APPENDIX K SECTION 10270 - ACCESS FLOORING.pdf

NORTHERN CALIFORNIA TRACON FACILITY JUNE 1997

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SECTION 10270 - ACCESS FLOORING

PART 1 - GENERAL

1.1 SUMMARY

A. This Section includes the following:

1. Gravity-held panels on bolted stringer understructure.

2. Grounding accessories for tie-in to Work of Section 16452 “Grounding.”

B. Related Sections: The following Sections contain requirements that relate to this Section:

1. Section 03300 "Cast-in-Place Concrete."

2. Section 15783 “Computer Room Air Handling Units.”

3. Section 16452 "Grounding."

1.2 REFERENCE STANDARDS

A. American Society for Testing and Materials (ASTM)

1. D 2859 - Test Method for Flammability of Finished Textile Floor Covering Materials

2. E 648 - Standard Test Method for Critical Radiant Flux of Floor-Covering Systems Using a Radiant Heat

Energy Source.

3. E 699 - Standard Criteria for Evaluation of Agencies Involved in Testing, Quality Assurance, and

Evaluating Building Components in Accordance With Test Methods Promulgated by ASTM Committee

B. National Electrical Manufacturers Association (NEMA)

1. LD 3 - High Pressure Decorative Laminates

C. National Fire Protection Association (NFPA)

1. 75 - Standard for the Protection of Electronic Computer/Data Processing Equipment.

2. 99 - Health Care Facilities

1.3 PERFORMANCE REQUIREMENTS

A. Performance Requirements, General: Provide access flooring systems that comply with the following requirements:

1. Access flooring systems are proprietary portable systems composed of modular floor panels on elevated supports (understructures) forming accessible underfloor cavities (air spaces) to accommodate electrical and mechanical services.

2. Access flooring systems comply with performance requirements specified as determined by testing manufacturers' current standard products representing those indicated for this Project.

B. Structural Performance per CISCA A/F: Provide access flooring systems capable of supporting the following loads, within limits and under conditions indicated, as demonstrated by testing according to the referenced procedures in Ceilings and Interior Systems Construction Association's (CISCA) "Recommended Test Procedures for Access Floors." This publication and its procedures are referenced elsewhere in this Section as CISCA A/F.

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1. Concentrated-Load Performance: Capability of floor panels, including those with cutouts, to support concentrated design loads of the following magnitude, with a top-surface deflection under load and a permanent set not to exceed, respectively, 0.10 and 0.010 inch, according to CISCA A/F Section I.

a. 1250 lbf.

3. Ultimate-Load Performance: Capability of access flooring systems to support a minimum ultimate concentrated load equal to the value obtained by multiplying the specified concentrated floor panel design load by the factor indicated below, without failing, according to CISCA A/F Section II. Failure is defined as the point at which the access flooring system will not take any additional load.

a. Factor: 2.

4. Rolling-Load Performance: Capability of access flooring system to withstand rolling loads of the following magnitude applied to panels, with a combination of local and overall deformation not to exceed

0.040 inch after exposure to rolling load over CISCA A/F path A or B, whichever path produces the greatest top-surface deformation, according to CISCA A/F Section III.

a. CISCA A/F Wheel 1 rolling load indicated below:

1) 600 lbf.

b. CISCA A/F Wheel 2 rolling load indicated below:

1) 600 lbf.

5. Stringer Concentrated-Load Performance: Capability of stringers, without panels in place, to support a concentrated load of 200 lbf at center of span with a permanent set not to exceed 0.010 inch, as determined per CISCA A/F Section IV.

6. Pedestal Axial-Load Performance: Capability of pedestal assemblies, without panels or other supports in place, to withstand the following axial load per pedestal, according to CISCA A/F Section V.

a. 5000 lbf.

7. Pedestal Overturning-Moment Performance: Capability of pedestal assemblies, without panels or other supports in place, to withstand the following overturning moment per pedestal, according to CISCA A/F Section VI.

a. 1000 lbf x inches.

C. Floor Panel Impact-Load Performance: Capability of access flooring system to withstand the following impact load when dropped from 36 inches onto a 1-sq. in. area located anywhere on panel, without failing. Failure is defined as the point at which the access flooring system will not take any additional load.

1. 125 lbf.

D. Seismic Performance: Capability of access flooring to withstand lateral forces (Fp) in Seismic Zone 4, according to requirements of the California Building Code in effect for this Project's building type.

