The Detroit times., 1911-02-21

than one and three quarters 1E)
inches thick. Where cast iron or
rolled steel are used for treads.
ruEatsd or ribbed. or they shall be
provided with safety treads. No
cast iron tread or platform shall
be less than three-eighths (A)
inches thick nor steel treads or
platform less than one-quarter
tAl inch thick.
The following construction may
also be used. viz. one and three
hard wood treads supported by
angle or ST. irons running parai-
lei with the length or the thread
aud hrmly secured TO channel iron
strings. The risers shall be form
than three thirty-seco tsIs2)
inches thick or cast iron plates not
less than three sixteenths (3Hs)
Inches thick and firmly fastened 10
the angle irons at top and bottom.
The clear space between the
angle or 'T' irons" supporting the
wood treads. shall not be greater
than two and one-half (2Is)
Stairs constructed OF Reinforced
sidered as Fireproof.
Sec. IA. 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: Class I,
Treads 10 inches, Risers tx inches;
Class .. Treads eh inches. Risers
TN; Class 4. Treads 10h inches. Ri
ers Z inches: Class s, Treads 10h
inches. Risers inches.
Stairs In private residences, auxil-
iary 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.
Sec: 10. RUNS AND WIDTHS
OF STAIRWAYs. No stairway In
any building Except residences.
stables and garages under three
stories In height) shall be less
than two CD feet six tO inches
steps is prohibited in all Public
All Public stairways with more
than eighteen us) risers to
story. shall have a platform or
there shall not be less than three
(3) risers between any two CD
landings or between any moor level
In ali Pubic stairways there
shall be no change in the dimen-
sions OF the treads and the risers
between any two (2) floors. and
all stairways shall have at least
seven Cd feet perpendicular clear
The length Of p the platforms or
landings shall not be less than
the width OF the stairs. For en-
closed stairways, when doors are
PA Ssn at platforms 5n or ,, isnding
landings Is TO be increased to al
low an extra width OF the space
OF two CD treads outside the door.
Sec. 16. HAND RAILS. Stair
ways over three CD risers high
the outside of all stairs. landings.
platforms and well holes and all
stafrways In Public or Semi-pub-
lie Buildings. shall have In add
ton wall hand-rails.
be made OF solid wood, marble or
metal. For stairs built OF Incom-
bustibls Material. the hand rail
may be OF solid wood but II must
a continuous rail OF steel or iron
not less than one and one-quar-
Ter ,n1 inches by one-auartsr
Sec. II. STAIRS AND LAD
tngs 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
os ,S or hung to the under side
Sec. Is. HALLS AND EN-
FRANCES. To all buildings other
than Private Residences. the
street Of Of all alley 1I levels I 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
must be increased in width at the
rate OF twenty (20) inches for
every one hundred (1oo) persons
or fractional part thereof.
ings OF Glass 4 and and of Man
ufacturing buildings OF Class /.
shall open out. and shall not be
locked during business hours or
ns rns the u!s of a.h sus Sot su 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
handle at a convenient height from
floor.
Doors shall not open inward at
the foot OF any stairway OF the
above mentioned buildings.
In all buildings the widths Of
not be less than the Width OF
the stairs.
Ali Entrance Halls shall lead
directly from the street or alley
or from a court connected with q
All Public Halls shall be thor
oughly. lighted by means Of win
dows in exterior walls.
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 or
the Department Of Buildings.
URES. Where stairways are re-
quired to be enclosed such enclos-
ures shall include such portion OF
tho stair hall. necessary for the
The The enclosures Us ' snail n0G be made Of
materials to conform to the Type
of Building in which they are
placed or as called for In this ar
ticle, and when made OF incom-
bustible materials. they shall be
carried on independent foundations
or upon the structural framing OF
the building.
stairway enclosures to be consid-
brick or concrete not less than
eight (sl inches thick. tile or
reinforced concrete not less than
four 90 inches thick or metal lath
and cement plaster on steel studs
not less than one and three-quar-
tiers (1&) inches thick.
In Non-Fireproof Buildings OF
Class i, 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 OK
inches thick, tongued and grooved
and made tight.
ARTICLE XIII.
Fire Escapes.