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


than one and three quarters (iE)
inches thick. Where cast iron or
rolled steel are used for treads.
they shall have upper surfaces corr
rugated or ribbed, or they shall be
provided with safety treads. No
cast iron tread or platform shall
be less than three-eighths (h)
inches thick nor steel treats or
th) inch thick.
The following construction may
also be used. viz: one and three
hard wood treads supported by
angle or "T'' irons running paral-
lei with the length OF tho thread
and hrmly secured TO channel iron
strings. The risers shall be form
ed Of rolled steel. not less
than three thirty-seconds (3I32)
inches thick or cast iron plates not
less than three sixteenths (3H6)
Inches thick and firmly fastened 20
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 (2h)
inches.
Concrete construction will be con-
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: Glass;,
Treads 10 inches. Risers 7b inches:
Glass 2, Treads 10 inches. Risers 7h
Class 3. Treads 91t inches. Risers
tx; Class 4, Treads 10h inches, RI
ers inches: Glass 8. Treads 10h
inches. Risers 7 inches.
Stairs In private residences. auxil-
larry stairs, and stairs in stables and
garages. less than three CD 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 heighD shall be less
in width. The use of winding
steps is prohibited in all Public
Buildings.
All Public stairways with more
than eighteen us) risers TO a
story, shall have a platform or
intermediate level landing and
there shall not be less than three
go risers between any two Cd
landings or between any moor level
and a landing,
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
headroom at all points.
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 TO be increased to al
low an extra width OF the space
OF two ca treads outside the door.
Sec. 16. HAND RAILS. Stair
ways over three (3) 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 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 II must
have underneath IL and attached,
continuous rail OF steel or iron
not less than one and one-quar-
tteHr, OK, mh) inches by one-auarter
Sec. II. STAIRS AND LAD
DERS TO SCUTTLES All build
ings having a scuttle in tie. roof.
shall have a ladder or stairway
ttahihk lntTtlO IIOIfl lIc nOoA DCN
low and such ladder shall be sta
tionary or hung TO the under side
OF the roof
Sec. Is. HALLS AND EN-
FRANCES: To all buildings other
than Private Residences. the
width OF the door openings at the
street OF alley levels. shall not be
less than the width of the inside
stairways leading thereto. and
where occupants OF the first moor
Get Vo M ha
foot OF the stairs. such doorways
must be increased In width at the
rate OF twenty (20) inches for
every one hundred (1oo) persons
or fractional part thereof.
The exterior doors OF the build
ings OF Glass and 8 and OF Man
ufacturing buildings OF Class 1.
shall open out and shall not be
locked during business hours or
; during occupancy. In such build,
double doors Is prohibited. The
standing leaf OF double doors must
be fastened with "T'' 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
halls. clear OF hand rails, shall
hOt OC itSS NhC -
All Entrance Halls shall lead
directly from the street or alley
or from court connected with
street or alley
oughly lighted by means OF win
dows I'm exterior walls.
Sec 49, CHANGING AND con-
STRUGGLING STAIRS. IT shall he
unlawful. under any circumstances
60 ~ ~ mr. 20 OH Of he NJ
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
the Department OF Buildings.
Sec. 20. STAIRWAY ENCLOS-
URES Where stairways are re-
quired 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 In this ar
ticie, and when made OF incom-
bustible materials. they shall be
carried on Independent foundations
or upon the structural framing or
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 (1A) inches thick
In Nom ireproof Buildings OF
Class l, 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 GAl
inches thick, tongued and grooved
and made tight
ARTICLE XIII.
Fire Escapes.