Part l - General
1.01 Description of Work
A. Work in this section includes, but is not limited to: access
floor panels, understructure, Krantz air diffusers, grounding,
various electrical, data, communication and accessories, plenum
dividers and temporary cover plates.
B. Related work specified elsewhere:
1. Concrete: Division 3
a. Cast-in-place concrete shall be within 1" of
specified height and shall not vary more than 1/4" in 10.b.
Concrete sealer shall be as recommended by the access floor
manufacturer or an approved equal that is compatible with
floor pedestal adhesive.
c. Depressed slab, if specified, shall be compatible with access
2. Finishes: Division 9, reference paragraph
a. Carpet: Section 09680. Carpet Tile, shall be
PosiTile as manufactured by Tate Access Floors
3. Mechanical: Division 15.
Assure compatibility of floor air diffusers installation
with access floor.
4. Electrical Division 16. Electrical
contractor shall connect access floor to building ground
as specified in paragraph 3.03 C.
5. Insulation Division: Coordinate
insulation with access floor contractor for areas of air
1.02 System Description
A. Access floor system shall consist of nominal 24" square,
modular panels supported by and secured to adjustable pedestals.
Panels shall be secured to pedestals with one captive fastener
at each corner.
B. All components of the access floor system are to be of
steel construction except for the lightweight cementitious
fill and modular carpet tiles.
C. Panels shall be easily removable by one person with a
lifting device and shall be interchangeable except where cut
for special conditions.
D. Complete floor system shall be sturdy,
rigid, and free of overall rocking, rattles, squeaks and noises.
The finished floor shall be level within +/- 0.100 and shall
be level within +/- 0.062" in any 10' direction.
E. Quantities, finished floor height (FFH)
and location of accessories shall be as specified on the contract
F. System shall be electrically conductive
for dissipation of static while having enough electrical resistance
to provide protection against electrical shock.
G. Controlled air plenum system shall be an
integral part of the access flooring system and be capable
of providing a controlled and uniform flow of supply air at
the temperature and air volume as indicated on the mechanical
1.03 Quality Assurance
A. Manufacturer shall have a history of five years
of successful projects of similar size and complexity.
All structural access floor components shall be supplied by
one manufacturer to ensure compatibility. Products shall
be manufactured and labeled "Made in USA".
B. Contractor shall be approved by the manufacturer, use
manufacturer approved service personnel and shall have a history
of five years of successful projects of similar size
C. Panels shall have a flame spread rating of 5 or less when
tested in accordance with ASTM E-84.
D. Method for testing resistance of the access floor system
shall be in accordance with NFPA No. 99, Chapter 3, modified
when maintaining the room at 45% +/- relative humidity. System
shall be electrically conductive for dissipation of static
while having enough electrical resistance to provide protection
against electrical shock.
E. Access floor shall be capable of resisting
the horizontal force (Fp) in accordance
with the current Uniform Building Code Standards
for an office building in seismic zone
A. A pre-job conference to establish schedule, review
shop drawings and coordinate trades must be attended by the
general contractor, electrical contractor and all others whose
work may be affected by the access floor system.
B. Pedestal locations shall be established from approved
shop drawings so that mechanical and electrical work can be
installed without interfering with pedestal installation.
C. Installation of access floor and under
floor supply air diffuser shall be coordinated
with other trades to maintain the integrity of the
A. Manufacturer qualifications.
B. Contractor qualifications.
C. Certification that
material and installation are in accordance with the specification.
D. Test reports by an
independent laboratory certifying that component parts perform
E. One each of the following
are to be submitted for review as specified: floor panel, pedestal,
KB-200 air diffuser and captive fastener.
F. Shop drawings of panel layout shall include
railings, steps, and ramp locations with details
of assembly components, anchoring methods,
perimeter conditions, service boxes, air
diffusers, cutouts, grounding methods and
interfaces with other
1.06 Delivery and Placement
A. Materials shall be
delivered in original, unopened packages clearly labeled with
the manufacturer's name and item description.
B. Material packages shall be
distributed around the areas where they will be
used to avoid over stressing the sub- floor and to
1.07 Project Conditions
A. General contractor shall provide secure storage
and a clean sub-floor which is free of dust, construction
debris and other trades during the installation of access
B. Building shall be enclosed and the temperature
shall be maintained between 40 degrees and 90 degrees
Part 2 - Products
A. The access floor and under floor air system
shall consist of 24" square Concore 1250 PosiLoc
panels, PosiLoc understructure, CII Modular Wiring for Power,
Data and Telephone and Krantz high induction air diffusers.
This system is designed for general office applications,
manufactured by Tate Access Floors and distributed by Pugliese
Interior Systems, Inc. 1 Bendix, Irvine, CA. 92618 (949)
B. Other manufacturers and products requesting
approval must meet or exceed all structural and design
criteria and have written prior approval from the architect
10 days prior to bid.
A. Floor panels:
1. Panels (Type I) shall be bare
Concore 1250 PosiLocThe panel perimeter shall be
manufactured to receive the pedestal head
2. Exposed concrete finish is unacceptable.
3. Chipboard or particleboard core is unacceptable.
4. Panel assembly shall include four fasteners held
captive to the panel.
B. Floor covering:
Panels shall be supplied bare with PosiTiles to be furnished
and field installed under this section.
Pedestal assemblies shall be electro-galvanized steel.
The base shall be a minimum of 4" x 4" x 1/8" square and
shall be stamped and/or embossed on its underside and shall
be adhered to the sub-floor with an adhesive recommended
by the access flooring manufacturer. The threaded
stud will be 3/4" diameter solid steel. The head assembly
shall be designed so that the panels will be laterally locked
in place. The entire assembly shall provide a minimum
of 2" of vertical adjustment, when FFH is 6" or more.
