The San Francisco call., 1909-11-27


OF height shall be 55 feet If wooden
lath be used or II not lathed: but in no
case shall more than four stories be
included in this height.
Glass c buildings may be built 10 the
ma NlmIm height without lathing II the
interior * OF mill construction Class
G buildings may be built anywhere in
the city
CONCRETE CoNsTRUcTI0N
There sre special provisions concern
ing reinforced concrete construction.
The following is Of general interest:
Reinforced concrete walls shall be a
least six inches thick If the area OF
wall surface included between any two
adjacent wall columns and adjacent
floor girders exceeds 900 square feet
and is less than 400 square feet. the
thickness OF the wall shall not be less
than eight inches II the area exceeds
400 square feet. the wall thickness shall
not be less than IL inches, supported on
the frame at each story
In reinforced concrete walls the area
of steel reinforcement shall a aggregate
one-half of per cent q the area OF the
concrete and may be placed vertically
or horizOntally. or part vertically and
part horizontally
more than p inches apart. Additional
reinforcement shall be placed around
openings, and ali reinforcement shall
be wired al each intersection All rein
forcement shall be rigidly connected at
columns and giTders 10 tie steel frame
Reinforced concrete walls may be
built IN the form Of bearing walls Of
required FOR brick walls.
II walls are built OF piers and con-
Meeting walls the piers shall be calcu-
lated and constructed : columns The
connecting wall II built OF reinforced
concrete without windows. may be con-
sidered as self-supporting. in which
case the thickness shall be six inches IN {
the upper 40 feet followed by in
crease OF three inches in thickness for
every additional 30 feet height
Where such walls are pierced by
openings for doors and windows the
entire loads shall be concentrated on
the piers, which shall be proportioned
as columns
wooden building is classed as one
having exterior walls or a portion
thereof constructed Of wood. Wooden
frames or frame or wooden buildings
covered with metal, plaster. tiles or
terra Gotta. or veneered with masonry.
shall be deemed to be frame or wooden
structures. No frame or wooden build
ing now existing within the fire limits
can be enlarged or built upon, nor can
any frame or wooden building now ex-
listing within the fire limits be repaired
without a permit from the board OF
public works The walls OF frame or
wooden buildings must be constructed
with studding- covered with weathered
boarding on the outside and no uncoy-
cred studding can be placed against the
wall OF an adjacent building or struc-
ture- Provision is made for frame
factories that are more than two
Stories high as follows.
All frame or wooden buildings more
than two stories high hereafter erected
or enlarged 10 be used as factories.
shall De constructed as follows. The
weight Of all the floors shall be con-
centrated at certain points. and no
support shall rest directly upon stud
wall. but ali beams, girders and girdeFs
supporting floors. snail rest directly
siTnTor.fnp doors shall not he more
than nine feet apart. upon these shall
rest the floor, which shall extend from
shall not be less than Of three inches
thick plank PiaHks shall be laid 10
the ends OF the timbers- The filing
between posts and walls shall be built
Of not less than 2x4 inch studs, Is
inches from cenfers.
Much interest is found in the rule
concerning theaters- Every theater
herea fter erected TO be used FOR the
stricsl or operate purposes must be
constructed in accordance with the
requirements Of the ordinance relating
10 class for steel frame construction:
No building which al the time of the
pa ssage of this ordinance is not in act
ual uSe for theatrical or Operatfc pur-
poses and no building hereafter erected
not N conformity with the require
ments of this ordinance shall be used
TnHETFtC6I ODfTaTlC purposes
until the same shall have been made
10 conform to the requirements Of this
ordinance And no building herein de-
scribed shall be opened to the public
for operate or theatrical purposes until
the board OF public works shall have
approved the same in writing as con-
forming TO the requirements of this
ordinance. and the tax collector shall
refuse TO issue any license for any
performance in any such building until
a certificate in writing of such approval
shall have been given by said board of
public works
a diagram or pian OF each tneater
gallery or floor showing distinctly the
exits therefrona, each occupying a
space not less than Is square inches.
shall be printed IN black lines in a
legible manner on the program Of the
performance
sAFEGU ARDS FOR FIRE
As a matter of IRE protection IT is
provided that all existing buildings
and those hereafter erected exceeding
100 feet in height shall be provided
with such auxiliary fire apparatus and
appliances as wrenches. spanners. fire
extinguishers, hooks, axes and pals
IRE department; all OF said apparatus
70 conform in design to those in use
by the fire department
The ordinance adopted by the SUPER
visors calling for the removal of all
the buildings erected in San Francisco
since April is. 1906. in violation of the
building law and ordinances of the city
and county is made a part OF the law
and the date for removing all such
structures is May 1. 1910. The provts-
ions OF that ordinance may profitably
be repeated here because there seems
10 be some misunderstanding in va
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