E. Panel to Understructure Resistance: Not more than 10 ohms.

F. Electrical Resistance: Not less than 2.5 x 104 ohms, nor more than 1.0 x 108 ohms, as determined by testing identical products according to the method for conductive flooring specified in Chapter 12 of NFPA 99, Rtt, RTG, point-to-point (diagonal corner-to-corner across face of panel), point-to-ground, and tile-to-tile. Tile-to-tile

Chanh Huynh Highlight

Chanh Huynh Highlight

Chanh Huynh Highlight

Chanh Huynh Highlight

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December 23, 1997 9:33 AM method shall be tested across the seams. Total combined electrical resistance at the floor covering systems shall include carpet tile, adhesive, foil, connectors, clips, access floor panels, and pedestal heads, to groundable point, and shall be less than 1.0 x 108 when tested in accordance with NFPA 99. Rtt, RTG. Conduct test measurements at five different locations at installed area.

1.4 SUBMITTALS

A. Product Data for each type of access flooring specified.

B. Shop Drawings showing complete layout of access flooring based on field-verified dimensions; include dimensional relationships to adjoining work and installation tolerances. Include details, with descriptive notes indicating materials, finishes, fasteners, typical and special edge conditions, accessories, understructure, and other data to permit a full evaluation of entire access flooring system.

C. Samples for initial selection in the form of manufacturer's color charts consisting of actual units or sections of units showing the full range of colors, textures, and patterns available for each type of floor covering and exposed finish indicated.

D. Samples for verification in full-size units of each type of floor covering and exposed finish indicated.

1. In addition, submit one complete full-size floor panel, pedestal, and understructure unit for each type of access flooring system required.

E. Qualification data for firms and persons specified in the "Quality Assurance" Article to demonstrate their capabilities and experience. Include lists of completed projects with project names and addresses, names and addresses of architects and owners, and other information specified.

F. Product test reports from a qualified independent testing agency evidencing compliance of access flooring with system performance requirements based on comprehensive testing of current products performed either by the qualified independent testing agency or by the access flooring manufacturer and witnessed by the qualified independent testing agency.

G. Data on earthquake-load resistance in the form of structural computations that have been signed and sealed by a qualified professional engineer responsible for their preparation. Include structural computations, material properties, and other information needed for structural analysis and for verification that system will withstand earthquake loads indicated.

H. Certification: Certify that electrical resistance of the grounded flooring and floor covering system complies with performance requirements specified when tested in accordance with NFPA 99 test methods.

1.5 QUALITY ASSURANCE

A. Installer Qualifications: Engage an experienced Installer who is approved by the access flooring manufacturer for installing the types of access flooring indicated for this Project.

B. Testing Agency Qualifications: To qualify for approval, an independent testing agency must demonstrate to Architect's satisfaction, based on evaluation of agency-submitted criteria conforming to ASTM E 699, that it has the experience and capability to satisfactorily conduct the testing indicated without delaying the Work.

C. Single-Source Responsibility: Obtain access flooring from one source and by a single manufacturer.

D. Professional Engineer Qualifications: A professional engineer who is legally authorized to practice in the jurisdiction where Project is located and who is experienced in providing engineering services of the kind

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December 23, 1997 9:33 AM indicated. Engineering services are defined as those performed for installations of access flooring systems that are similar to that indicated for this Project in material, design, and extent.

E. NFPA Standard: Provide access flooring complying with NFPA 75 requirements for raised flooring.

F. Provide floor panels that are clearly and permanently marked on their underside with the panel type and concentrated-load rating.

G. Mockups: Prior to installing access flooring, construct mockups for each type of panel and understructure required to verify selections made under Sample submittals and to demonstrate aesthetic effects as well as qualities of materials and execution. Build mockups to comply with the following requirements, using products indicated for final access flooring installation.

1. Locate mockups on-site, in the location and of the size indicated or, if not indicated, as directed by COR.

2. Notify COR one week in advance of the dates and times when mockups will be constructed.

3. Obtain COR's approval of mockups before start of final unit of Work.

4. Retain and maintain mockups during construction in an undisturbed condition as a standard for judging the completed Work.

a. When directed, demolish and remove mockups from Project site.

1.6 DELIVERY, STORAGE, AND HANDLING

A. Deliver access flooring components in original, unopened packages, clearly labeled with manufacturer's name and item description.

