Every evening, Wilmington daily commercial., 1906-01-27

Pc ,-..,tion During Construc ton, But
70 ~ ~ rests, in Accordance with the
amer Completion
,;.l attention is given 10 ireproof
sPrnction in the new building ordi-
ls.' now pending before City Council.
l', EARN areproof construction as used
~ ordinance. is to apply to all build
'' :, which all parts that carry weights
Grains are made of incombusti-
..ierisls which are water and fire.
or which. if not Of themselves pos
,si W. of these qualifications, are covered
n rroiected by fire and water proof
..,Iials. which are slow heat conduc-
and SO secured in place as not to
l.i,Jga bv the effects of fire and water
~ oytreme circumstances. IL is pro-
.5oJ however, that any metallic or
H. ;ncombustible decoratice material
.s3 need not be covered.
When the principal structural parts
of Steel or any other material Of suf-
Ssnt durability in accordance with
ii regulations, every part OF such
.r,cture must be securely covered with
:. spd water proof material, which shall
t,.srd nj least wo inches outside Of the
,,.t projecting parts of such eonstruc-
=. materials. whether it is used as an
iltional structural member or placed
IN protection only.
In freproof buildings OF door or win
,r millions. whether vertical or hori-
.risl they must be faced with a cast
,on terra Gotta or other incombustible
rsierjal of equal fire resisting values
4 rire and water proof coverings must be
,iiroly incombustible and slow heat con-
n,tors The materials which viii be
e,.iiered as filling the conditions of fire
roof coverings are; First, brick; second,
o,ops terra Gotta, which shall be al
,ast wo inches thick if hollow, and not
ID than one and one-quarter inches
Ibiek II solid. and this shall be applied
reet 10 the metal in a bed Of mortar;
lind. semi-porous terra Gotta not less
Ian two inches If hollow and one and
rn,.balf inches thick if solid; fourth
isnse hollow tiles or burnt clay at
al two inches thick applied to the
netal in a bed Of mortar and constructed
such manner that there shall be an
m space Of at least three-quarters Of an
r,h. each. by the width Of the metal sur
sos to be covered within the clay cover
ne, fifth, freproof concrete as prescrib
d. sixth, plastering on metal iaths.
Freproof floor arches may be made as
Bellows:
lAl Brick arches-If arches are Of
rck and of sufficient skew back they
ray be unlimited in span. If the brici
irch Is segmental. the rise shall not bl
lsss than one twelfth of the span and no
ess than four inches thick at the crown
b to six foot spans, nor less than eigh
inches for spans up 10 twelve feet. Ihl
lfthes shall be composed of good, har'
brick or hollow brick of ordinary dimen
lons, laid to a line on the centres properl.
'sni soldly bonded, each longitudinal lin
ri brick breaking joints with the adioin
be lines in the same ring, and with th
ng under it when more than a four mc
ph is used The brick must be wei
get, the Joints filed in solid with cemen
Hortar, and the arches well grouted an
uperly keyed.
Bl Tile and terra Gotta Arches
hollow tile OF porous terra Gotta archie
iie used they must be of uniform densit
sld hardness Of burn; the rise shall no
b less than tenth of the span nc
gss than four inches up TO five feet, no
isss than six inches at the crown OF spa
l 70 ten feet. In tile and terra cott
iTches the joints must be solidly file
With cement mortar, as required Of con
hrfn Ha fIaH
lIucted that the key block shall alway
iil in the centre portion. The shells an
webs Of all end construction blocks mus
ihut one against another.
lCl Concrete brick arches-Concrel
tIick arches shall be set and laid as spec
ned for brick arches under division A
ne rise shall not be less than one-nint
ihe span, with four inches thickness
g ne crown for spans up TO six feet an
tght inches for spans not exceeding Z,
ieet If vousoir arches are used.
# iDl Monolithic arches-Monohth
concrete arches shall, in all cases. be J.
enforced and protected on the under sil
WIN corrugated or sheet steel, steel ril
q metal in other form, weighing not le
usn one pound per square foot. ~
thickness at crown shall not be less thi
one'hiteenth of the span, but not le
han four inches, nor shall any span e
oed ten feet.
w All floor arches are to be filed /
sVel with the top of the crown wi
roItand concrete and all tie rods al
ue'al structural bearing surfaces shall
covered with covering not less than ty
inches thick.
freproof floor construction made
Nlia Gotta OF tile finishing with a a
elllng shall have the tie rods within t
;Osef third of the height Of the suppoi
lg beams, provided the same are
ssafer than two inches to the sofiits a
we spans are limited as prescribed.
a. Porous and semi-porous ter
"sa-lf Of side construction the span
n nat arch shall not exceed eight tim
rs elective depth of the arch measur
Upward from the lower flange, but n
.sl ten times for end construction
jrsh When the skew back of a 81
obstruction is nodded TO and is not l.
.ah Two inches below and joints on {
s.a.ie Of the lower flange, the span m
elght times the total depth Of I
~, but not over twelve feet.
VI Dense tile-The span Of side a
t# |'