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SECTION 10270
PART 1 - GENERAL
1.1 Section Includes
- Work of this section includes, but is not limited to:
access floor panels, floor coverings, understructure and
various electrical, data and communication accessories.
1.2 Related Sections
- General contractor shall provide clear
access, dry secure storage, and a clean subfloor
area which is free of construction debris and
other trades during installation of the access
floor system. Area to receive the access floor
shall be enclosed and be maintained at a
temperature range of 40° to 90° F and a humidity
range of 20% to 70% relative.
- Concrete sealer shall be compatible with
pedestal adhesive, see Division
3.
- Electrical contractor shall provide
necessary material and labor to
electrically connect the access floor to the building,
see Division 16.
1.3 References
- CISCA (Ceilings & Interior Systems Construction
Association) - "Recommended Test Procedures for Access
Floors" shall only be used as a guideline when presenting
load performance product information.
1.4 Performance Requirements
Pedestals:
- Axial Load: Pedestal assembly
shall provide an 8000 lb. axial load without
permanent deformation.
- Overturning Moment: Pedestal assembly shall provide
an average overturning moment of 1000 in-lbs. when glued
to a clean, sound, uncoated concrete surface.
Stringers:
- Midspan Concentrated Load: Stringer shall be
capable of withstanding a concentrated load of 450lbs.
placed in the midspan stringer center on a one square
inch area using a round or square indentor without exceeding
a permanent set of 0.010 inches after the load is removed.
Floor Panels:
- Concentrated Load: Panel shall be
capable of supporting a concentrated load of
2500 lbs. placed on a one square inch area
(using a round or square indentor) at any
location on the panel with a maximum top surface
deflection of 0.100 inches. Panel shall not
exceed a permanent set of 0.010 inches, after
the load is removed.
- Uniform Load: Panel shall be
capable of supporting a uniform load of 625 lbs.
placed on a one square foot area at any location
on the panel with a maximum top surface
deflection of 0.040 inches. Panel shall not
exceed a permanent set of 0.010 inches, after
the load is removed
- Ultimate Load: Panel shall be
capable of withstanding a minimum load equal to
2½ times the panel's concentrated load rating
applied onto a one square inch area (using a
round or square indentor) at any location on the
panel without failure. Failure is defined as the
point at which the panel will no longer accept
the load.
- Rolling Load: Panel and supporting understructure
shall be able to withstand the following rolling loads
at any location on the panel without developing a local
and overall surface deformation greater than 0.040 inches.
Note: wheel 1 and wheel 2 tests shall be performed
on two separate panels.
Wheel 1: Size: 3" dia x 1 13/16" wide Load: 2000 lbs.
Passes: 10
Wheel 2: Size: 6" dia x 1 1/2" wide Load: 1600 lbs.
Passes: 10,000
- Impact Load: Panel and supporting
understructure shall be capable of supporting an
impact load of 150 lbs. dropped from a height of
12 inches onto a one square inch area (using a
round or square indentor) at any location on the
panel with a maximum deformation of 0.060
inches, after which it shall continue to meet
all load performance requirements as previously
defined.
- Panel Drop Test: Panel shall be capable of being
dropped face up onto to a concrete slab from a height
of 36", after which it shall continue to meet all load
performance requirements as previously defined.
1.5 Design Requirements:
- Access floor system, where indicated on
the design documents, shall consist of modular
and removable cementitious filled welded steel
panels supported on all four edges by structural
steel members which are designed to bolt onto
adjustable height pedestal assemblies forming a
modular grid pattern.
- Panel shall be easily removed by one
person with a lifting device and shall be
interchangeable except where cut for special
conditions.
- Quantities, finished floor heights (FFH) and location
of accessories shall be as specified on the contract drawings.
1.6 Submittals for Review
- Detail sheets, for each proposed product
type, which provide the necessary information to
describe the product and its performance.
- Test reports, by an independent testing laboratory,
certifying that component parts perform as specified.
1.7 Submittals for Information
- Manufacturer's installation instructions
and guidelines.
- Manufacturer's Owner Manual outlining recommended care
and maintenance procedures.
PART 2 - PRODUCTS
2.1 Manufacturers
- Access floor system shall be as
manufactured by Tate Access Floors, Inc. and
shall consist of the ConCore® 2500 panel
supported by a bolted stringer understructure
system. System is distributed by Pugliese
Interior Systems, Inc., 1 Bendix, Irvine, CA.
92618. (949) 837-9194.
- Alternative products shall meet or exceed the feature
requirements as indicated herein and the performance requirements
as outlined in section 1.4 and must receive prior written
approval by the architect or designer.