B. Handle and store packages containing access flooring in a manner which avoids overloading building structure.

1.7 PROJECT CONDITIONS

A. Environmental Conditions: Do not proceed with installation of access flooring until installation area is enclosed and has an ambient temperature of between 40 and 90 deg F and a relative humidity of not more than 70 percent.

B. Field Measurements: Check actual locations of walls and other construction to which access flooring must fit by accurate field measurements before preparing Shop Drawings; show recorded measurements on Shop Drawings.

Coordinate fabrication schedule with construction progress to avoid delaying the Work.

1. Where field measurements cannot be made without delaying the Work, guarantee dimensions and proceed with preparing Shop Drawings for access flooring without field measurements. Coordinate construction to ensure that actual dimensions correspond to guaranteed dimensions.

1.8 COORDINATING AND SCHEDULING

A. Coordination of Work: Coordinate location of mechanical and electrical work in underfloor cavity to prevent interference with access flooring pedestals.

B. Mark pedestal locations with a grid of size indicated below on concrete subfloor so that mechanical and electrical work can proceed without interfering with pedestals.

1. 120 by 120 inches.

C. Do not proceed with installation of access flooring until after Substantial Completion of other construction within affected spaces.

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1.9 EXTRA MATERIALS

A. Furnish extra materials described below that match products installed, are packaged with protective covering for storage, and are identified with labels clearly describing contents.

1. Field Panels and Understructure: Furnish quantity of standard field panels and understructure components equal to 2 percent of amount installed.

PART 2 - PRODUCTS

2.1 MANUFACTURERS

A. Available Manufacturers: Subject to compliance with requirements, manufacturers offering access flooring that may be incorporated in the Work include, but are not limited to, the following:

1. Systems with Cementitious-Filled Formed-Steel Panels:

a. Mult-A-Frame Corporation.

b. Tate Access Floors, Inc.

c. USG Interiors, Inc.; Access Floor Systems.

2.2 FLOOR PANELS

A. General: Provide modular field panels complying with the following requirements that one person, using a portable lifting device, can interchange with other field panels without disturbing adjacent panels or understructure and that are free of exposed-metal edges with floor covering in place.

1. Nominal Panel Size: 24 by 24 inches.

2. Fabrication Tolerances: Fabricate panels to the following tolerances with squareness tolerances expressed as the difference between diagonal measurements from corner to corner.

a. Size and Squareness: Plus or minus 0.015 inch of required size, with a squareness tolerance of plus or minus 0.015 inch, unless tolerances are otherwise indicated for a specific panel type.

b. Flatness: Plus or minus 0.020 inch, measured on a diagonal on top of panel.

4. Panel Attachment to Understructure: By gravity.

5. Method of Panel Attachment to Understructure: By bolting to pedestal heads. 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.

B. Cementitious-Filled Formed-Steel Panels: Cementitious-filled panels fabricated with die-cut flat top sheet and die-formed and stiffened bottom pan formed from cold-rolled steel sheet and joined together by resistance welding to form an enclosed assembly, with metal surfaces protected against corrosion by manufacturer's standard factory-applied finish.

2.3 CARPET TILE

A. Fire-Test-Response Characteristics: Provide carpet tile with the following fire-test-response characteristics as determined by testing identical products per test method indicated below by UL or another testing and inspecting agency acceptable to authorities having jurisdiction. Identify carpet tile with appropriate markings of applicable testing and inspecting agency.

1. Surface Flammability: Passes CPSC 16 CFR, Part 1630.

2. Critical Radiant Flux Classification: Class I, not less than 0.45 W/sq. cm per ASTM E 648.

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3. Critical Radiant Flux Classification: Class II, not less than 0.22 W/sq. cm per ASTM E 648.

4. Flame Spread: 25 or less per ASTM E 84.

5. Smoke Developed: 450 or less per ASTM E 84.

6. Groundable Path: Grounding clip/bolt.

B. Known Acceptable Source: As indicated in Interior Finish Material Schedule.

C. Concrete-Slab Primer: Nonstaining type as recommended by carpet tile manufacturer.

D. Trowelable Underlayments and Patching Compounds: As recommended by carpet tile manufacturer.

E. Adhesives: Water-resistant, mildew-resistant, nonstaining, conductive, releasable type to suit products and subfloor conditions indicated and to comply with flammability requirements for installed carpet tile as recommended by carpet tile manufacturer. Known Acceptable Source: CompuRelease RTG, conductive, releasable adhesive as manufactured by United Technical Products, Inc. Electrical Resistance of the adhesive:

1.0 x 106 ohms Rtt max.

