09 69 00 Access Flooring-Addenda 2.pdf

OGJVAMC FINAL BID DOCS- ADDENDA

IRON MOUNTAIN, MI 06/08/2022

OSCAR G. JOHNSON VA MEDICAL CENTER

ELECTRONIC HEALTH RECORDS

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ACCESS FLOORING

SECTION 09 69 00

PART 1 - GENERAL

1.1 DESCRIPTION

A. Access flooring is to consist of a series of modular, removable, interchangeable panels on an elevated support system forming an accessible underfloor cavity to accommodate electrical and mechanical services. System is to be bolted filled formed or cast panels on stringer understructure.

B. Work of this section includes, but is not limited to: access floor panels, static dissipative floor covering, understructure framing and various electrical, data and communication system accessories included as part of the access flooring.

C. The replacement of the existing access flooring system shall be done in segments as part of maintaining the data center in full operation 24/7/365. See telecommunication drawings for the phasing of the work.

Existing server and equipment racks shall be temporally supported in their existing locations where indicated on the drawings and cannot be shut down.

1.2 RELATED WORK

A. Section 01 81 13, SUSTAINABLE CONSTRUCTION REQUIREMENTS:

Sustainable Design Requirements.

B. Concrete sealer shall be compatible with pedestal adhesive, see

Division 3

C. Section 09 06 00, SCHEDULE FOR FINISHES: Color and Texture of

Finishes.

D. Section 27 05 26, GROUNDING AND BONDING FOR COMMUNICATIONS

SYSTEMS

E. See Division 26 Section 26 05 26 “Grounding and Bonding for

Electrical Systems” for connection to ground of access flooring understructure. A licensed electrical contractor shall provide

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09 69 00 - 2 of 25 the necessary labor and materials to electrically connect the access flooring to the building ground.

1.3 APPLICABLE PUBLICATIONS:

A. The Publications listed below (including amendments, addenda revisions, supplements and errata) form a part of this specification to the extent referenced. The publications are referenced in text by basic designation only.

B. American Concrete Institute (ACI):

355.2-19 ............. Qualification for Post-Installed Mechanical

Anchors in Concrete and Commentary

C. American Institute of Steel Construction (AISC):

Load and Resistance Factor Design, Volume 1, Second Edition

D. ASTM International (ASTM):

A36/A36M-19 .......... Standard Specification for Carbon

Structural Steel

A53/A53M-18 .......... Standard Specification for Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded and Seamless

A307-14e1 ............ Standard Specifications for Carbon Steel

Bolts, Studs, and Threaded Rod 60,000 PSI

Tensile Strength

A325-14 .............. Standard Specification for Structural

Bolts, Steel, Heat Treated, 120/105 ksi

Minimum Tensile Strength

A325M-14 ............. Standard Specification for High-Strength

Bolts for Structural Steel Joints [Metric]

A490-14a ............. Standard Specification for Heat-Treated

Steel Structural Bolts, 150 ksi Minimum

Tensile Strength

A490M-14a ............ Standard Specification for High-Strength

Steel Bolts, Classes 10.9 and 10.9.3, for

Structural Steel Joints [Metric]

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A500/A500M-18 ........ Standard Specification for Cold-Formed

Welded and Seamless Carbon Steel Structural

Tubing in Rounds and Shapes

A501/A501M-14 ........ Standard Specification for Hot-Formed

Welded and Seamless Carbon Steel

Structural Tubing

A615/A615M-20 ........ Standard Specification for Deformed and

Plain Carbon Steel Bars for Concrete

Reinforcement

A992/A992M-11(2015) .. Standard Specification for Steel for

Structural Shapes for Use in Building

Framing

A996/A996M-16 ........ Standard Specification for Rail Steel and

Axle Steel Deformed Bars for Concrete

Reinforcement

E488/E488M-18 ........ Standard Test Methods for Strength of

Anchors in Concrete Elements

E. American Society of Civil Engineers

1. Minimum Design Loads and Associated Criteria for Buildings and

Other Structures (ASCE 7) Edition as indicated in section 1.1

B of this specification. Associated Criteria for Buildings and

Other Structures (ASCE 7): 7-16

F. International Building Code (IBC) Edition as indicated in Section

1.1 B of this specification.

G. VA Handbook H18-8 Seismic Design Requirements, VA H-18-8, November 2019(REVISED MAY 1,2020)

H. National Uniform Seismic Installation Guidelines (NUSIG)

I. Sheet Metal and Air Conditioning Contractors National Association

J. (SMACNA): Seismic Restraint Manual - Guidelines for Mechanical

Systems, 3RD EDITION 2008 and Addendum

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K. CISCA (Ceilings & Interior Systems Construction Association) -

“Recommended Test Procedures for Access Floors” shall be used as a guideline when presenting load performance product information.

