The Lubbock avalanche. (Lubbock, Tex.) 1909-1922, 1922-05-16

shall be laid IN Portland cement
mortar. The comprcssive strength
OF building blocks shall be calculated
upon the gross area Of the bedding
surfaces; the average ultimate com
pressive strength for terra Gotta
blocks laid with cells vertical shall
not be less than 1900 pounds per
square inch; the average for con
crete blocks with cells vertical shall
not be less than 800 pounds per
square inch; concrete blocks shall
not be more than SO days old at the
time of the test, and the average
strength shall be based on ten blocks
of average quality. The allowable
working stress Of hollow building
blocks shall not exceed 100 pounds
per square inch of gross area for
terra Gotta, or rs pounds per square
inch for concrete in gross area; II
the cells be laid horizontal, the al
lowable working stress shall not ex-
coed 80 pounds per square inch Of
gross area.
All walls and partitions in schools,
hospitals and places Of public assem-
blage over one story high, and all
walls and partitions in theaters shall
be built Of brick, Stone, hollow or
solid blocks. or metal lath and Port
land cement plaster or metal stud
ding, or equivalent as to incombusti-
bility.
Section 10. Concrete Construction
Concrete for reinforced construction
shall consist of wet mixture Of one
part Portland cement TO not more
than 6 parts of aggregate, fine and
coarse, in such proportion TO pro-
duce the greatest density. The quality
of the material, design and construc-
ton shall be in accordance with best
engineering practice.
Section H. Protection of ends Of
wooden beams: The ends Of all
floor, ceiling or roof beams, enter
ing a party or fire wall from opposite
sides shall be separated by at least
S inches Of solid masonry; such sep
aration may be obtained by corbeling
the walls or staggering the beams
or the beams may be supported by
steel wall hangers; no wall shall be
corbelod more than two inches for
this purpose; the ends Of all wooden
beams entering walls shall be so cut
TO make them self releasing.
Section H. Protection Of wall
openings: No opening in an interior
masonry wall shall exceed s feet by
10 feet; il the opening be in a party
wall or "A fire wall II shall have an
approved automatic fire door on each
side Of the wall; II an opening in n
fire wall is made to serve as an
emergency exit, il shall not exceed
As square feet in area, and an APP
proved self-closing fire door shall be
substituted for one Of the automatic
fire doors; the total openings in a
fire wall shall not exceed 25 per
centum in linear feet Of the length
Of the wall
Every building within the fire linn
It's except churches, dwellings, ten
ement houses, dormitories and lodg
ing houses shall have approved fire
doors shutters or wired glass in in
combustible frames and sash on ev-
cry exterior opening above the first
story, except when fronting a street
not less than 80 feet wide. or where
there is no other building within 30
feet: al openings in the side and
rear walls Of the first story, except
show windows, shall be protected in
like manner; all exterior windows
more than 70 feet above the curb
shall have incombustible frames and
snshes and glazed with wired glass;
occupants of buildings shall close all
interior and exterior fire doors,
shutters and windows at the close Of
each business day.
Section -. Stairway and Ele-
vator Shafts In all buildings, here
after erected, except private dwell
ings, which are used above the first
floor for business purposes or for
public assemblage, or for any pur-
pose whatever II over three stories
high, the stair shaft shall be separa-
tely and continuously enclosed by in
combustible partitions. Elevator
shafts in all buildings hereafter
erected shall be enclosed in the same
manner. The partitions shall be con-
structed Of brick or other fire-resist-
i've material approved by the Build
ing Inspector. and all mortar used
in the construction shall be cement
mortar. No such hollow partitions
shall be less than inches thick. no
brick partitions less than inches
thick. and no other solid partition
less than 4 inches thick
Except az herein stated, the stair.
elevator, or hoist-way shafts In all
existing buildings over two stories
high, Of the class described boz this
section, shall be separately enclosed
by uncomfortable partitions a. above
specified; or the shafts may be- en-
closed by approved hollow or solid
partition blocks no tless than Q inch-
Is thick, set in Portland cement NOR
tar; or by 4-inch stud partitions, COW
cred on each side with not less than
3-4 inch Of Portland cement plaster
on metal lath: or by pinch solid met
al lath and Portland cement plaster
partitions. The metal frame work
Of such partitions shall be securely
fastened 10 both floor and ceiling.
All lath used for such partitions
shall be of galvanized steel weighing
not less than 81 ounces per square
yard. Wire lath shall be not less
than No. 20 gauge, and sheet metal
lath not less than No "a gauge All