F. Groundable Path: Copper foil strip, 2 inches wide by 24 inches long by 5 mm thick, embedded in conductive adhesive and clamped to pedestals. Known Acceptable Source: RTG Connector - 5 mm Conductive Copper Foil Strip With Clamp, as manufactured by United Technical Products, Inc.

2.4 UNDERSTRUCTURE

A. Pedestals: Assembly consisting of base, column with provisions for height adjustment, and head (cap); made of steel or aluminum or a combination of both.

1. Base: Square or circular base with not less than 16 sq. in. of bearing area.

2. Provide vibration-proof leveling mechanism for making and holding fine adjustments in height over a range of not less than 2 inches. Include means of locking leveling mechanism at a selected height that requires deliberate action to change height setting and prevents vibratory displacement.

3. Provide units of sufficient height to achieve underfloor clearance indicated.

4. Head: Designed for direct, bolted support of floor panels.

a. Provide fasteners and fittings for bolting panels to pedestals.

b. Provide head with 4 holes aligned with holes in floor panels for positive bolting of panels to pedestals.

c. Provide fasteners which are held captive to panels.

5. Postinstalled Expansion Anchors: Where required to comply with performance requirements, provide expansion anchors for bolting pedestal bases to subfloor that have the capability to sustain, without failure, a load equal to 5 times that specified under Part 1 Article "Performance Requirements."

B. Stringer Systems: Modular steel stringer systems made to interlock with pedestal heads and form a grid pattern placing stringers under each edge of each floor panel and a pedestal under each corner of each floor panel.

Protect steel components with manufacturer's standard galvanized or corrosion-resistant paint finish.

1. Bolted Stringers: System of main and cross stringers connected to pedestals with threaded fasteners accessible from above.

2.5 ACCESSORIES

A. Colors and Finishes: For exposed accessories available in more than one standard color or finish, provide color or finish complying with the following requirements:

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1. Comply with Interior Finish Material Schedule.

B. Cutouts: Provide cutouts in floor panels for cable penetrations and service outlets. Comply with requirements indicated for size, shape, number, and location. Provide reinforcement or additional support, if needed, to make panels with cutouts comply with standard performance requirements.

1. Trim edge of cutouts with manufacturer's standard plastic molding.

2. Fit cutouts with manufacturer's standard grommets in sizes indicated or, where size of cutouts exceed maximum grommet size available, trim edge of cutouts with manufacturer's standard plastic molding having tapered top flange.

a. Furnish removable covers for grommets.

b. Furnish removable twist-close covers.

3. Seal cutouts to comply with manufacturer's requirements.

4. Provide foam-rubber pads for sealing annular space formed in cutouts by cables and trim edge of cutout with molding having flange and ledge for capturing and supporting pads.

C. Service Outlets: Standard UL-listed and -labeled assemblies, for recessed mounting flush with top of floor panels, for power, communication, and signal services, and complying with the following requirements:

1. Structural Performance: Cover capable of supporting a 1000-lbf concentrated load.

2. Cover and Box Type: Hinged polycarbonate cover with opening for passage of cables when cover is closed and including frame and steel box or formed-steel plate for mounting electrical receptacles, telephone amphenol connectors and signal cables.

3. Location: Locate outlets in center of panel quadrant.

4. Receptacles and Wiring: Electrical receptacles and wiring for service outlets are specified in Division 16

Sections.

a. Type of Receptacle: Heavy-duty duplex, 2-pole, 3-wire grounding, 20 A, 125 V, NEMA configuration 5-20R, unless otherwise indicated.

b. Number of Receptacles for Outlet: 4.

c. Wiring Method: Power-in connectors, built into outlet housing, of type to fit power-in and power-out connectors of branch circuit cables supplied with building electrical system.

D. Plastic Floor Grilles with Dampers: Standard load-bearing grilles molded from polycarbonate plastic to produce removable one-piece unit precisely fitted in factory-prepared openings of standard field panels, with adjustable/removable damper blades and complying with requirements indicated below:

1. Air-Distribution Characteristics: 468 cfm at 0.10-inch wg static pressure.

2. Structural Performance: Capable of supporting a 1000-lbf concentrated load.

3. Fire-Performance Characteristics: Classified 94V-0 per UL 94.

E. Perforated Panels: Standard load-bearing perforated metal panels interchangeable with standard field panels and complying with the following requirements:

1. Air-Distribution Characteristics of Units Without Dampers: Capable of delivering 722 cfm at 0.10-inch wg static pressure.

