The Detroit times., 1910-10-05

(S6xSo . wall or must have
aPRls csssl frame aneheers y. sRR = :.
ana Enown g Ashlar shall not Be
loso than four 90 inches thick.
stone Ashlsr shall be anchor
Cd g the Decking. and and the backing
make the walls, Independent OF
Ashlar, conform In thickness with
the rsouirsmsnts Of this ordi-
should the Ashla. be not les.
Sond.S d's into x. Sacsins i i ma aS
ness ne so ~ sSs w. w.i Rar' OF the 'n''A
Iron Ashisr pistss used in
up With the same thickness of
brickwork ~ required for brick
wall without Ashiar.
All projecting courses Of
stone must have suficient bear
s4ssv is .s .as. ss 5,as S'n issAs g:
Sec. :. WALLS AND PIERS OF
COURSED STONE. Where walls or
outside piers are built OF coarsed
vertical Joints. SUCH walls or piers
may be built OF a less thickness than
the specified brickwork. provided the
crushing strength Of the stone II
greater than the brick. but in no
.a .a' e p .; h Be- sis sns.
provided for brick work.
Sec. Z. LED0ES. In buildings
OF Glasses !, Z and s when OF "Ordi-
nary" or MIL" construction. bear
Ing walls sixteen !ie) inches or less
In thickness shall have corbelled
brick lodges projecting at least four
90 inches to carry the ends OF joints
or beams.
In buildings of Classes Q and 3
and Of similar construction. and hav-
the Joists and beams shall not ex-
tend more than four CD inches into
Sec. 8. PARTY WALLS. Party
walls between buildings belonging to
four "a inches more in thickness
than required for bearing walls.
Party walls between buildings be-
longing to the same owner and
erected at the same time shall not
be less In thickness than required
for external bearing walls.
All openings In party walls shall
have regular underwriters' standard
fire resisting doors on each side Of
Sec. .. DIVISION WALLS. In
-
win be required as follows: When
In Ordinary construction" any In
dividual moor space exceeds 5000
square feet. In mill construction"
$4,000 square feet. In protected" or
square feet. The walls when ''I re.
Quired shall be OF the thickness
given In the table, and all openings
In the walls shall have regular un-
derwriters standard fire resisting
~ - -
Buildings so divided shall be treated
In regard to stairs and fire escapes
as two or more separate buildings.
Sec. 10. PARAPET WALLS.
Parapet walls OF brick. not less than
IL inches thick. covered with wealth
er proof coping Of incombustible ma
terial. and extending at least one
foot six inches above the roof Of
buildings not over three stories high
and three feet for buildings more
than three stories high shall be
roofs are fiat. where the roofs abut
against other buildings. or the
building stands on any lot line; also
over division walls between separate
buildings or over division walls Of
lines. II the main walls are finished
with incombustible corners or gut
tiers at roof line, or II the tops OF
the roof boards and roof joists are
protected against fire for a distance
OF at least Ave feet from such street
or alley lines. by q coat Of deafen-
ing mortar on hollow or porous tile.
at least two inches thick, or II the
entire frame material OF tho roof
shall be made strictly IRE proof.
parapet walls may be dispensed
with.
Parapet walls facing upon courts
may be treated the same as walls
facing upon streets or alleys.
Sec IL. BEARING WALLS WITH
OPENINGS. II a horizontal section
through any part Of q bearing wall
In any building shows more than
thirty (30) per cent area Of fiues and
opening. such sections OF wall shall
be increased four az inches In thick
ness for every fifteen Q6) per cent or
fraction thereof OF flue and opening
area In excess OF said thirty (30)
Sec. ~. CURTAIN WALLS. In
skeleton construction freproof
buildings the inclosing walls OF
which do not carry the weight OF
floors or roofs. curtain walls may
be used. II not less than IL inches
In thickness. Such walls shall be
where they rest on q beam or col
umn must be OF sufficient strength for
this purpose without reliance on the
wall below. All curtain walls must
be Of incombustible material and be
subject to the same provisions af-
fecting other external walls, and
they shall be bonded to the mate
rial enclosing the vertical members
In the skeleton. Should any curtain
wall be more than so feet high
between the supporting horizontal
beams. all OF the wall below the 60
feet shall be Increased In thickness
at the rate of four inches for each
so feet or fractional part thereof in
height
All curtain walls must be OF in
combustible material, as specified for
external walls, and shall be subject
etc, and they shall be bonded to
the material enclosing the vertical
members In the skeleton.
No twelve (12) Inch curtain wall
shall be more than sixty (60) feet
high between the supporting hori-
xontal beams and should any such
curtain wall be more than sixty (6o)
feet high, the upper sixty 900 feet
only shall be twelve d2) inches
thick. while all walls below this six
~ 900 feet shall be increased four
20 inches In thickness for each sixty
600 feet or fraction thereof.
Curtain Walls supported at In
tervals OF not over thirty (so) feet
may be twelve t12) inches thick for
the upper ninety 600 feet In height
and increased four 90 inches I'm
thickness for each additional one
hundred u00) feet or fraction there
Of.
Curtain Walls supported at inter-
walls of not over fifteen u5) feet
may be twelve Q2) inches thick for
the upper one hundred and twenty
feet 026) feet In height and fncreas-
ed four 90 inches In thickness for
each one hundred Q00) feet or frac-
tion thereof.
In buildings OF reinforced concrete
where the columns are built REIN
forced and OF full strength and car
rying capacity. az called for In this
ordinance. the walls between coll
umns may be curtain walls, built as
called for In this section.
Sec. Is. APRON WALLS. Apron
WRllA may be built eiRhf I2l inches