The Detroit times., 1911-02-20

,b) Hollow Burnt Clay. or
Terra Gotta or Cement fioor BLOCKS.
not lcss than eight tS) inches deep.
having proper skcwbacks and keys.
also shoes Co NJ the metal beams.
Hollow Blocks shall have Webs and
ribs not less than hve-eighths (hl
inches thick. Such Floor Blocks
shall be laid In Cement mortar.
(c) Reinforced Concrete made
as hereinafter described In Article
Cd) Other ,incombustible ma
terials which have been accepted
and approved for floor construction
hy the National Board OF Fire Cn-
derwriters and by the Department. OF
Sec ia. FIrL UNDER FLOORS
Where wood\ floors are used over
Isireproof Floor Construction the
entire space between the top OF the
floor construction and the underside
of the finished floor shall be filled
with Concrete For this purpose
Cindcr Concrete made OF one CD
part Portland Cement and not more
than eight (S parts OF we'll burnt
einders may he used.
Sec. rs. CEILINGS. Ceilings In
hreproof construction. shall be en-
tireiy OF flrcproof materials and
when used for ceilings only. they
NAV be of light construction, but
must be so constructed that they
bear no weight OF floors or roofs.
Sec. IS TYPE 2. PROTECTED
CONSTRUCTION; This type OIL con-
buildings (which all enclosing
walls and the roof covering are 10
be made OF incombustible material.
and all interior bearing walls OF
brick or concrete or having columns;
beams and girders made or metal
protected with fireproof material. as
herein described for fireproof con-
struction.
All stairs and elevator enclosures
shall be made entirely or incom-
bustible material.
The floor beams or joists. floors,
roofs and ceilings may be made or
wood protected with hreproof ma
terial.
Floor beams shall be covered on
top with at least one and three.
quarters I&) inches OF solid wood
sub-fioor, having on IL one layer or
one and one-half Nk) pounds per ;
yard asbestos paper ana seven
Fights ca inch finished wood floor.
IL the sub floor be less than ,hree
and one-half (S2) inches thick. II
shall be splned or tongued and
grooved.
ON floor jolsts. one a. thickness
OF sevcn-e Fights CD inch flooring
with two CD inches OF mortar may
three-quarters G%) inches or
solid floor and asbestos paper.
Floors ceilings and roofs. con-
structed OF wooden beams ana Joists.
shall be covered on the underside
with at least one Cd inch or nre-
proof material and at least one I'D
coat OF plaster.
Metal lath and plaster shall not
he deemed sufficient for the one
Cd inch OF fiTeproofing.
hna "a rs N mi
construction, and the underside OF
the flooring on the beams serves as
the ceiling, this one I'd inch OF nre-
proofing and plaster must be applied
10 the sides and bottom OF the beams
and to the underside OF the floor.
On the top OF ceilings. one % inch
OF mortar or similar and approved
material will be deemed sufficient
fire protection. provided all exposed
upper parts OF such ceilings. with
beams. etc, are so protected.
No wood shall be used for any
carrying partition or post.
Non-carrying partitions may have
wood studs, but all wood studs must
he covered with metal lath and ce-
ment plaster. also the soffit or stairs.
Wood Turing for walls or wood
lath will not be allowed.
Sec. II. TYPE 8. MILL con-
STRUCTIQN. This type OF con-
struction shall be applied to all
buildings in which enclosing walls
and the roof coverings are TO be
made OF incombustible material and
all interior walls OF brick or con-
crete and. having columns and GRID
ers. Floors. ceilings and roofs shall
be constructed with either metal or
wood girders and beams.
Beams and Orders shall be COW
cred on top with at least one and
three-quarters Q%l inches OF solid
wood sub-fioor having on II at least
one % layer OF one and one-half
COR ~ two s 1s9 Inches pe Of mortarS and
seven-eights Cd inch finished wood
floor II the sub-fioor be less
than three and one-half t3iz) inches
thick. IL shall be splined. OF tongued
and grooved.
The columns, IL OF wood, shall
have a sectional area OF not less
than sixty 600 square inches
The Orders and beams IL OF wood.
shall have sectional area OF not
less than fifty-six (56) square inches.
Columns. Orders and beams, IL or
metal, shall be covered as In Pro
tected Construction"
Stair and Elevator enclosures shall
he made entirely OF incombustible
material. at least four CD inches
thick.
IL such buildings are four CD or
more stories in height. the stair and
elevator enclosures shall have self
closing, standard fire doors, and the
windows I'm Interior walls shall have
metal frames and wire glass.
Wood Turing for walls shall not
be allowed.
Wood posts shall have metal caps
forming a base for the post above
and the ends OF Orders shall be Sc
cured to the cap in such manner
as 10 be self-releasing.
Wood beams and girders having
a cross section less than eighty
800 square inches, shall be In solid
pieces and where two Cd or more
pieces are used TO form a beam, they
shall be bolted together at intervals
OF not over thirty-six $3.50 inches and
with bolts not less than one-half
ga inch in diameter.
The ends OF all wood beams and
Orders resting In walls shall be cut
beams and Orders shall not extend
seN is. TYPE Z. ORDINARY
strgstion shall h be applied t. all
walls are to be OF incombustible ma
terial. but In which the interior
timber and iron structural parts are
not protected with fire resisting COW
ering.
Sec. 10. TYPE s. FRAME CON-
struction;; This type OF eonstruc-
In which enclosing and interior walls,
floors. ETC.. are to be constructed
entirely OF wood.
Wood frames covered with brick,
stone or cement veneer. shall be
ciassed I'm this type.
Sec. 20. TYPE 8. SKELETON
CONSTRUCTION. BY this term
shall be meant all buildings I'm
which all internal loads and
strains, or both internal and
external loads and strains are
transmitted to the founda-
tons by skeleton or
framework OF iron or steel
or reinforced concrete. Such build
ing may be freproof or pro-
tected construction. OF may have
mill construction floors and all
skeleton construction buildings must