i +, Peo, THEYBUPDDING NEWS. 5, 1872. THE BUILDING NEWS. 273
to be soldered on for top sheets, just as men- tioned above for others. The other side of roof being also laid in a similar manner, and the wooden rolls all fixed on between the sheets, as per Fig. 56, the zine roll-caps (which I may here mention are generally machine-made) are then slid down over them, as per M, Fig. 57. But as these zine roll-caps are generally in_8ft. lengths, while the side SE roof is 15ft. deep, it follows that there must be a joint in each stretch of roll-capping, which joint is simply - made by slipping the upper roll-cap an inch or two over the lower one, and also soldering it. One nail or small catch put in under joint at top of each roll-cap is sufficient to hold roll-cap in its place, as, if properly put on, the zine roll-cap grasps the roll below it firmly. In order to allow zinc roll-caps to be slid on, a small bit of the wood of ridge may have to be cut out, but if so it does no harm, Where the work is properly done these zine roll-caps fit like a glove, both allowing the zinc underneath them to expand, and at same time holding it. After roll-caps are on the ridge must then be covered. It makes a very neat and trades- manlike job to put on a good lead ridge of
sheet lead, which can be nicely worked over all the rolls, and allowed to come down roof several inches, so as to give sufficient overlap. Fig. 6)b. or 7b. about 15in. broad, 58 shows perspective view of roof when finished. In the beautifully got-up and use- ful illustrated pamphlet on ‘ Zine as applied to Roofing Purposes,” issued by Messrs. Braby & Co., it is stated that Mr. H. G. Rein. architect to Canterbury Cathedral, had covered the cloister-roof with zinc, thirty-three years ago, with lead capping, and Tt had stood so well that he in- tended to use it further. This employ- ment of the ‘‘ lead-capping,” therefore, agrees with my recommendation here of lead for ridge. Another way to finish ridge would be one which I ae respectfully call the attention of architects and builders to, as it could easily be adopted and used for roofs which are covered with slates, to the great saving of the slates from breakages from the feet of sweeps or other parties who have occasion to walk along top of roof. Fig. 59 shows common sige of ridge, the centre- piece projecting up about 3in. or so above sides. In this case the wood being only about 1}in. or 2in. broad, and also round at top, parties walking along cannot very well walk on top of ridge, as at O, and so the feet are put down on each side, as at P P, thus perpetually causing the slates to be broken there. Now, if top of ridge at O were more flattened, aad also two strips of wood, about lin. thick and about 3in. deep, were taken and nailed on, one on each side
ae
as per QQ, Fig. 60, then
arties having occasion to be on roof could
easily walk along top of ridge R without
requiring to touch slates at all. To cover
this form of ridge where slates are used, the
zinc may be put on as per Fig. 61, the dotted
line being galvanised iron straps, put on every
2ft. Gin. orso. Or, another plan would be to put
on aflashing—either lead or zinc—on each side,
and a separate piece for top, as per Fig. 62.
Or, again, if we turn to Figs. 18 and 19, p-
199, the hook and eye system there depicted
—designated, ‘ Fox's Patent Underlock
Fastening, ” but which patent is now held by
Messrs. Treggon, Hickson, & Co.—may be
used ; the hooks being driven into each side
of ridge where the nails SS Fi ig. 61 are shown,
and the eyes soldered on to. inside of zinc
of ridge,
Cae
ridge ; or vice versa as shown at Figs. 18 and
19. It will be observed that the tops of ridges
and at R, Fig. 60, are not
flat, but that they are slightly convex, the
rise in centre in actual size of ridge being
Figs. 61 and 62,
fully Hin.; or, in other words, the top of the
form of ridge I am referring to is ap are of
a circle 14in, in diameter, of - which the chord
is 4in,
The shape and style of rolls given in this
and in the former article are, I perceive, not
included in the pamphlet ‘“« Zinc as applied
to Roofing Purposes,” issued under the aus-
pices of the architects and engineers to the
London manufacturing agents “of the Vieille
Montagne Zine Co.; but as I not only
highly approve of it inyself, but it also has
a fine appearance and makes a good job, I
could not do otherwise than show it as I have
done, more especially, too, as it has for some
time back been largely used. The style of
overlapping the zine on top of rolls eae
Fic.74-
Fia.73 aie i leet ae
Se ae
FUR fol Y
Ky | espe aiaen Ae w
ers"
Ww
ye __“.—
by dotted lines, Fig. 37, p. 212 (I may here
observe that as engraved at W, Fig. 37, the
zine roll-cap is shown as if it stood apart
from roll underneath it: but, in fact, it ae
upon it, and should therefore have been
shown closer to it) is the maximum for setting
up sides of sheet: butin thousands of cases,
and unless the customer wishes it otherwise,
the zinc at sides of sheets needs only to be
set up about half way up each side of all as
shown by Figs. 50 and 56 above. This is es-
pecially the case where there is a good slope,
and no danger from half-melted snow lying.
Messrs. J. & R. Fisher, the architects of
the Zine Co. above referred to, in a note
to me, recommend the style of roll shown by
Fig. 63, which is certainly very plain, and
mh I will admit may, perhaps, be a little
cheaper at first cost and easier to put on than
the style at Fig. 50; but I can hardly admit
that : either enaken a better job or looks
so well.
However, where there are many men there
are many minds, so there is plenty of scope
for both plans. Fig. 63 is known as the
“ French Plan,” and if there be no objections,
Fig. 50 might be called the British Plan.
Another plan of roll is that shown by Fig.
64, with fine zinc clips 2in. broad, in the
length of sheet put under wood roll and
turned down as shown. ‘This appears to me
to be an improvement upon Fig. 63, but to my
mind it could be greatly improved vy being
rounded at top and also contracted a little
more at bottom, which would enable zine roll-
cap to take a firmer hold of roll, and also
PIONS WOOK WW
eal 4 Fac. Hi Flaws suit the purpose better. The style of Fig. 63 also requires zinc clips put under wood- rolls, as shown in Fig. 64; none such are re- quired for Fig. 50, as the "sty le of wood-roll renders them 1 unnecessary. The style of roll and shape of roll-cap at Fig. 50 are also un- favourable to capillary attraction having scope. Fig. 65 shows ‘ Patent wood- roll with zinc drawn over by machinery.” It is Yin. high, and 23in. broad. I cannot say that I consider this style any improvement upon Fig. 64; it is, however, a variety. In Fig. 65 L would be afraid of snow or heavy rain being blown in at sides of roll, and so rotting the w wood, especially where the roof was very flat. In*the foregoing styles of laying zine it will be understood that the roofs under zinc are boarded—~. e., that the zine lies on boards. In what is known as ‘ Italian corrugation,” no boards are used, wooden rolls 3in. deep, by 1$in. broad, being put in every 1ft. 3in., centre to centre, and ‘purlins fixed every 10ft. or so. The overlap at top and bottom of sheets is about 4in., and the serew-nail ought not to be put in through both sheets. Fig. 66 is section of this style. The fold in Fig. 67 is an improyement upon the mere overlaps
