212 THE BUILDING NEWS. - Maren is 1872.
Im this article the style of using sheet
zinc in place of lead is to be described, and
for illustration I shall take a flat 17ft. long
by 15ft. broad, with a raised division run-
ning up its centre. Fig. 34 is section of
such flat, P being square wooden block or
frame, 3in. broad and 3in. high, running up
the whole length of flat. Instead, how-
ever, of supposing this flat to be situated
upon the top of a “hipped” roof, with four
trapezoidal inclined sides,’ as was flat in
former article, I shall suppose it to be
bounded at ends by two gables, in which
case Fig. 35 shows longitudinal section as
distinguished from longitudinal section shown
by Fig. 25. The first thing to be done here
is to nail on a long narrow strip of sheet
lead 17ft. long by 4in. broad all along front
of flat on each side just as is shown by Z,
Fig. 23, then to cover slates put on the two
flashings—whether lead or zine—one on each
side, as shown by dotted line, Fig. 23. Then
bend down top half of lead strip, which is to
form “clinch,”* as per Z, Fig. 24, and then
plane its edge straight. Provision must now
be made for laying down the zine on top of
flat, but it must be understood how wide the
sheets are to be. As the general size of zinc
sheets is Sft. by 3ft.t, we shall take that as
the size to be used here, and as Tin. is to be
taken up by portion of each side set up, that
leaves breadth of sheet lying on flat to be
2ft. 5in., and as flat is 17ft. long it will take
up about seven such breadiths in its length.
In order to lay the sheets as regularly as
possible, the first one—after one side has
been set up 4in., and the other side din. high
—amay be placed in centre of flat, as at Q,
Fig. 35, then all up each side wooden rolls
are to be nailed on, of which Fig. 36 shows
full-sized section suitable for 2in. zinc roll
caps; this wood roll is 1iin. broad, and
about 28in. high over all. This wood roll,
which extends from central division block to
edge of flat, need not be made all in one
piece, for it may be made and fixed on more
readily in two pieces by making portion be-
low dotted line of a separate piece, and nail-
ing it on first, and then nailing the larger
piece on above it afterwards. We shall take
this latter plan, and nail on a in. by din.,
piece all up each side of Q, Fig. 35; then, at
a distance of 2ft. 5in. + in. from each side
of Q, nail on other two of these pieces as at
RS, Fig. 35, and at a similar distance nail
on other two pieces, as at T U, Fig. 35.
All these pieces, or wooden strips, are each
7ft. 44in. long. When they are nailed on,
and the seven sheets of zinc laid down in
their site with the top ends of all next cen-
tral block, or division frame P, Fig. 34, set
up Sin. high (which it will be understood is
independent of the one side being set up 4in.
and the other side 3in. high), the principal
portion of wood rolls—yviz., that above dotted
line, Fig. 36—is then nailed on; but to nail
it properly a gimblet ought to be used to
bore through wood-roll first, which causes
the nail when driven down to go in where
wanted. Either nails or screws may be used
about Shin. or 4in. long. The zine is then
brought over rolls as per dotted lines, Fig. 37,
the 4in. upstand of one side overlapping the
sin. upstand of other side asat VV.
While putting on these sheets the end of
zine next central block, P, Fig. 34, has to be
soldered at corners. The side of zine with
sin. upstand should be soldered first, then
the 4in. one, which overlaps it, and it must
be an axiom with the plumber not to solder
two different sheets together, but to keep
each sheet by itself.
