wood Fibre Plaster or Sanded Wall Plaster on Rocklath, Pyrobar Gypsum Tile, Red Top Insulating Lath and other fibrous types of lath. Note: Red Top Keene's Cement mixes may be re tempered as necessary. Setting takes place slowly and evenly throughout the mix, and retempering improves working qualities. UNITED STATES GYPSUM COMPANY ... CHICAGO BB018 2463