The assembly shall provide a mechanical means to lock the
floor in a level plane and adjustments shall be capable
of being made without special tools. The head shall
be designed to accept a metal fastener to mechanically lock
the panels in place. Pedestal assembly shall support
a 8,000 lb. axial load and shall resist a minimum
1,000 inch-pound turnover moment when bonded to a clean
D. Air Control Plenum Diffusers
Air Control Plenum Diffusers Floor diffusers, shall be
KB-200, high induction type manufactured by H. Krantz
& Co. The KB-200 diffuser is injection molded
with high impact polycarbonate equal to Makrolon #94-15,
and shall be capable of supporting a 1400 lb. concentrated
load. The polycarbonate shall be self extinguishing
type which complies with UL-94 and ASTM-D635-74 criteria.
The diffuser shall have angular slots that twist
air exiting the diffuser with a minimum induction ratio
of 10 to 1. Optional damper shall be installed
within the diffuser as specified. The KB-200 diffuser
shall deliver a minimum air flow of 75 cfm depending upon
the static pressure indicated in the mechanical section
of the specification. A complete unit consists of
the twist element, dirt collecting basket, damper and carpet
tension ring. The product has no moving parts nor
requires any power to be operable. Refer to Division
1. CII Modular Wireing System
shall be as detailed on the drawings for both
power , data and telephone.
2. PVD Service Boxes: shall be provided
at location detailed on contract drawings. Outlets
shall have a UL listing, and be capable of accommodating
power, signal and communication cables. Panels to
have factory cutouts.
3. Provide standard expansion joints,
plenum divider, and access holes with grommets where
indicated on the contract drawings.
4. Provide manufacturer's standard lifting devices
of the type compatible with the panel covering.
5. Plenum dividers shall be
constructed from either 18 gauge galvanized
steel sheet or .064 inch aluminum
plate. Provide sizes and thickness to meet
6. Provide temporary 14 gauge metal
covers over factory cutouts for electrical boxes
and air diffusers prior to their installation.
F. Maintenance materials: Provide the following
spare materials ____panels, _____pedestals, ____service outlets,
_____KB-200, ____lifting devices.
A. Structural performance of the panel system shall
perform as indicated below:
||800 lb. 10,000 cycles/
1,000 lb 10 cycles
Panels shall withstand a rolling load of 1,000 lbs. applied
through a 3" dia. x 1-13/16" wide caster for 10 cycles
over the same path with less than .010" top surface permanent
set. Panels shall withstand a rolling load of
800 lbs. applied through a hard rubber-surfaced wheel 6" dia.
x 1-1/2" wide for 10,000 cycles over
the same path. Permanent set at the conclusion of the
test shall not exceed .010".
B. Heat Transmission: Bottom surface
temperature exposure to 1600 degrees F for 15 minutes shall
not increase the top surface temperature
more than 150 degrees above the ambient temperature.
C. Air Supply Diffuser: The underfloor air
distribution control plenum system shall use the Krantz KB-200
diffuser where shown on the drawings.
Part 3 - EXECUTION
A. Examine structural sub-floor for unevenness,
irregularities and dampness that would affect the quality
and execution of the work. Do not proceed with installation
until structural floor surfaces are level, clean and dry.
B. Concrete sealers, if used, shall be identified
and proven to be compatible with pedestal adhesive.
C. Verify dimensions on contract drawings, including
interfaces such as abutting floor, ledges and door sills.
A. Pedestal locations shall be established from
approved shop drawings so that mechanical and electrical work
can be installed without interfering with pedestal installation.
B. Installation of access floor and underfloor
supply air shall be coordinated with other trades to maintain
the integrity of the installed system. Traffic shall
not be allowed on any of the floor area for 24 hours to allow
the pedestal adhesive to set.
C. Floor system and accessories shall be installed
under the supervision of the manufacturer's authorized
representative and according to manufacturer's recommendations.
D. No dust or debris-producing operations by other
trades shall be allowed in areas where access floor is
being installed to ensure proper bonding of pedestals to subfloor.
E. Sub-floor shall be kept broom-clean as installation progresses.
F. Partially complete floors shall be braced against shifting
to maintain the integrity of the installed system.
G. Additional pedestals as needed shall support
panels where floor is disrupted by columns, walls and
H. Understructure shall be aligned such that all
uncut panels are interchangeable and fit snugly but do
not bind when placed in alternate positions.
I. Finished floor shall be level, not varying
more than 0.062" in 10' or 0.100" overall.
system shall be free of vibration, rocking, rattles, squeaks
and other unacceptable performance.
K. Plenum dividers: Shall be accurately scribed
and fit to the subfloor and sealed with mastic to ensure
maintenance of plenum effect. Include gaskets and sealant
to ensure airtight seal where holes are cut for penetration.
L. Air Diffuser: Shall be installed in one of four quadrants
of a standard 24" x 24" access floor panel utilizing a factory
cutout to ensure proper tolerances. Trim frame
shall be placed in factory cutout and secured to panel
M. Cut panel:
cutouts required for services penetrating
2. Cut panels to fit walls
and columns where required.
3. Seal cut edges with waterproof cement sealer to
4. Cover interior cut edges
with grommets, plastic trim, molding and/or gaskets
N. Acceptance: General contractor shall
accept floor in whole or in part prior to allowing use by
3.03 Cleaning, Protection and Grounding After Completion
of Installation - By Others
A. Vacuum clean the entire system.
B. Before any equipment is moved across the access
floor, the floor shall be protected by 1/2" plywood.
C. Electrical contractor shall connect the access
floor to building ground as follows: A #12 AWG bare
grounding wire shall be attached to one pedestal every 3,000
to 4,000 sq. ft. and run to the building ground.