A treatise on architecture and building construction . e room through thespaces between the furring strips-, in cheap work this filling isomitted, the spaces being covered by the finished wood base. 8 MASONRY. 141 333. Very often the brown coat is put on immediatelyafter the scratch coat, without allowing time for the latter todry; this is known as green work. In such a case, the firstcoat is made very rich, while the brown coat contains a largeproportion of sand, and is worked into the first coat so as toreally form but one. While it saves time, this practice can-not be commended; it is much
A treatise on architecture and building construction . e room through thespaces between the furring strips-, in cheap work this filling isomitted, the spaces being covered by the finished wood base. 8 MASONRY. 141 333. Very often the brown coat is put on immediatelyafter the scratch coat, without allowing time for the latter todry; this is known as green work. In such a case, the firstcoat is made very rich, while the brown coat contains a largeproportion of sand, and is worked into the first coat so as toreally form but one. While it saves time, this practice can-not be commended; it is much better to allow the scratchcoat to dry before the brown coat is put on, although morelabor and lime are thus required. Another objection togreen work is that the excess of moisture causes the laths toswell badly, w^hich, in drying, shrink and produce cracks inthe plastering. Nearly all lime plastering is green work,unless otherwise specified. 234. Cornices are usually molded before the finishingcoat is put on; the operation of making them is about as. Fig. 106. follows: Longitudinal strips b^ h are first attached to thewall, as at b, Fig. 100, ox fg, Fig. 103 (?/-), on which the mold V 142 MASONRY. 8 guide runs. Sometimes a strip is also attached to theceiling, but more often the ceiling guide is merely a line, asdc. Fig. 103 {ii). The coarse stuff is made to conform tothe approximate profile with a muffled mold, that is, byforming a layer of plaster of Paris along the edge of themold, about \ inch in thickness, or an extended profile canbe cut out of zinc and attached, temporarily, to the correctmold. The mold is placed in position and pushed along theangle of the wall, as indicated in Fig. lOG. When the coarsestuff has been correctly profiled, the surface is coated withgauged stuff and carefully worked over with the correct mold,until an exact and perfect finish is obtained. The internal andexternal angles cannot be finished by means of the molds, butrequire to be carefully m
Size: 1610px × 1552px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bo, bookcentury1800, booksubjectarchitecture, booksubjectbuilding