in soldering zine diluted muriatie acid, or
“spirits of salt” is used. In the Family
- [ recommend a /ead strip for clinch because when
lead ig used the clinch lies closer, and a better and neater job is, therefore, made, + “Sheet zine is always attainable in sheets sft. and 7ft. long, by 3ft. and 2ft. Sin. wide, but it may be rolled of any length under 12ft. For specially rolled sheets about ® month's notice should be given, and for lengths over 10ft. an additional cost of about £2 per ton is incurred for rolling."—From printed circular of Vieille Montagne Zinc Mining Company. =
Herald for March 2, 1872, I find it stated that in preparing spirits of salts for solder-
ing it requires to stand several days ina | bottle after the zinc has been put into it, and
also to be shaken up every twelve hours; but that is simply a mistake, as the mixture does not require to stand even twelve minutes. In practice, the plumber pours a little of the “‘spirits ” into a small dish, say a saucer, a jelly-can, or a lead dish, set up as per Fig. 6, p- 170, about 6in. square, and say 2in. deep, then some small pieces of zine are put in, and in a minute or two the mixture is ready for use. I have just made a trial of a mix- ture called ‘“ Baker’s Preparation for 'Tin- ning and Soldering ;” but I find the specimen I got not to be equal to the spirits, especially when applied to old or tarnished zinc, neither did it clean the soldering-bolt half so well. The acid, as I have said above, is diluted by dissolving a little sheet zinc in it. When the zinc is put in among the acid a violent ebulli- tion sets in, which, however, soon subsides. If alight be put to it during ebullition the gas given off will go on burning for a short time. The soldering here is done by means of copper bolts. Theacidis put on with a small piece of cane or a small brush. The front edge of zinc sheet has then to be clinched, as shown by K, Fig. 28; only before doing so about 1}in. has to be cut off end of sheet, it being in this case that much too long. The portion of upstand projecting beyond K is also cut away, so as to allow zine to be turned in. The zinc being turned in, as per K, is then to be bent down as per L, Fig. 29; but as zine will not work down at the corners in the same manner as lead, the upstands have first to be slit down close by end of wood-roll to allow zine to be bent down. When clinched and bent down as per L, Fig. 29, a small piece of zinc has to be inserted and soldered to each front corner of zine sheet, and so soldered as that each sheet is kept distinct and by itself. The size of this small piece is about 2in. square. The two front corners of each sheet, there- fore, project out before butt end of wood- roll fully 14in., as per Fig. 38, the depth of projection being about 3iin. over all. The zinc-roll caps have then to be slid on as per outer circle at W, Fig. 37, and in order to protect front edges of zinc sheets projecting in front of wood-rolls a short piece of the zine-roll—about 43in.—has to be taken and put on perpendicularly, being first mitred with front end of horizontal zine-roll, and then both soldered together at mitre. The inner edge of this short perpendicular piece of zine-roll is to be kept about Jin. back from front edge of flat, just as bottom of horizontal zinc-roll is raised a little above flat. Fig. 39 (which is drawn on a smaller scale than Fig. 38) shows the roll- cap on, Fig. 38 showing it off. The end of zinc-roll which is next, or comes up against central block P, Fig. 34, has a small piece of zine soldered round it, over which the apron of saddle comes, so as to make all properly watertight. ‘The sides of zine sheets which are next gables are bent up about Sin. high, and an apron put on as per X, X, Fig. 35. A pailful of clean water and a brush should then be got, and the whole of zinc brushed over, so as to clean off all spirits of salt stains, &c.—in fact, the water and a small brush should be there all the time. The one side of flat being covered as above described, the same is done to the other side of flat, and after saddle is put on the work is finished. This ‘ saddle” is put on as per Y, Fig. 40, the dotted line showing section of lead. ‘The saddle Y, here shown, it will be understood, rests upon P, Fig. 34, P being also represented here as supporting Y. The wood for this saddle is 17ft. long (the length of flat), 5in. broad, and about lin. thick. After it has been nailed on, and covered with lead about 1ft. broad, as per dotted line at Y, the plumber work of flat is finished—i. e., unless plumber has also to ‘‘point” the raggles with mastic or cement, which ‘ pointing” in some places is left for the slater to do. Al- though I have mentioned lead as the material to be used for saddle, yet, if preferred, zinc may be used, and put on inridge style. The