2. Air-Distribution Characteristics of Units with Dampers: Provide units with air-volume control dampers, adjustable from top surface, capable of delivering 540 cfm at 0.10-inch wg static pressure with damper full open.

3. Structural Performance: Capable of supporting a 1250-lbf concentrated load.

4. Floor Covering: HPDL. At field areas with carpet tile, field cut carpet tile to expose perforations and to permit full air flow.

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5. Number of Grilles: As indicated.

H. Cavity Dividers: Provide manufacturer's standard metal dividers located where indicated to divide underfloor cavities. Provide fire-rated dividers where shown.

I. Vertical Closures (Fascia): Where underfloor cavity is not enclosed by abutting walls or other construction, provide manufacturer's standard metal-closure plates with factory-applied finish.

J. Panel Lifting Device: Manufacturer's standard portable lifting device of type and number required for lifting panels with floor covering provided.

1. Provide 4 lifting devices of each type required.

K. Perimeter Support: Where indicated, provide manufacturer's standard method for supporting panel edge and form transition between access flooring and adjoining floor covering at same level as access flooring.

PART 3 - EXECUTION

3.1 PREPARATION

A. Preinstallation Adhesive Field Test: Prior to installing pedestals, field test their adhesion to subfloor surfaces as follows:

1. In areas representative of each subfloor surface, set typical pedestal assemblies in same adhesive and methods required for completed work.

2. Allow test installation to cure for 30 days, with a pressure of 25 lbf applied vertically to pedestals during this period.

3. After curing, apply lateral load against a straight steel bar inserted 2 inches into pedestal stems. Measure the force needed to cause adhesive failure of pedestal base.

4. Do not proceed with installation until tests show compliance with the performance requirement specified for pedestal's capability to resist overturning moment.

B. Locate each pedestal, complete any necessary subfloor preparation, and vacuum clean the subfloor to remove dust, dirt, and construction debris before beginning installation.

3.2 INSTALLATION

A. Install access flooring system and accessories under supervision of the access flooring manufacturer's authorized representative to produce a rigid, firm installation that complies with performance requirements and is free of vibration, rocking, rattles, and squeaks.

B. Set pedestals in adhesive as recommended by the access flooring manufacturer to provide full bearing of the pedestal base on the subfloor.

C. Attach pedestals to subfloor by postinstalled expansion anchors.

D. Lay out floor panel installation to keep the number of cut panels at the floor perimeter to a minimum. Scribe perimeter panels to provide a close fit with adjoining construction with no voids greater than 1/8 inch where panels abut vertical surfaces.

1. To prevent dusting, seal cut edges of the following panel type with sealer recommended by panel manufacturer:

a. Steel-covered wood-core panels.

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b. Filled formed-steel panels.

2. Connect conductive copper grounding strips, fully embedded in static-conductive floor covering, to connector clips attached to pedestals at maximum 3,000 square feet or smaller areas as needed to comply with performance requirements for electrical resistance of floor covering.

E. Secure stringers to pedestal heads according to the access flooring manufacturer's instructions.

F. Scribe underfloor-cavity dividers to closely fit against subfloor surfaces and seal with mastic to maintain plenum effect within underfloor cavity.

G. Scribe vertical closures to closely fit against subfloor and adjacent finish floor surfaces. Set in mastic and seal to maintain plenum effect within underfloor cavity.

H. Clean dust, dirt, and construction debris caused by floor installation, including vacuuming the subfloor area, as installation of floor panels proceeds.

I. Do not cut and trim access flooring components or perform other dirt-or-debris-producing operations in the rooms where the floor is being installed.

J. Cut and trim access flooring and perform other dirt-or-debris-producing operations as remotely as possible from installation area and to prevent contamination of subfloor under access flooring already installed.

K. Level installed access flooring to within 0.10 inch of true level over the entire access flooring area and within

0.062 inch in any 10-foot distance.

M. Carpet tile to be freelayed as per manufacturer’s recommendations.

3.3 ADJUSTING, CLEANING, AND PROTECTION

A. After completing installation, vacuum clean access flooring and cover with continuous sheets of reinforced paper or plastic. Maintain protective covering until the time of Substantial Completion.

B. Replace access flooring panels that are stained, scratched, otherwise damaged, or not complying with specified requirements.

END OF SECTION 10270