096900

096900
SECTION 096900
ACCESS FLOORING
PART 1 - GENERAL
1.1
RELATED DOCUMENTS
A.
1.2
Drawings and General Provisions of the Contract, including General and Supplementary
Conditions and Division 01 Specification Sections, apply to this Section.
SUMMARY
A.
B.
1.3
Section Includes:
1.
Access-flooring panels.
2.
Understructure.
Related Requirements:
1.
Division 09 – Floor Finish Sections for finish flooring.
2.
Division 23 for mechanical air distribution.
3.
Division 26 for electrical connections and grounding.
COORDINATION
A.
Coordinate location of mechanical and electrical work in underfloor cavity to prevent
interference with access-flooring pedestals.
B.
Mark pedestal locations on subfloor using a grid to enable mechanical and electrical work
to proceed without interfering with access-flooring pedestals.
1.4
PREINSTALLATION MEETINGS
A.
Preinstallation Conference: Conduct conference at Project site.
1.
Review connection with mechanical and electrical systems.
2.
Review requirements related to sealing the plenum.
3.
Review procedures for keeping underfloor space clean.
11.001-096900-1
12/12/12
1.5
ACTION SUBMITTALS
A.
Product Data: For each type of product.
B.
LEED Submittals:
C.
1.
Product Data for Credit IEQ 4.1:
For pedestal-installation adhesives,
documentation including printed statement of VOC content.
2.
Product Data for Credit IEQ 4.3:
For pedestal-installation adhesives,
documentation including printed statement of VOC content.
Shop Drawings: Include layout of access-flooring system and relationship to adjoining
Work based on field-verified dimensions.
1.
D.
1.6
Details and sections with descriptive notes indicating materials, finishes,
fasteners, typical and special edge conditions, accessories, and understructures.
Samples for Verification: For the following products:
1.
Exposed Metal Accessories: Approximately 10 inches (250 mm) in length.
2.
One complete full-size floor panel, pedestal, and understructure unit for each
type of access-flooring system required.
INFORMATIONAL SUBMITTALS
A.
Qualification Data: For Installer.
B.
Product Certificates: For each type of access-flooring system.
C.
Product Test Reports: For each type of flooring material and exposed finish, for tests
performed by a qualified testing agency.
1.7
QUALITY ASSURANCE
A.
1.8
Installer Qualifications: An entity that employs installers and supervisors who are trained
and approved by manufacturer.
FIELD CONDITIONS
A.
Environmental Limitations: Do not install access flooring until spaces are enclosed,
subfloor has been sealed, ambient temperature is between 50 and 90 deg F (10 and 32
deg C), and relative humidity is not less than 20 and not more than seventy (70%)
percent.
11.001-096900-2
12/12/12
PART 2 - PRODUCTS
2.1
PERFORMANCE REQUIREMENTS
A.
Structural Performance: Provide access-flooring systems capable of complying with the
following performance requirements according to testing procedures in CISCA's
"Recommended Test Procedures for Access Floors":
1.
Concentrated Loads:
permanent set:
a.
b.
Ultimate Loads: 1800 lbf (8006 N).
3.
Rolling Loads: With local or overall deformation not to exceed 0.040 inch (1.02
mm).
CISCA Wheel 1: 10 passes at 1200 lbf (5338 N).
CISCA Wheel 2: 10,000 passes at 800 lbf (3559 N).
4.
Stringer Load Test: 450 lbf (2002 N) at center of span with a permanent set not
to exceed 0.010 inch (0.25 mm).
5.
Uniform Load Test: 600 lbf/sq. ft. with a maximum top-surface deflection not to
exceed 0.040 inch (1.02 mm) and a permanent set not to exceed 0.010 inch (0.25
mm).
6.
Drop Impact Load Test: 150 lb (68.0 kg).
Fire Performance:
1.
Surface-Burning Characteristics: Comply with ASTM E 84; testing by a
qualified testing agency. Identify products with appropriate markings of
applicable testing agency.
a.
b.
2.
2.2
Top-Surface Deflection: 0.10 inch (2.54 mm).
Permanent Set: 0.010 inch (0.25 mm).
2.
a.
b.
B.
1250 lbf (5560 N) with the following deflection and
Flame-Spread Index: 25 or less.
Smoke-Developed Index: 50 or less.
Combustion Characteristics: ASTM E 136.
MANUFACTURERS
A.
