Current through Register Vol. 46, No. 12, March 20, 2024
(a) Fastenings.
(1) Anchor fastenings, except nuts,
reinforcing plates and washers which are protected from the weather, shall be
of the same metal as the anchor.
(2) Every fastening bolt or machine screw
shall be machined from bar stock or hot forged. It shall have at least
three-sixteenths inch of unthreaded length under the head and threads shall be
cut.
(3) Every reinforcing plate
shall be of steel and shall be cleaned and painted with at least one coat of
corrosion resistant paint before installation.
(4) Nuts and machine screws shall be screwed
tight without producing excessive stress.
(5) To prevent turning, loosening or backing
off, threads shall be peened close to the nut or plate or in lieu thereof,
heavy lockwashers, firm locknuts or other positive means of retaining the
finished position of threaded parts may be provided.
(b) Installation in pairs.
(1) Anchors shall be installed so as to be
usable in pairs from a position on the sill from which the cleaning is done and
with each terminal of the safety belt attached to a separate anchor.
(2) One anchor shall be installed at each
side of a window which may be, and is to be cleaned by the authorized method of
working from the sill or ledge, so that each window has its own pair of
anchors, except: where three double-hung windows with two separating mullions
are set in one wall opening and the outer sash openings are less than 21 inches
in width, anchors need not be installed at the outer sides of the outer
windows.
(c) Height
above sill. Anchors shall be between 42 and 51 inches above the sill or
ledge.
(d) Terminal space. Each
anchor shall be located so as to permit easy attachment and removal of a
terminal and free play of the terminal when attached.
(e) Accessibility from inside. Anchors shall
be located so as to permit easy attachment of a terminal to either anchor
without extending more than one arm beyond the sash opening.
(f) Wooden frames.
(1) Anchors shall be attached to wood or
metal covered wood window frames or mullions by bolts not less than
three-eighths inch in diameter which pass through the entire window frame or
mullion by holes not more than seven-sixteenths inch in diameter drilled
through a solid section, such as a pulley stile or equivalent, of the frame or
mullion.
(2) Bolts shall be
securely fastened by a nut and washer.
(3) The outside diameter of such washer shall
be at least twice the diameter of the bolt hole.
(4) Notwithstanding any other provision of
this Part, the ends of such bolts shall be peened to prevent loosening or
removal of the nuts.
(5) The back
face of anchors for installation in wood windows, frames or mullions shall be
provided with at least two sharp lugs or equivalent means to prevent turning of
anchor after installation.
(6) Such
installations shall be made only where frames are securely attached to the
building.
(g)
Installation of masonry type anchors.
(1)
Hereafter masonry type anchors shall not be installed in existing masonry or
concrete walls, nor in any poured concrete. Such anchors shall be installed
only in new walls of masonry unit construction.
(2) No such anchor shall be installed unless
it is shaped to build into the joints between the masonry units being
used.
(3) Each such anchor shall be
firmly imbedded in the masonry and so placed that its flange bears flush
against the masonry unit.
(h) Installation on hollow metal window
frames.
(1) Frame requirements. Anchors shall
not be installed on hollow metal window frames more than 10 feet in height
unless such frames are approved. All other such frames shall meet the following
specifications.
(i) Hollow metal window
frames shall be of steel, aluminum or bronze. If made of any type of steel, the
minimum thickness of the metal shall be 0.025 inch and its minimum ultimate
tensile strength shall be 60,000 psi.
(ii) If made of aluminum, they shall be made
of extruded aluminum alloy, type 6063 T5, or equivalent, and the minimum
thickness of the metal shall be 0.062 inch.
(iii) If made of bronze, they shall be made
of extruded architectural bronze, type Copper Alloy No. 385 as designated by
the Copper and Brass Research Association, or its equivalent, and the minimum
thickness of the metal shall be 0.078 inch.
(2) Attachment of anchors to hollow metal
frames.
(i) At least two bolts or machine
screws not less than three-eighths inch in diameter and of proper length shall
pass through the frame and through the middle of a steel reinforcing plate
placed on the inside of the frame.
(ii) Provision shall also be made by means of
adequate stiffeners to transmit the force of any load placed on the window
anchors to the full cross section or depth of the jamb or mullion.
(iii) Bolts shall be secured by means of nuts
and lock washers.
(iv) If bolts are
not used, the reinforcing plate shall be tapped to receive the machine screws,
which shall be screwed through the plate with at least one complete thread
protruding.
(v) In installations
made after February 25, 1964, a lock washer shall be provided under the head of
the machine screw.
(vi) Reinforcing
plates shall be at least five-sixteenths inch thick and three-quarters inch
wide.
(vii) When used with steel
window frames reinforcing plates shall be at least 12 inches long if the frame
metal thickness is less than 0.062 inch and at least six inches long if the
frame metal thickness is 0.062 inch or more.
(viii) Aluminum and bronze window frames
shall have reinforcing plates at least 12 inches long.
(3) Existing installations on hollow metal
frames. Installations of approved anchors made before February 25, 1964, on
frames of ferrous metal shall be in accordance with the provisions of former
Industrial Code Rule No. 21 which were in effect at the time of installation.
Such installations on sound and substantial frames of aluminum at least 0.062
inch thick or bronze at least 0.078 inch thick, if made in accordance with the
provisions of former Industrial Code Rule No. 21 relating to installations on
frames of ferrous metal which were in effect at the time of installation, are
hereby authorized.
(i)
Installation on solid metal window frames.
(1)
Anchors shall be attached to solid metal frames by at least two bolts or
machine screws not less than three-eighths inch in diameter which shall be of
proper length and shall pass through the frame.
(2) Bolts shall be secured on the inside by
nuts and lock washers.
(3) If bolts
are not used, the frame shall be tapped its entire thickness and the machine
screws shall be screwed through the frame with at least one complete thread
protruding.
(4) In such instances
the thickness of the frame shall afford at least five-sixteenths inch length of
threaded hole or a tapped reinforcing plate shall be used as for hollow metal
frames, and in installations made after February 25, 1964, a lock washer shall
be provided under the head of the machine screw.
(j) Attachment of frames to wall
construction. Window frames shall be so designed, constructed and installed as
to be securely fastened to the wall construction.
(k) Firm installation required. Every
installation and its supporting structural features shall be firm and stable.
Anchors and anchor fastenings shall be secured to prevent them from turning,
backing off or becoming loose.
(l)
Evidence of compliance. In respect to the requirements of this Part regarding
the metal used in or in connection with metal frame windows, whether hollow or
solid, their internal construction, their installation in or attachment to a
building structure and the attachment of anchors to them, the manufacturer,
builder or installer, as the case may be, shall prepare a written and signed
statement setting forth in detail the facts establishing that such frames and
their installation are in accordance with the requirements of this Part and
shall cause such statement to be filed with the commissioner. Upon the filing
of such a certificate the commissioner may, if he finds it sufficient, accept
it as presumptive evidence of the facts therein stated.