and Guidelines for Rehabilitating Historic Buildings" as a guide
for projects affecting windows of historic buildings. Copies of
this booklet are available from the Historic Preservation Office
(187).
10.2
ENERGY CONSERVATION:
a.
Design windows in accordance with energy requirements in HVAC
Design Manual."
b.
For double-glazed windows, provide a continuous thermal break
between inner and outer sash; also between inner and outer
frame components including window sill.
10.3
SILL HEIGHT: Window sills/stools shall be a minimum of 450 mm (18
inches) above the finished floor.
10.4
OPERABLE WINDOWS:
a.
Operable windows are more costly than fixed windows and more
subject to drafts, leaks, and maintenance problems, but may be
required or justifiable for:
-
washing and glazing from within the building
-
ventilation in non-air-conditioned buildings
-
emergency ventilation in case of loss of electrical power
to HVAC system (when HVAC system is not on emergency power
system)
Make design decisions on operability in close consultation
with facility management, specifically addressing all the
factors above. Operable windows shall be in-swinging and
side-hinged unless historic design compatibility or other
specific conditions dictate otherwise. All operable windows
in air-conditioned buildings shall normally be closed and
locked.
b.
When in open position for ventilation, window sash shall not
project into the room beyond edge of stool or face of
convector, nor beyond exterior reveals of window sills within
2000 mm (6'-6") of grade.
c.
Mechanically operated windows shall be avoided. If they are
necessary for high, clerestory, monitor or other inaccessible
windows, then the mechanical operators shall be simple and
durable.
11.
SCREENS:
11.1
WINDOW SCREENS: Provide insect screens only on operable windows
in spaces which are not air conditioned.
11.2
VENTILATION SYSTEM SCREENS: Provide bird screens on mechanical
ventilation supply and exhaust openings in exterior walls.
Provide insect screens on the inside of louvered openings in
exterior walls where there are no duct connections.
SHADES, BLINDS, DRAPERIES, OR CURTAINS: The construction of window
12.
heads shall include a fireproof back plate or board designed to
accommodate the attachment of window coverings that may be installed by
the users after completion of the building construction.
13.
PARTITIONS:
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