1.4 Performance Certification

A. Product tests requested by this specification section shall be witnessed and certified by independent engineering and testing laboratory based in the U.S. with a minimum of five years’ experience testing access floor components in accordance CISCA

“Recommended Test Procedures for Access Floors”.

1.5 DESIGN CRITERIA

A. Access floor system shall consist of modular and removable fully encased 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.

B. Panel shall be easily removed by one person with a suction cup lifting device and shall be interchangeable except where cut for special conditions.

C. Quantities, finished floor heights (FFH) and location of accessories shall be as specified on the contract drawings.

D. Access floor materials shall comply with the provisions outlined in FAR Subpart 25.2 – Buy American Act – Construction

Materials.

E. Floor panels shall be permanently marked with manufacturer’s name, product identification, manufacturing date and country-of-origin. Removable Product ID stickers are not acceptable.

F. Structural Performance per CISCA A/F: Provide access flooring systems capable of withstanding the following loads and stresses within limits and under conditions indicated, as determined by testing manufacturer's current standard products according to referenced procedures in CISCA:

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a. Ultimate-Load Performance: Provide access flooring systems capable of withstanding a minimum ultimate concentrated load equal to value obtained by multiplying specified concentrated floor panel design load by a factor of 2.5, without failing, according to CISCA A/F, Section II, "Ultimate Loading." Failure is defined as the point at which access flooring system will not take any additional load.

b. Rolling-Load Performance: Provide access flooring systems capable of withstanding rolling loads of the following magnitude applied to non-perforated panels, with a combination of local and overall deformation not to exceed 1.02 mm (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, "Rolling Loads."

c. Concentrated-Load Performance: Provide floor panels, including those with cutouts, capable of withstanding a concentrated design load of the following magnitude, with a top-surface deflection under load and a permanent set not to exceed, respectively, 2.03 and 0.25 mm (0.080 inch and 0.010 inch), according to CISCA A/F, Section I, “Concentrated Loads."

G. Floor Flatness and assembly criteria: Installed access floor is to be level within plus or minus 1.59 mm in 3.05 m (1/16 inch in 10 feet), and plus or minus 3.18 mm (1/8 inch) over the entire area. Floor assembly to be rigid, free of vibration, rocking panels, rattles and squeaks.

H. Leakage: Air leakage through the joints between panels and around the perimeter of the floor system not to exceed .057 cubic meters (2 cubic feet) of air per minute per linear 305

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09 69 00 - 6 of 25 mm (1 foot) of joint subjected to 125 Pa (0.5 inch, water gauge) positive pressure in the plenum.

I. Grounding: Components to be in direct positive contact for safe continuous electrical grounding of the entire floor system.

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

J. Static Electricity Control: The acceptable resistance range is from not less than 0.5 mega ohms minimum to not more than 20,000 mega ohms maximum. Maximum electrical resistance is to be measured from the top of the panel to the grounded subfloor. Exposed metal will not be allowed at the wearing surface of the floor.

K. Flame Spread Rating: Provide assembly flame spread of 25 or less using ASTM E84 test method.

a. Provide seismic restraint in accordance with the requirements of the drawings, VA Handbook H18-8: Seismic Design

Requirements(https://www.cfm.va.gov/til/etc/seismic.pdf) and this specification in order to maintain the integrity of computer access flooring structural system so that they remain safe and functional in case of seismic event.

