BLTC Press Titles


available for Kindle at Amazon.com


The Characters of Theophrastus

Theophrastus


My Man Jeeves

P. G. Wodehouse


Mortal Coils

Aldous Huxley


Novalis Including Hymns to the Night

Novalis, George MacDonald, Thomas Carlyle


Molding and curing ornamental concrete

by Albert Allison Houghton

Excerpt:

This may be cut in sections or remain in one entire section, as the worker may desire for convenience in storing. The work is easily removed from the mold in either case. The inside of the plaster or concrete mold for rim should be treated to two coats of shellac, so to give a smooth molding surface. When the completed mold is assembled, the outside form will rest upon this plaster mold for rim; this is usually filled with the concrete mixture for bath tub before the outside mold

is placed upon same, thus insuring that the rim will be perfectly molded.

Another style of mold for rim is shown in Fig. 4. This may be used upon tubs where the ends are constructed in the form shown in illustration, also as a rim mold upon the square style of concrete bath tub.

The mold is easily constructed by cutting strips of cove or scotia moulding, to join* in the manner shown in the illustration at Fig. 4. The two concave sides of the moulding are joined together, so to make the semi-circular channel for the rim, the largest size of cove molding will be necessary so to give the rim a width of at least 2y4 inches. The height of the rim may be changed by planing off the top of the wood molding, if that is considered desirable.

The wood mold for rim must be well coated with shellac and also given a coating of oil before the work is molded, so that the wood will not absorb the moisture from the concrete, and also to prevent the concrete from adhering to same and thus spoiling the cast.

The mold for rim should be in several sections, so to be the more easily removed from the molded work. These may be held together when molding the tub by strips of strap iron fastened with screws, as explained for the outside sections of bath tub mold; or the sections may also be fastened together with hooks and eyelets upon the

outside, or by blocks of wood nailed to the molding board along the outside of rim mold.

THE PLASTER SYSTEM OF MOLDING

The plaster system of molding a concrete bath tub, as illustrated in Fig. 5, is practically the same as that employed for the method shown in Fig. 2, with the exception that the outside form is not used. The concrete mortar or stucco is plastered upon metal lath, which are placed over a core form, to aid in holding the lath into position against the pressure of applying the plaster.

The wire cloth or expanded metal lath are fitted together to conform to the outline of the bath tub, then placed over the core form and the stucco applied; when the concrete is sufficiently hardened, the work is turned over and the core form removed; then the inside of tub is given a plaster coating of cement mortar, if needed. Usually the mortar may be pressed through the wire lath and up against the core, so to make the inside plastering of the work unnecessary.

This system of molding makes it possible to produce a bath tub that is far less in weight, with ample strength for the purpose than when produced in molds. By having a number of core forms, the worker can perfect as many tubs each day as he may have time to complete, as there is not the necessity of waiting for the concrete to harden before the outside form is removed.

MOLDING THE SQUARE STYLE OF BATH TUB

The simplest style of molded bath tub is shown in Fig. 6. This requires a simple box form for the outside centering, or mold to the tub, which is ornamented by panels.

This style of tub is usually molded in the position it should occupy, as its weight does not make it possible to be moved very easily. To mold this upright, the core must be suspended in the proper position by strips placed across the top of the outside molds, and the concrete poured or tamped around core. By placing the concrete for the bottom of tub first, before setting the core form in the center of mold, the perfect molding of the bottom is assured.

The sides of tub may be ornamented by molding panels of concrete of a contrasting color to that used in the body of the tub, and then inserting in the outside molds at the proper point, thus producing an excellent appearance to the completed work. The panels to be imbedded into the concrete may be molded with a smooth, glossy surface, so to reflect light, by using glass slabs in the bottom of mold for panels, thus producing a very smooth surface to the molded panel. This method is fully described in No. 5 of this series on MOLDING AND CUEING ORNAMENTAL CONCRETE.


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