The Detroit times. [volume] (Detroit, Mich.) 1903-1920, 1911-02-20

they shall have upper surfaces cor
rugated or ribbed. or they shall be
provided with safety treads No
cast iron tread or platform shall
be less than three-eighths (%D
inches thick nor steel treats or
PLATFORM less than one-quarter
The following construction may
also be used. viz: one and three
quarter AK inch oak or other
hard wood treads supported by
angle or ST. irons running para!-
lei with the length OF the thread
and nrmly secured 10 channel iron
strings. The risers shall be FORM
ed OF rolled steel. not less
than three thirty-seconds (3/32)
inches thick or cast iron plates not
less than three sixteenths (3HD
inches thick and firmly fastened 10
the angle irons at top and bottom.
The clear space between the
wood treads. shall not be greater
than two and one-half (2is)
inches.
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. un-
less hereinafter allowed: Glass 1,
Treads 10 inches. Risers ~ inches;
Class 2, Treads 10 inches: Risers ~
Glass 3. Treads si5 inches. Risers
IN; Class 4, Treads l0is inches. RI
ers inches: Glass 5. Treads 10ik
inches, Risers Z inches.
Stairs In private residences, auxil-
larry stairs. and stairs in stables and
garages, less than three CD stories
I'm height, may have less width tread
and higher risers than required by
the above schedule.
Sec. IS. RUNS AND WIDTHS
or STAIRWAYs. No stairway in
any building Except residences.
stables and garages under three
stories In heighD shall be less
than two CD feet six CD Inches
In width. The use of winding
steps is prohibited in all Public
All Public stairways with more
than eighteen (1S) risers TO
story. shall have a platform or
intermediate level landing and
there shall not be less than three
CD risers between any two CD
landings or between any floor level
and a landing
In all Public Stairways there
sions OF the treads and the risers
between any two CD floors, and
all stairways shall have at least
seven CD feet perpendicular clear
headroom at all points.
The length OF the platforms or
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
landings is 70 be Increased to al
low an extra width OF the space
or two CD treads outside the door.
Sec. l6. 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
stairways in Public or Semi-pub-
lie Buildings. shall have In addi-
ton wall hand-rails.
The hand rails OF all stairs shall
be made OF solid wood, marble or
metal. For stairs built OF Incom-
bustible Material. the hand rail
may be OF solid wood but Ii must
have underneath IL and attached,
continuous rail OF steel or iron
not less than one and one-quar-
ter az inches by one-quarter
Sec. II. STAIRS AND LAD
ings having a scuttle in tie roof,
shall have a ladder or stairway
leading thereto from the floor be-
low and such ladder shall be sta
tionary or hung to the under side
Sec. Is, HALLS AND EN-
FRANCES. To ali buildings other
than Private Residences. the
u
street of alley levels, shall not be
less than the width OF the inside
stairways leading thereto. and
where occupants OF the first moor
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 (100) persons
or fractional part thereof.
The exterior doors OF the build
ings Of Glass 4 and and OF Man
ufacturing buildings OF Glass 1.
shall open out. and shall not be
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 ''T'' face bolts
operated at top and bottom by one
floor.
Doors shall not open inward at
the foot OF any stairway OF the
above mentioned buildings.
In all buildings the widths OF
halls. clear OF hand rails, shall
not be less than the width Of
the stairs
All Entrance Halls shall lead
directly from the street or alley
or from court connected with
street or alley
All Public Halls shall be. thor
oughly lighted by means OF win
Sec 10. CHANGING AND con-
STRUGGLING STAIRS II shall be
unlawful. under any circumstances
to close up or to obstruct the stair
ways. Fire Escapes or approaches
thereto in any occupied building.
Changes In position and con-
struction OF any stairway In Public
or Semi-Public buildings. shall be
made only with the approval of
Sec. 20. STAIRWAY ENCLOS-
URES Where stairways are re-
CURED TO be enclosed such enclos-
ures shall include such portion OF
the stair hall, necessary for the
proper return OF the floor landings.
The enclosures shall be made OF
materials to conform to the Type
OF Building In which they are
placed or as called for I'm this ar
bustible materials. they shall be
carried on independent foundations
or upon the structural framing OF
the building
Stairway enclosures to be consid-
cred Fireproof must be built OF
brick or concrete not less than
eight (S) inches thick, tile or
reinforced concrete not less than
four (4) inches thick or metal lath
and cement plaster on steel studs
not less than one and three-quar-
ters CsD inches thick.
In Non-Fireproof Buildings or
CIaSS Il, the enclosure OF sldiTWdyS
may be stud partitions. plastered
on both sides, on metal lath. or
may be OF seasoned wood not less
than one and three-quarters (1Al
inches thick, tongued and grooved
and made tight.
ARTICLE XIII.
Fire Escapes.
Section I. BUILDINGS RE-
QUIRING FIRE ESCAPES. Every
building over two CD stories I'm
heighth in which two CD or more
persons congregate for any pur-
pose. or live. work or sleep. eX-