2. The design of seismic restraints of computer access flooring to resist seismic load shall be based on Seismic

Design parameters indicated below in accordance with VA H-

18-8 in conjunction with ASCE 7-16 Specific requirements for Critical and Essential facilities are covered in

Section 4.0 of H-18-8, including applying Ip = 1.5 for the computer access flooring.

a. International Building Code 2018 Edition

b. American Society of Civil Engineers Seismic

Evaluation and Retrofit of Existing Buildings ASCE 41-

17.

https://www.cfm.va.gov/til/etc/seismic.pdf

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c. American Society of Civil Engineers Minimum Design

Loads and Associated Criteria for Buildings and Other

Structures ASCE 7-16

d. Facility Occupancy Category per VA H-18-8: Critical

e. Seismic Factors as follows:

1. SS=0.043 MCER ground motion (period=0.2s)

2. S1=0.024 MCER ground motion (period=1.0s)

3. SMS=0.069 Site-modified spectral acceleration value

4. SM1=0.057 Site-modified spectral acceleration value

5. SDS=0.046 Numeric seismic design value at

0.2s

SA

6. SD1=0.038 Numeric seismic design value at

1.0s

SA

7. Seismic Design Category “A”

8. Fa=1.6 Site amplification factor at 0.2s

9. Fv=2.4 Site amplification factor at 1.0s

10. CRS=0.94 Coefficient of risk (0.2s)

11. CR1=0.896 Coefficient of risk (1.0s)

12. PGA=0.02 MCEG peak ground acceleration

13. FPGA=1.6 Site amplification factor at PGA

14. PGAM=0.032 Site modified peak ground acceleration

15. TL=12 Long-period transition period (s)

16. SsRT=0.043 Probabilistic risk-targeted ground motion (0.2s)

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17. SsUH=0.046 Factored uniform-hazard spectral acceleration (2% probability of exceedance in 50 years)

18. SsD=1.5 Factored deterministic acceleration value (0.2s)

19. S1RT=0.024 Probabilistic risk-targeted ground motion (1.0s)

20. S1UH=0.026 Factored uniform-hazard spectral acceleration (2% probability of exceedance in 50 years)

21. S1D=0.6 Factored deterministic acceleration value (1.0s)

22. PGAd=0.5 Factored deterministic acceleration value (PGA)

23. Site Class: D

24. Building Risk Category: III

25. Component Importance Factor(Ip): 1.5

1.6 QUALITY CONTROL:

A. Shop-Drawing Preparation:

1. Computer Access Flooring seismic restraint systems shop drawings and delegated design calculations shall be prepared by a professional structural engineer with a minimum of 5 years’ experience in the design and detailing of seismic force restraints. The professional structural engineer shall be registered by any board static registration in the United

States and submit qualifications with list of projects illustrating compliance with the experience requirement of this section.

B. Coordination:

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1. Do not install seismic restraints until seismic restraint submittals are approved by the Contracting Officers

Representative (COR).

2. Coordinate installation of bracing with new, temporary, and existing equipment.

C. Seismic Certification:

This bracing requires Special Seismic Certification in accordance with requirements of section 13.2.2 of ASCE 7, including those required in existing buildings within Section 13.7.1.3.3,

13.7.7.3.3 and 13.7.8.3.3 of ASCE 41. The computer access floor is not to be considered inherently rugged as listed in Section

4.2.2 of VA H18-8, and shall comply with section 13.2.6 of ASCE

7.

D. Access flooring contractor shall have documented past experience with the replacement of access flooring in a minimum of five (5) live data center.

1.7 Performance Requirements

A. Design Load: Panel supported on actual understructure system shall be capable of supporting a point load of 2500 lbs. applied on a one square inch area at any location on the panel without experiencing permanent set in excess of 0.010 inches as defined by CISCA. The loading method used to determine design (allowable) load shall be in conformance with CISCA Concentrated Load test method but with panel tested on actual understructure instead of steel blocks.

B. Safety Factor: Panel supported on actual understructure system shall withstand a point load of no less than (2) two times its design load rating on a one square foot area anywhere on the panel without failure when tested in accordance with CISCA A/F, Section 2, “Ultimate Loading”. Failure is defined as the point at which the system will no longer accept the load.

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C. Ultimate Load: Panel supported on actual understructure system shall be capable of supporting a point load of at least 5000 lbs.

applied through a load indentor on a one square foot area at any location on the panel without failure (i.e. minimum safety factor if 2) when tested in accordance with CISCA A/F, Section 2, “Ultimate Loading”.

D. Rolling Load: Panel supported on actual understructure system 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 when tested in accordance with CISCA A/F Section 3, “Rolling Loads”. Note:

wheel 1 and wheel 2 tests shall be performed on two separate panels.