Source Limitations:
manufacturer.
Obtain access-flooring system from single source from single
11.001-096900-3
12/12/12
2.3
FLOOR PANELS
A.
B.
Floor Panels, General: Provide modular panels interchangeable with other field panels
without disturbing adjacent panels or understructure.
1.
Size: Nominal 24 by 24 inches (610 by 610 mm).
2.
Attachment to Understructure: Bolted. At areas to receive stone tile floor finish,
use thread lock / adhesive at each bolt connection
Exposed-Concrete-Surface Panels: Fabricated with bottom pan that is die formed from
metallic-coated steel sheet and filled with lightweight concrete that is reinforced and
bonded to pan by shear ties.
1.
Manufacturers: Subject to compliance with requirements, provide products by
the following:
a.
2.4
Haworth, Inc.
UNDERSTRUCTURE
A.
Pedestals: Assembly consisting of base, column with provisions for height adjustment,
and head (cap); made of steel.
1.
Provide pedestals designed for use in seismic applications.
2.
Base: Square or circular base with not less than 16 sq. in. (103 sq. cm) of bearing
area.
3.
Column: Of height required to bring finished floor to elevations indicated. Weld
to base plate.
4.
Provide vibration-proof leveling mechanism for making and holding fine
adjustments in height over a range of not less than 2 inches (51 mm) and for
locking at a selected height, so deliberate action is required to change height
setting and prevent vibratory displacement.
5.
Head: Designed to support the panel system indicated.
a.
B.
Bolted Assemblies: Provide head with four holes aligned with holes in
floor panels for bolting of panels to pedestals.
Stringer Systems: Modular steel stringer systems designed to bolt to pedestal heads and
form a grid pattern. Protect steel components with manufacturer's standard galvanized or
corrosion-resistant paint finish.
1.
Continuous Gaskets: At contact surfaces between panel and stringers to deaden
sound, seal off the underfloor cavity from above, and maintain panel alignment
and position.
11.001-096900-4
12/12/12
2.5
FLOOR PANEL COVERINGS
A.
2.6
Floor panel coverings are specified in other Division 9 Sections.
FABRICATION
A.
Fabrication Tolerances:
1.
Size: Plus or minus 0.020 inch (0.50 mm) of required size.
2.
Squareness:
Plus or minus 0.015 inch (0.38 mm) between diagonal
measurements across top of panel.
3.
Flatness: Plus or minus 0.035 inch (0.89 mm), measured on a diagonal on top of
panel.
B.
Panel Markings: Clearly and permanently mark floor panels on their underside with
panel type and concentrated-load rating.
C.
Bolted Panels: Provide panels with holes drilled in corners to align precisely with
threaded holes in pedestal heads and to accept countersunk screws with heads flush with
top of panel.
1.
Use thread lock adhesive/seal to lock and seal threaded fasteners at all areas to
receive stone tile finish.
a.
D.
2.7
Product: Loctite "Threadlocker" nut and bolt locker.
Cutouts: Fabricate cutouts in floor panels for cable penetrations and service outlets.
Provide reinforcement or additional support, if needed, to make panels with cutouts
comply with structural performance requirements.
1.
Number, Size, Shape, and Location: As indicated.
2.
Grommets: Where indicated, fit cutouts with manufacturer's standard grommets;
or, if size of cutouts exceeds maximum grommet size available, trim edge of
cutouts with manufacturer's standard plastic molding with tapered top flange.
Furnish removable covers for grommets.
3.
Provide foam-rubber pads for sealing annular space formed in cutouts by cables.
ACCESSORIES
A.
Adhesives: Manufacturer's standard adhesive for bonding pedestal bases to subfloor.
1.
Adhesive shall have a VOC content of 70 g/L or less when calculated according
to 40 CFR 59, Subpart D (EPA Method 24).
11.001-096900-5
12/12/12
B.
Plenum-Wall Brush Grommets: Self-sealing cable brush grommet with 4-by-13-inch
(102-by-330-mm) rectangular or 3-inch (76-mm) round or 5-inch (127-mm) round usable
area for passage of power and signal cables through plenum walls. Frame of ABS plastic
or aluminum with passageway consists of intermediate layer of flexible EPDM rubber
and interwoven nylon filaments.
C.
Cavity Dividers: Provide manufacturer's standard metal dividers located where indicated
to divide underfloor cavities.
D.
