The Detroit times., 1910-12-07

stories In ight. shall have at least
two CD stairway. each 20 be not
5 II the number OF persons al any
time occupying or using any or all
o or the floors above the nrst. shall
J exceed three hundred (So0) then
4, the width OF each OF the stAirways.
I t6l feet. Should the number OF
. persons exceed eight hundred $500
y three CD stairways each fvs 90
foet wide wili- bo required.
5 For Fireproof Buildings or
buildings where the stairs are on
o closed In Fireproof Shafts. two t2D
! stairways only will be required.
2 each 10 be at least four ca feet
8 wide II
4 The stairs in -Fireproof
9 height. must either be made OF
Fireproof or Incombustible Ma
s terials. or be enclosed In Fire
Sec. G. NUMBER AND WIDTH
: OF sTAIRwAYs IN CLASS
: Sections IA. IL. is Of this ordin-
Sec. :. NUMBER AND WIDTH
2 OF STAIRWAYS IN school.
3 BUILDINGS. school Buildings OF
: either Public or Private ownership.
I. rooms above the nrst az story.
shall have at least two Cn sep
"rS,s shah be Iss. shan
four ca feet wide In the clear.
Should the number OF persons
occupying the rooms above the
/: a mrs, t tn story exceed three hun ,,,
= be required.
Z In school Buildings having two
(2) stairways. the width Of each
must not be less than twenty GOO
has IN hstv. 10
l persons occupying rooms above the
. first story
3 In School Buildings having three
I CD or more stairways. the width
. teen u5) inches for every one hun
. dred u00) persons occupying
rooms above the first story.
I. The walls enclosing stairways
% ana stair halls must be built or
j lncombustible Material and have
: Fire Doors at each floor level and
= these walls must be carried on
! independents foundations.
5 stairs In School Buildings over
Z constructed OF Firsproof or In
s combustible Materials.
Sec. s. DECREASE IN WIDTHS
OF UPPER STAIRWAYS. At the
discretion Of the Department OF
ways IN different Glasses or Build
y ines, may he decreased from the
requirements herein called for as
such stairways approach the upper
= stories and according TO the occu-
o pancy OF these upper stories. pro-
vided that the number Of stairways
he maintained to the top story.
: the aggregate widths conform TO
. and no single stairway be less I'm
D Width than the minimum require
! ments or each class.
Sec 9 BASEMENT STAIR
WAYS. Every Basement shall
have at least one % stairway
Leading directly TO the street. al
lev, or 10 the floor above.
6 Whenever any Basement 10 used
FOR living rooms. manufacturing
purposes. salssrooms or places OF
. stairway. leading directly TO The
street or TO all open court with
direct access 10 the street
3 All such stairways shall be not
inches In width. and shall be In
creased IN width according TO the
number OF persons occupying such
Basement. and as required by the
Department or Buildings.
20 Every Building I'm which Boilers
I or Machinery requiring attention
- are placed In the Basement. shalt
= have at least one % stationary
. leading directly TO an ample open
g ing In, the sidewalk or to other
Sec 10. sTArRwAYs AROUND
hereafter be constructed around or
4 alongside of an Elevator Shaft.
in any building over three iS,
stories In height. unless surh
Elevator by Fireproof Wall
Provided that I'm F1reproof Build
o ing the stairway may be adjacent
10 an Elevator. II the stairway and
3 sonry Fireproof Wall with Fra
Doors
Sec IL. LOCATION OF STAIR
WAYS All stairways where prac-
tical. shall be continuous from the
topmost floor down 10 the ground
floor aud when two CD or more
stairways are required. they shah
be located at as great a distance
from each other as Is practical.
Where not continuous. the DIFF
ferent stairways must be con
nected by ample corridors
> No stairway leading to the
4 located under any stairway ex-
tending above the second CD moor
unless such stairway be enclosed
= In the Easement by Fire walls
@ Stairs in private residences and
% In stables and garages less than
y three 90 stories In height Will
2 not be required TO be enclosed In
Sec IL. MEASURE OF STAIR
! WAYS. The width Of stairs shall be
2 the clear distance between the two
(2) hand rails. or the clear DIS
5 rail. The width OF the "run" OF
treads. shall be the horizontal dis
lance from face OF riser 70 face or
riser. The height Of the risers
shall be the vertical distance from
o the top OF the tread TO the top OF
/ tread
Sec Is. CONSTRUCTION OF
STAIRS The construction OF all
ments OF the Glass OF Building In
which they are placed. Where an
incombustible stairway Is called
for and In which treads ana land
8 i inss Of iron Iron stairs air., are to be Sf
! directly underneath for their en-
e tire length and width by steel or
3 iron plates 50, made sk.. :Slid o, ,o having
l5 square inches. TO be Of adequate
e strength and fastened TO the
Y strings.
g less than one--eishth (Hl inoh in
20 thickness II of rolled steel or one
y quarter (H) inch II OF cast iron
2 In case such supporting plates are
70 made solid. the treads shall be Of
Is than one and three quarters (lK)
20 inches thick. Where cast iron or
y rolled steel are used for tread.
y they shall have upper surfaces cor-
- rugated or ribbed, or they shall be
10 provided with safety trsads. No
II cast iron tread or platform shall
70 be less than three eighths (x)
"a inches thick nor steel trsads or
Is platform less than ons-QuArtDf
- (L) inch thick
10 The following construction may
II also be used. viz: one and three
IS quarter GH) inch oak or other
20 hard wood treads supported n
10 angle or "T"' irons running parNi-