E. Impact Load: Panel and supporting understructure (the system) shall be capable of supporting an impact load of 200 lbs. dropped from a height of 36 inches onto a one square foot area (using a round or square indentor) at any location on the panel when tested in accordance with CISCA A/F, Section 8, “Drop Impact Load

Test”.

F. 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.

G. Panel Cutout: Panel with an 8.625” diameter interior cutout supported on actual understructure shall be capable withstanding an ultimate load of 5000 lbs. without failure without the use of additional supports.

H. Flammability: System shall meet Class A Flame spread requirements for flame spread and smoke development. Tests shall be performed

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09 69 00 - 11 of 25 in accordance with ASTM-E84-1998, Standard Test Method for

Surface Burning Characteristics for Building Materials.

I. Combustibility: All components of the access floor system shall qualify as non-combustible by demonstrating compliance with requirements of ASTM E 136, Standard Test Method for Behavior of

Materials in a Vertical Tube Furnace at 750 deg C.

J. Recycled Content: Panel and understructure system shall be required to have a minimum post-consumer recycled content of 15% and a minimum total recycled content of 40%.

K. Axial Load: Pedestal support assembly shall provide a 6000 lb.

axial load without permanent deformation when tested in accordance with CISCA A/F, Section 5, “Pedestal Axial Load Test”.

L. Overturning Moment: Pedestal support assembly shall provide an average overturning moment of 1000 in-lbs. when glued to a clean, sound, uncoated concrete surface when tested in accordance with

CISCA A/F, Section 6,“Pedestal Overturning Moment Test”.

M. Stringer Concentrated Load: Stringer shall be capable of withstanding a concentrated load of 450 lbs. placed in its midspan on a one square inch area using a round or square indentor without exceeding a permanent set of 0.010” after the load is removed when tested in accordance with CISCA A/F, Section

4, “Stringer Load Testing”.

1.7 SUBMITTALS

A. Submit in accordance with Section 01 33 23, SHOP DRAWINGS, PRODUCT DATA, AND SAMPLES.

B. Sustainable Design Submittals, as described below:

1. Volatile organic compounds per volume as specified in

PART 2 – PRODUCTS.

C. Samples: Full sized floor panel and each understructure component.

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D. Shop Drawings:

1. Floor panel layout, including railing, step and ramp location.

2. Detail components of assembly, anchoring methods and edge details, including cut-out details, method of grounding.

E. Manufacturer’s Literature and Data: Access floor.

F. Manufacturer’s Certificates: Flame spread rating.

G. Floor System Test Reports: Submit certified test reports, from a testing laboratory satisfactory to the COR, attesting that the floor system proposed for installation meets all specified requirements. Submit test reports with shop drawings.

H. Manufacturer’s Qualifications.

I. Installer’s Qualifications.

J. Seismic Calculations.

K. Submit a complete and coordinated set of bracing and signed and sealed anchorage drawings and calculations for all computer access flooring elements requiring seismic restraint by the access flooring contractor’s delegated professional structural engineer for review prior to installation including:

1. Description, layout, and location of all items to be anchored or braced with anchorage or brace points noted and dimensioned.

2. Details of all anchorage and bracing at large scale with all members, parts brackets shown, together with all connections, bolts, welds etc. clearly identified and specified. Details shall be coordinated with all project conditions and trades prior to shop drawing submission for review.

3. Complete calculations including but not limited to seismic design criteria, computer model input and output, seismic design forces and capacities, design tables and information used for all proprietary design elements such as post installed anchors, stamped and signed by a professional structural engineer

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4. For all post installed anchorages submit the appropriate

International Code Council Engineering Service (ICC-ES) evaluation reports, California’s Office of Statewide Health

Planning and Development(OSHPD) pre-approvals, or lab test reports verifying compliance with OSHPD Interpretation of

Regulations 28-6.

5. Delegated professional structural engineer qualifications.

6.

L. Submit for review prior to installation, the following for seismic protection

1. Structural framing for the seismic and gravity support and the main superstructure for which the bracing and or anchorage is attached.