2.2 Support Components
Pedestals:
- Pedestal assemblies shall be corrosive
resistant, all steel welded construction, and
shall provide an adjustment range of +/- 1" for
finished floor heights 6" or
greater.
- Pedestal assemblies shall provide a means
of leveling and locking the assembly at a
selected height, which requires deliberate
action to change height setting and prevents
vibration displacement.
- Galvanized steel pedestal head shall be
fillet welded to a threaded rod which includes a
specially designed adjusting nut. The nut shall
provide location lugs to engage the pedestal
base assembly, such that deliberate action is
required to change the height
setting.
- Threaded rod shall provide a specially
designed anti-rotation device, such that when
the head assembly is engaged in the base
assembly, the head cannot freely rotate (for FFH
of 6" or greater).
- Pedestal base assembly shall consist of a formed galvanized
steel plate with no less than 16 inches of bearing area,
welded to a 7/8" square galvanized steel tube and shall
be designed to engage the head assembly.
Stringers:
- Stringers shall support each edge of
panel.
- Stringer shall be galvanized steel and
shall have a conductive material for sound
deadening.
- Stringers shall be individually and
rigidly fastened to the pedestal with one
machine screw for each foot of stringer length.
Bolts shall provide positive electrical contact
between the stringers and pedestals. Connections
depending on gravity or spring action are
unacceptable.
- Stringer grid shall be 4' stringers in a basketweave
configuration ensuring maximum lateral stability in all
directions.
2.3 Panel Components
Floor Panels:
- Panels shall consist of a top steel sheet
welded to a formed steel bottom pan
filled internally by a lightweight cementitious
material. Mechanical or adhesive methods for
attachment of the steel top and bottom sheets is
unacceptable.
- Cementitious fill material shall be
totally encased within the steel welded shell
except where cut for special
conditions.
- Panel shall have an electrically conductive epoxy paint
finish.
2.4 Accessories
- Service outlets boxes to be provided in
locations and as detailed on the contract
drawings. Outlets shall be UL listed access
floor boxes capable of accommodating power,
voice, and data cables and termination points.
The service outlet box shall be a drop-in design
having a hinged Lexan lid with cable hooks and
capable of supporting a 1,000 lb. concentrated
load.
- Provide manufacturer's standard steps,
ramps, fascia plate, perimeter support, and
grommets where indicated on the contract
drawings.
- Provide __________ spare floor panels and
__________ square feet of understructure systems
for each type used in the project for
maintenance stock. Deliver to project in
manufacturer's standard packaging clearly marked
with the contents.
- Provide _________ panel lifting
devices.
- When applicable provide manufacturer's standard underfloor
air systems components (including Task Air Modules, grilles,
diffusers and perforated floor panels) where indicated
on the contract drawings.
2.5 Finishes
- Finish the surface of floor panels with
floor covering material as indicated on the
contract drawings. Where floor coverings are by
the access floor manufacturer, the type, color
and pattern shall be selected from
manufacturer's standard.
- Vinyl edge trim for the tile coverings shall be mechanically
locked and bonded to the panel surface and flush with
the surface covering.
2.6 Fabrication Tolerances
- Floor panel flatness: 0.030" in any
direction.
- Floor panel width or length from
specified size: +/- 0.010"
- Floor panel squareness: +/- 0.015"
PART 3 - EXECUTION
3.1 Examination
- Examine structural subfloor 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 as completed by others.
- Concrete sealers, if used, shall be
identified and proven to be compatible with
pedestal adhesive. If other than manufacturer's
recommended adhesives or sealers are used,
verify that adhesive achieves bond to slab
before commencing work.
- Verify dimensions on contract drawings, including level
of interfaces including abutting floor, ledges and doorsills.
3.2 Installation
- Pedestal locations shall be established from approved
shop drawings so that mechanical and electrical work can
be installed without interfering with pedestal installation.
- Installation of access floor shall be coordinated with
other trades to maintain the integrity of the installed
system. Traffic shall not be permitted on any floor area
for 24 hours to allow the pedestal adhesive to set.
- Floor system and accessories shall be installed under
the supervision of the manufacturer's authorized representative
and according to manufacturer's recommendations.
- 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.
- Access floor installer shall keep the subfloor broom
clean as installation progresses.
- Partially complete floors shall be braced against shifting
to maintain the integrity of the installed system where
required.
- Additional pedestals as needed shall support panels
where floor is disrupted by columns, walls, and cutouts.
- Understructure shall be aligned such that all uncut
panels are interchangeable and fit snugly but do not bind
when placed in alternate positions.
- Finished floor shall be level, not varying more than
0.062" in 10 feet or 0.100" overall.
- Acceptance: General contractor shall accept floor in
whole or in part prior to allowing use by other trades.
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