Closures: Where underfloor cavity is not enclosed by abutting walls or other
construction, provide metal-closure plates with manufacturer's standard finish.
E.
Panel Lifting Device: Panel manufacturer's standard portable lifting device for each type
of panel required.
F.
Perimeter Support: Where indicated, provide manufacturer's standard method for
supporting panel edge and forming transition between access flooring and adjoining floor
coverings at same level as access flooring.
PART 3 - EXECUTION
3.1
EXAMINATION
A.
B.
3.2
Examine substrates, with Installer and manufacturer's representative present, for
compliance with requirements for installation tolerances and other conditions affecting
performance of the Work.
1.
Verify that substrates comply with tolerances and other requirements specified in
other Sections and that substrates are free of cracks, ridges, depressions, scale,
foreign deposits, and debris that might interfere with attachment of pedestals.
2.
Verify that concrete floor sealer and finish have been applied and cured.
Proceed with installation only after unsatisfactory conditions have been corrected.
PREPARATION
A.
Lay out floor panel installation to keep the number of cut panels at floor perimeter to a
minimum. Avoid using panels cut to less than 6 inches (152 mm).
B.
Locate each pedestal, complete any necessary subfloor preparation, and vacuum subfloor
to remove dust, dirt, and construction debris before beginning installation.
11.001-096900-6
12/12/12
3.3
INSTALLATION
A.
Install access-flooring system and accessories under supervision of access-flooring
manufacturer's authorized representative to produce a rigid, firm installation that
complies with performance requirements and is free of instability, rocking, rattles, and
squeaks.
B.
Adhesive Attachment of Pedestals: Set pedestals in adhesive, according to accessflooring manufacturer's written instructions, to provide full bearing of pedestal base on
subfloor.
C.
Adjust pedestals to permit top of installed panels to be set flat, level, and to proper height.
D.
Stringer Systems: Secure stringers to pedestal heads according to access-flooring
manufacturer's written instructions.
E.
Install flooring panels securely in place, properly seated with panel edges flush. Do not
force panels into place.
1.
F.
Install thread lock adhesive/seal at all anchors where stone tile floor finish will be
installed.
Scribe perimeter panels to provide a close fit with adjoining construction with no voids
greater than 1/8 inch (3 mm) where panels abut vertical surfaces.
1.
To prevent dusting, seal cut edges of steel-encapsulated, wood-core panels with
sealer recommended in writing by panel manufacturer.
G.
Cut and trim access flooring and perform other dirt-or-debris-producing activities at a
remote location or as required to prevent contamination of subfloor under alreadyinstalled access flooring.
H.
Grounded Flooring Access Panel Systems: Ground flooring system as recommended by
manufacturer and as needed to comply with performance requirements for electrical
resistance of floor coverings.
1.
Panel-to-Understructure Resistance:
without floor coverings.
Not more than 10 ohms as measured
I.
Underfloor Dividers: Scribe and install underfloor-cavity dividers to closely fit against
subfloor surfaces, and seal with mastic.
J.
Closures: Scribe closures to closely fit against subfloor and adjacent finished-floor
surfaces. Set in mastic and seal to maintain plenum effect within underfloor cavity.
K.
Clean dust, dirt, and construction debris caused by floor installation, and vacuum
subfloor area as installation of floor panels proceeds.
L.
Seal underfloor air cavities at construction seams, penetrations, and perimeter to control
air leakage, according to manufacturer's written instructions.
11.001-096900-7
12/12/12
M.
3.4
Install access flooring without change in elevation between adjacent panels and within
the following tolerances:
1.
Plus or minus 1/16 inch (1.5 mm) in any 10-foot (3-m) distance.
2.
Plus or minus 1/8 inch (3 mm) from a level plane over entire access-flooring
area.
PROTECTION
A.
Prohibit traffic on access flooring for twenty-four (24) hours and removal of floor panels
for seventy-two (72) hours after installation to allow pedestal adhesive to set.
B.
After completing installation, vacuum access flooring and cover with continuous sheets
of reinforced paper or plastic. Maintain protective covering until time of Substantial
Completion.
C.
Replace access-flooring panels that are stained, scratched, or otherwise damaged or that
do not comply with specified requirements.
END OF SECTION
11.001-096900-8
12/12/12
Was this manual useful for you? yes no
Thank you for your participation!

* Your assessment is very important for improving the work of artificial intelligence, which forms the content of this project

Download PDF

advertising