2. Location of all gravity loads.

3. Numerical value of gravity load reactions.

4. Location of all seismic bracing.

5. Numerical value of applied seismic brace loads.

7. Type of connection (Vertical support, vertical support with seismic brace etc.).

8. Seismic brace reaction type (tension or compression): Details illustrating all support and bracing components, methods of connections, and specific anchors to be used.

M. Manufacturer’s installation instructions and guidelines.

N. Manufacturer’s Owner Manual outlining recommended care and maintenance procedures.

1.8 QUALITY ASSURANCE

A. Manufacturer’s Qualifications: Manufacturer with three (3) years’ experience in providing items of type specified.

B. Installer’s Qualifications: Installers who are trained and approved by manufacturer and have a minimum of three (3) years’ experience installation of units required for this project.

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C. Obtain all access flooring system components from single manufacturer.

1.9 DELIVERY, STORAGE AND HANDLING

A. Delivery:

1. Deliver materials to site in undamaged condition, in original containers or packages, complete with accessories and instructions. Label packages with manufacturer’s name and brand designations. Package materials covered by specific references bearing specification number, type, and class as applicable.

B. Storage:

C. Area to receive and store access floor materials shall be enclosed and maintained at ambient temperatures between 35° to

95° F and relative humidity levels between 20% to 80%. All floor panels shall be stored at ambient temperature between 50° to 90°

F for at least 24 hours before installation begins. All areas of installation shall be enclosed and maintained at ambient temperature between 50° to 90° F and at relative humidity levels between 20% to 80%, and shall remain within these environmental limits throughout occupancy

D. Handling:

1. Handle and protect materials in a manner to prevent damage during the entire construction period.

1.10 WARRANTY

A. Construction Warranty: Manufacturer’s no dollar limit 5 year materials and labor warranty.

1.11 APPLICABLE PUBLICATIONS

A. The publications listed below form a part of this specification to the extent referenced. The publications are referenced in the text by the basic designation only.

B. American Association of Textile Chemists and Colorists (AATCC):

134-11 ............... Electrostatic Propensity of Carpets

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C. Architectural Aluminum Manufacturers Association (AAMA):

2604-10 .............. High Performance Organic Coatings on

Aluminum Extrusions and Panels.

D. ASTM International (ASTM):

E84-20 ............... Surface Burning Characteristics of Building

Materials

E648-19ae1 ........... Critical Radiant Flux of Floor-Covering

Systems Using a Radiant Heat Energy Source

F150-06(2018) ........ Electrical Resistance of Conductive and

Static Resilient Flooring

F1066-04(2018) ....... Vinyl Composition Floor Tile

F1700-20 ............. Solid Vinyl Floor Tile

E. Code of Federal Regulation (CFR):

40 CFR 59 ............ Determination of Volatile Matter Content, Water Content, Density Volume Solids, and

Weight Solids of Surface Coating

F. National Association of Architectural Metal Manufacturers

(NAAMM):

AMP 500 Series ....... Metal Finishes Manual

G. National Electrical Manufacturers Association (NEMA):

LD-3.1-05 ............ Application, Fabrication, and Installation of High-Pressure Decorative Laminates

H. Ceilings and Interior Systems Construction Association (CISCA):

CISCA 2004 ........... Recommended Test Procedures for Access

Floors

I. National Fire Protection Association (NFPA):

75-13 ................ Fire Protection of Information Technology

Equipment

J. Underwriters Laboratory (UL):

94-06(R2014) ......... Tests for Flammability of Plastic Materials for Parts in Devices and Appliances

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1.12 CUT-OUTS

A. Fabricate cut-outs in floor panels to accommodate cable penetrations and service outlets where shown on construction documents or specified. Provide reinforcement or additional support to make panels with cut-outs perform the same as solid uncut panels. Fit cut-outs with manufacturer’s standard grommet.

For cut-outs larger than maximum size grommet, trim edge of cut-outs with plastic trim, molding and/or gaskets having tapered top flange. Provide removable twist close covers for grommets.

1. 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.

B. Prior to installation, subfloor is to be dry and free of any surface irregularities that will adversely affect access flooring system appearance or performance.

C. Clear the area in which the floor system is to be installed of debris. Clean floor surfaces and remove dust before the work is started.

1.13 INSTALLATION

A. Layout floor panel installation to keep the number of cut panels at the floor perimeter to a minimum and to sizes not less than

1/2 half width to the greatest extent possible. Scribe panel assemblies at perimeter and around column to provide a close fit with no voids greater than 6 mm (1/4 inch) where panels abut vertical surface.

