The Detroit times. [volume] (Detroit, Mich.) 1903-1920, 1911-02-23

they shall have upper surfaces cor
rugated or ribbed. or they shall be
cast iron tread or platform shall All
be less than three-eighths (H)
Inches thick nor steel treads or
platform less than one-auarter
The Following construction may
also be used. viz: one and three
quarter u&D inch oak or other
hard wood treads supported by
angle or ct" irons running paral-
and nrmly secured tolchannei IRON
strings. The risers shall be FORM
ed OF rolled steel. not less
than three thfrty-seconds (3/32)
inches thick or cast iron plates not
inches thick and firmly fastened 10
the angle irons at top and bottom.
The clear space between the
angle or '.T' irons" supporting the
than two and one-half t2h)
Stairs constructed OF Reinforced
Concrete construction will be con-
sidered as Fireproof.
Sec. IL. RISERS AND THREADS.
For inside stairs. risers shall
never exceed or treads be less In
the various Glasses OF Buildings
than the following dimensions. UNI
less hereinafter allowed: Class 1.
~
Class 2, Treads 10 inches, Risers 7h
Glass 3. Treads sh inches, Risers
IN; Class 4, Treads 10h inches. Ri
ers. inches; Class s. Treads 1oh
inches, Rlsers z inches
Stairs In private residences, auxil-
larry stairs. and stairs In stables and
garages. less than three (3) stories
In height. may have less width tread
and higher risers than required by
the above schedule.
o.
OF STAIRwAYs. No stairway In
any building Except residences.
stables and garages under three
stories I'm height) shall be less
than two CD feet six SO inches
In width. The use OF winding ,s
All Public stairways with more
than eighteen Qs) risers to .
story. shall have q platform or
there shall not be less than three
CD risers between any two (2l
landings OF between any moor level
In ali Public stairway. Their.
un. DE o the nS e arsa: an the n. ssn.
between any two CD floors. and
all stairways shall have at least
seven CD feet perpendicular clear
headroom at all points.
nc ichktu VI inc piatAOEho VI
landings shall not be less than
the width OF the stairs. For en-
closed stairways. when doors are
placed at platforms or landings.
the length OF the platforms or
low an extra width OF the space
or two CD treads outside the door.
Sec. ls HAND RAILS. Stair
ways over three CD risers high
shall have substantial ratings on
the outside OF all stairs. landings.
platforms and well holes and all
lie Buildings. shall have In add
ton wall hand-rails.
The hand rails OF all stairs shall
be made OF solid wood. marble or
bustibls Material. the hand rail-
may be OF solid wood but Il must
have underneath IL and attached,
a continuous rail OF steel or iron
not less than one and ons-quar-
tsr, Nh S1eS inche'-oy on'-auart'r
Sec; q. STAIRS AND LAD
DERS TO SCUTTLES All build
ings having a scuttle In the roof.
shall have ladder or stairway
low and such ladder shall be sta
tionary or hung to the under side
Sec: Is. HALLS AND EN-
I than Psv. To al SSlSaos: 'ta s.
width OF the door openings at the
street OF alley levels, shall not be
less than the width OF the inside
stsirways leading thereto. and
use the outside doorways at the
foot OF the stairs. such doorways
must be increased In width at the
rate Of twenty (2o) inches for
every one hundred (1o0) persons
The exterior doors OF the build
ings OF Glass 4 and s and Of Man
ufacturing buildings OF Class 1.
shall open out, and shall not DO
locked during business hours or
ings the use Of flush bolts on
double doors Is prohibited. The
standing leaf OF double doors must
be fastened with ct" face bolts
operated at top and bottom by one
floor.
Doors shall not open inward ut
the foot OF any stairway OF the
above mentioned buildingsl
halls. clear OF hand rails. shall
not be less than the Width OF
Ali Entrance Halls shall lead
directly from the street or alley
or from a court connected with .
street or alley.
All Public Halls shall be thor
oughly lighted by means OF win
dows in exterior walls.
sT Ssf cE sTAIRs 4 xS .P. GoS ).
unlawful. under any circumstances
TO close up or to obstruot the stair
ways. Fire Escapes or approaches
thereto In any occupied building.
.tfucsion e of any p1 stairway e in Puzzle
or Semi Public buildings. shall be
made only with the approval OF
the Department OF Buildings.
Sec. 20. STAIRWAY ENcLos-
URES Where stairways are re-
quirsd to be enclosed such encios-
urss shall include such portion OF
the stair hall, necessary for the
proper return OF the floor landings.
The enclosures shall be made OF
OF Building in which they are
placed or as called for In this ar
tiole, and when made OF incom-
busttbls materials. they shall be
carried on independent foundations
stairway enclosures to be consid-
cred Fireproof must be built, OF
brick or concrete not less than
s. fns eo nsnss ' noa .. tile than ar
four ca inches thick or metal lath
and Gem ent plastar on steel studs
not less than one and three-auar-
tiers (1%) inches thick.
In Nom Flreproof Buildings OF
Glass 1, the enclosure OF stairways
may be stud partitions, plastered
on both sides. on metal lath. or
may be OF seasoned wood not less
than one and three-quarters (1El
inches thick, tongued and groovsd
and made tight.
ARTICLE XIII.
Fire Escapes.
Section 1. BUILDINGS RE-
CURING FIRE ESCAPES. Every
building over two (2) stories In
heighth in which two (2) or more
persons congregate for any pur-