The Detroit times. [volume] (Detroit, Mich.) 1903-1920, 1911-02-21

than one and three-quarters 1E)
inches thick. Where cast iron or
rolled steel are used for treads.
they shall have upper surfaces COR
rugated or ribbed. or they shall be
provided with safety. trsads. No
cast iron tread or platform shall
be less than three-eighths (x)
Inches thick nor steel treads or
PLATFORM less than one-auarter
The following construction may
also be used, viz: one and three
quarter Ux) inch oak or other
hard wood treads supported by
angle or ST. irons running paral-
and nrmiy secured TO channel iron
strings. The risers shall be form
ed OF rolled steel. not less
than three thirty-seconds asa
inches thick or cast iron plates not
inches thick and firmly fastened TO
the angle irons at top and bottom.
The clear space between the
angle or ST. irons" supporting the
wood treads. shah not be greater
Stairs constructed OF Reinforced
Concrete construction will be con-
sidercd as Fireproof.
Sec. II. 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,
Glass 2. Treads 10 inches. Risers 7h
Glass 8. Treads 9h inches. Risers
TX; Class 4, Treads 1oh inches, Ri
ers inches; Class s. Treads 10h
inches, Risers 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. Is. RUNS AND WIDTHS
any building Except residences.
stables and garages under three
stories in height) shall be less
than two CD feet six l0 inches
In I'M width. o The use Of Winding phI9s
All Public stairways with more
than eighteen (18) rtsers to
story. shall have platform or
intermediate level landing and
(a) risers between any two. (2l
landings or between any moor level
and q landing.
In all Public stairways there
shall be no change In the dimen-
between any two (2) floors. and
all stairways shall have at least
seven Cd feet perpendicular clear
headroom at all points.
The length or the platforms or
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 roy freada 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
metal. For stairs built OF Incom.
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-
ttT, On inches by one-auarter
DERs TO scUTTLEs. All build
ings having q scuttle In tile roof,
shall have a ladder or stairway
leading thereto from the floor be-
tionary or hung to the under side
Sec. IS. HALLS AND EN-
FRANCES. To all buildings other
than Private Residences. the
street of alley levels. shall not be
less than the width OF the inside
stairways leading thereto. and
where occupants OF the frst Moor
use the outside doorways at the
NJ az a afln
must be increased in width at the
rate OF twenty (20) inches for
every one hundred (100) persons
or fractional part thereof.
ings OF Glass 4 and 5 and Of Man
ufacturing buildings OF Class !,
shall open out, and shall not be
locked during business hours or
during occupancy. In such build
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
handle at 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
not be less than the Width Of
All Entrance Halls shall lead
directly from the street or alley
or from court connected with
l All Public Pu n,'y Han. shall be. thor
oughiy lighted by means Of win
dows In exterior walls.
Sec 10. CHANGING AND con-
STRUGGLING STAIRS. II shall be
to close up or to obstruct the stair
ways. Fire Escapes OF. 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-
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
ticie, and when made OF incom-
bustible materials. they shall be
carried on independent foundations
or upon the structural framing or
the building.
cred Fireproof must be built OF
brick or concrete not less than
eight (S) 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
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 (1%l
inches thick, tongued and grooved
and made tight.
ARTICLE XIII.
Fire Escapes.