B. Secure bases of pedestals to the structural sub-base with mechanical fasteners in full and firm contact with the subbase.

Set pedestals plumb, and in true alignment.

C. Where pedestal stringer system is used, join the stringers and other framing members with threaded fasteners for positive connection to the pedestals to preclude lateral movement.

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Uniformly space stringers in parallel lines, and place at the indicated elevation.

D. Provide auxiliary framing around columns and other permanent construction, at sides of ramps, at free ends of floor, and beneath floor panels that are substantially cut to accommodate utility systems.

E. Construct floor panels to lie flat without warp or twist and bear uniformly on supports without rocking, and without edges projecting above the floor plane. Panels to interlock with supports in a manner that will preclude lateral movement.

F. Provide free ends of floor with positive anchorage and rigid support where floor system does not abut wall or other construction.

G. Cover exposed ends of floor system with aluminum closures.

Closures to consist of complete trim and fascia assemblies.

1.14 REPAIR OF WELDED GALVANIZED SURFACES:

A. Use galvanized repair compound where galvanized surfaces are scheduled to receive field or shop coatings, and apply in accordance with manufacturers printed instructions.

1.15 CLEANING

A. Remove debris accumulated during installation from beneath the raised floor system. Immediately after completion of the floor installation, apply floor cleaner in accordance with the floor covering manufacturer's instruction. Do not allow any cleaner to remain between individual panels.

1.16 PROTECTION

A. Cover cleaned floors with clean building paper before construction traffic is permitted. Remove protective covering at completion of Work.

PART 2 - PRODUCTS

2.1 Manufacturers- Basis of Design

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A. Access floor system shall be as manufactured by Tate Access

Floors, Inc. and shall consist of ConCore 2500/3000 access floor panel supported by a 2” bolted stringer understructure system.

B. Or approved equal. Alternative products shall meet or exceed all requirements as indicated herein and must receive prior written approval by the COR.

C. Access floor manufacture shall be ISO9001: 2015 certified demonstrating it has a robust and well documented quality management system with continuous improvement goals and strategies.

D. Access floor manufacturer’s facilities shall be ISO14001:2015 certified demonstrating that they maintain an environmental management system.

E. Access floor manufacturer’s facilities shall be OHSAS 18001:2018 certified demonstrating that they maintain an

Occupational Health and Safety Management system.

2.2 Support Components

Pedestals:

A. 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.

B. 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.

C. Steel pedestal head shall be solid filet welded to a threaded rod which includes a specially designed adjusting nut. The nut shall provide location lugs to engage the pedestal base

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09 69 00 - 19 of 25 assembly, such that deliberate action is required to change the height setting.

D. 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.

E. Pedestal base assembly shall consist of a formed steel plate with no less than 36 square inches of bearing area, solid filet welded to a 1-1/4” round steel tube and shall be designed to engage the head assembly.

2.3 Stringers:

A. Stringers shall be 2” heavy duty.

B. Stringers shall support each edge of panel.

C. Steel stringers shall have conductive galvannealed coating.

Zinc electroplating shall be prohibited on stringers and stringer fasteners.

D. 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.

E. Stringer grid shall be 4 ft stringers in a basketweave configuration ensuring maximum lateral stability in all directions.

2.4 Panel Components

Floor Panels:

A. Panels shall consist of a top steel sheet welded to a formed steel bottom pan filled internally with a lightweight

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09 69 00 - 20 of 25 cementitious material. Mechanical or adhesive methods for attachment of the steel top and bottom sheets are unacceptable.

B. Floor panels shall be protected from corrosion by electro-deposited epoxy paint. The use of zinc electroplating shall be prohibited.

C. Cementitious fill material shall be totally encased within the steel welded shell except where cut for special conditions.

Note: This greatly reduces the potential for dust in the environment from exposed cement materials.

D. Panels shall have integral trim.

2.5 Accessories

A. Provide manufacturer’s standard steps, ramps, fascia plate, perimeter support, and grommets for a complete system.

B. Provide 15 spare floor panels type used in the project for maintenance stock. Deliver to project in manufacturer’s standard packaging clearly marked with the contents.

