NNSY BLDG 276 & 280
Project 8
Building 280, Install Exit Doors and Passageway
Architecture & Interior Design
Walls, Demolition: New egress doors will be provided in locations currently occupied by an
existing 4-sash metal window system. One module or sash of the existing window system will
be removed back to the nearest major framing member for provision of the new door and frame
assembly. Portions of the existing masonry exterior wall below the window section will be saw
cut and removed
New masonry to match existing will be toothed in at new door frames as required. Interior side
of wall at masonry patching will be sheathed and receive finish to match existing adjacent finish.
Masonry wall patching materials will match existing adjacent construction. Above the new
doors and adjacent to the existing window system, a new translucent wall panel system will be
provided for exterior wall infill. New masonry or steel lintels will be provided to rework the
head of the opening adjacent to the existing windows. Miscellaneous metal construction will be
provided to secure attachment of wall panel infill, door and frame assembly, and existing
window systems. At Bay 1, the existing service desk will be removed to provide access to new
egress door.
Walls: Interior passageway walls will be constructed of metal studs with gypsum board on each
side. New walls will extend to underside of existing concrete deck above. Walls will be fireresistance rated construction. Gypsum walls will receive a paint finish.
Floors: 12” x 12” VCT and associated 4” high resilient base will be provided in the new
passageway. VCT will be commercial grade with through-thickness pattern selected from
manufacturer’s full product line. At the exterior, the loading dock will be provided with a new
non-skid finish at the egress door locations.
Ceilings: Ceilings will be suspended acoustical ceilings 2’ x 2’ x 5/8”, fine fissured with tegular
reveal edge panels on new exposed grid. Ceilings will be at 8’-0” above finished floor.
Doors: Interior doors for passageway will be heavy duty, insulated, steel hollow metal door and
frame assemblies. For openings that occur in rated walls, the doors will be fire-resistance rated
and provided with label. Exterior door and frame assemblies will be flush solid core, extra heavy
duty, insulated, non-corroding galvanized steel hollow metal construction per ANSI/SDI A250.8,
Level 3. All hardware will be chrome-plated brass or bronze or stainless steel. Lock cores will
be BEST system. Hardware set for the out-swinging doors will be provided with panic hardware
devices. Masonry or steel jamb and lintel system will be provided to the new exterior wall
openings provided for the new doors. New door and frame assemblies will be provided in new
openings at Bays 2 and 4, 2 doors per bay. Existing door and frame assemblies will be removed
and replaced at Bays 1 and 3, 2 doors per bay.
Stairs and Railings: A removable metal railing system will be provided at each location of egress
door exiting to existing loading dock. The removable railing system will include metal sleeves
set into the existing concrete loading dock, such that the railings may be removed in the case that
they impede use of loading dock and bay doors.
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Project 8
New egress stairs will be provided at approximately midpoint of the existing north and south
loading docks. One new set of stairs will be located between Column Lines 8 7 and 9 8 at both
the north and south loading docks. The new pair of stairs will be pre-manufactured aluminum
metal stair including landing deck and railings. These stair systems will be protected by
removable steel bollards – 1 pair per stair.
Finishes: Doors and frames, both interior and exterior surfaces will receive alkyd gloss paint
finish in a color selected by the Government. Infill wall surfaces, interior and exterior, will be
finished to match existing adjacent finishes including applied textured finish system and paint.
Signage: Signage will match adjacent existing building signage and will meet ADA
requirements. Signage includes but is not limited to the room plaque and wayfinding per egress
requirements.
Firestopping Penetrations: Walls required to be fire-resistance rated construction will be
provided with head of wall, base of wall, and other transition detailing to support the required
rating. Likewise, all penetrations through rated construction will be provided with throughpenetration firestopping detailing in accordance with requirements for the rated construction.
Mechanical
This project requires a fire-rated exit passageway to be provided from the stairway in Bay 3 to
the exterior door located adjacent to the stairwell. The new corridor will be provided with
electric finned tube radiation to maintain freeze protection in this space. An estimate wattage
required for the finned tube radiation is 300W. Upon initial field visit, it was discovered that one
of the intake louvers for Bay 3’s ventilation system is located over the exterior door. This louver
will have to be removed and the wall infilled. On the other side of the stairwell is a second
intake louver for this space. That louver will be removed and the wall opening enlarged to
provide the additional outside air required with the removal of the louver over the door. Then, a
new aluminum storm-proof louver with a barometric damper. Ventilation rates for the H3
storage bay shall be per Government requirements.
In Bays 2 and 4 of this building, 4 new personnel doors (2 per bay; 1 at either end) will be
provided to allow for means of egress from each bay. The location of these new doors might
interfere with the existing intake louvers and steam finned tube radiation heat provided in these
spaces. If these doors are to be provided where finned tube heat currently is, the finned tube will
be cut and reworked to allow door installation without reducing the current amount of heat
provided in the space. If the doors interfere with the existing intake louvers, relocate the louvers
and dampers accordingly.
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Project 8
Electrical
Renovation: The existing explosion proof light fixtures, conduit and junction boxes shall be
moved to allow the installation of the passageway.
Lighting: The lighting fixtures indicated below shall be T5 lamps for fluorescent light fixtures.
The lighting shall consist of the following lighting per UFGS 26 51 00 Interior Lighting:
2’ by 4’ troffers or wraparounds.
Emergency lighting shall be provided with emergency inverters with battery backup.
Exit signs with a thermoplastic housing.
Within areas of Class I, Division I the lighting shall consist of the following lighting:
Strip fluorescent fixtures, Class I, Division I.
Emergency lighting shall be provided with emergency inverters with battery backup.
In cases where the emergency inverters with battery backup cannot be installed within
the fixtures, the emergency inverters with battery backup shall be installed outside of
the hazardous area with a circuit to the fixture.
Exit signs, Class I, Division I, shall be located over each door associated with the exit
access, path of egress and exit discharge door.
Exit signs, explosion proof, Class I, Division I. These signs shall be placed over all the replaced
exterior doors and frames. See the architectural narrative.
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