C. Provide 4 spare perforated floor panel type used in the project for maintenance stock. Deliver to project in manufacturer’s standard packaging clearly marked with the contents.

D. Provide two panel lifting devices.

E. When applicable provide manufacturer’s standard underfloor air systems components (including, grilles, diffusers and perforated floor panels) where indicated on the contract drawings.

2.6 FINISHES

A. Where floor coverings are by the access floor manufacturer, the type, color and pattern shall be selected from manufacturer’s standard. All areas to be furnished with laminated floor panels must be maintained at ambient temperature between 50° to 90° F and at humidity level between 20% to 80% relative and shall remain within these ranges through installation and occupancy.

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B. High-pressure laminate floor covering shall meet requirements of NEMA LD3, and shall conform with the following grade: Grade HDM

(1/16”).

C. High-pressure laminate floor coverings shall have an edge condition that is integral to the tile. Separate edge trim pieces are not acceptable.

D. Surface to Ground Resistance of Standard High Pressure Laminate Anti-Static Covering: Average test values shall be within the range of 1,000,000 ohms (1.0 x 106) to 20,000 megaohms (2.0 x 1010 ohms), as determined by testing in accordance with the test method for conductive flooring specified in Chapter 3 of NFPA 99, but modified to place one electrode on the floor surface and to attach one electrode to the understructure. Resistance shall be tested at 500 volts.

2.7 Fabrication Tolerances

A. Floor panel flatness measured on a diagonal: +/- 0.035”

B. Floor panel flatness measured along edges: +/- 0.025”

A. Floor panel width or length of required size: +/- 0.010”

B. Floor panel squareness tolerance: +/- 0.015”

PART 3 – EXECUTION

3.1 Preparation

A. Examine existing structural concrete 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.

B. Verify that proposed adhesive achieves bond to existing slab before commencing work if the adhesive does not active bond grind off existing sealer.

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C. Verify dimensions on contract drawings, including level of interfaces including abutting floor, ledges and doorsills.

D. Area to receive and store access floor materials shall be enclosed and maintained at ambient temperatures between 35° to

95° F and relative humidity levels between 20 to 80%. At least

24 hrs. before installation begins, all floor panels shall be stored at ambient temperatures between 50° to 90° F and relative humidity levels between 20% to 80% and shall remain within these environmental limits throughout occupancy.

3.2 Installation

A. Pedestal locations shall be established from approved shop drawings so that mechanical and electrical and fire suppression work can be installed without interfering with pedestal installation.

B. Installation of access floor shall be coordinated with other trades to maintain the integrity of the installed system, and to maintain the data center in full operation 24 hours per day, 7 days per week, 365 days per year. There shall be no shut down of any data systems. All traffic on access floor shall be controlled by access floor installer. No traffic but that of access floor installers shall be permitted on any finished floor area for 24 hours to allow the pedestal adhesive to set. Access floor panels shall not be removed by other trades for 72 hours after their installation.

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.

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E. Access floor installer shall keep the subfloor broom clean and dust free as installation progresses.

F. Partially complete floors shall be braced against shifting to maintain the integrity of the installed system at all times.

G. Additional pedestals as needed shall support panels where floor is disrupted by columns, walls, and cutouts.

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 feet or 0.125” overall.

J. Inspect system prior to application of floor covering and replace any floor panels that are cracked, broken and structurally damaged and do not comply with specified requirements.

3.3 SEISMIC ANCHORING REQUIREMENTS

A. Provide equipment supports and anchoring devices to withstand the seismic design forces, so that when seismic design forces are applied, the equipment cannot displace, overturn, or become inoperable.

B. Provide anchorages in conformance with recommendations of the equipment manufacturer and as shown on approved shop drawings and calculations.

C. Construct seismic restraints and anchorage to allow for thermal expansion.

D. Testing Before Final Inspection:

1. Test 10-percent of anchors in masonry and concrete per ASTM

E488, and ACI 355.2 to determine that they meet the required load capacity. If any anchor fails to meet the required load, test the next 20 consecutive anchors, which are required to

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2. Before scheduling Final Inspection, submit a report on this testing indicating the number and location of testing, and what anchor-loads were obtained.

3. Construct seismic restraints and anchorages to not interfere with other trades or damage existing or in-situ elements of the constructed building.

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