T-Mobile, USA – Houston MSO Expansion Project

BCEI #C1103





A. Drawings and general provisions contract, including general and supplementary conditions and

Division 1 Specifications Section, apply to this section.


A. Access flooring is a complete portable assembly of modular floor panels on an elevated support system (understructure), forming an accessible underfloor cavity to accommodate electrical and mechanical services.


A. Design Load: Panel supported on actual understructure (the system) shall be capable of supporting a safe working load or design load of 1250 lbs. This rating signifies that the system will withstand not only a concentrated load placed on a one square inch area at any location on the panel without yielding but also demonstrates the ability to withstand an overload capacity of two times its rating (ie. a safety factor of 2).

B. Safety Factor: Panel supported on actual understructure (the system) shall be capable of withstanding a minimum of (2) two times the design load anywhere on the panel without failure.

Failure is defined as the point at which the system will no longer accept the load.

C. Uniform Load: Panel supported on actual understructure (the system) shall be capable of supporting a uniform load of 300 lbs./ft


placed on the entire area of the panel without yielding and generating a permanent set of no more than 0.010” once the load is removed. Note: The uniform load rating of an access floor panel as specified herein should not be confused with the “uniform live load” as specified in seismic zone applications.

D. Rolling Load: Panel supported on actual understructure (the 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. 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: 1,000 lbs. Passes: 10

Wheel 2: Size: 6” dia x 2” wide Load: 800 lbs. Passes: 10,000

E. Impact Load: Panel and supporting understructure (the system) shall be capable of supporting an impact load of 150 lbs. dropped from a height of 36 inches onto a one square inch area (using a round or square indentor) at any location on the panel.

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T-Mobile, USA – Houston MSO Expansion Project

BCEI #C1103



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. Access flooring shall comply with NFPA 75 requirements for access flooring.

H. Panel Cutout: Panel with an 8” diameter interior cutout supported on actual understructure shall be capable of maintaining its design load strength anywhere on the panel without the use of additional supports.

I. Flammability: System shall meet Class A Flame spread requirements for flame spread and smoke development. Tests shall be performed in accordance with ASTM-E84-1998, Standard Test

Method for Surface Burning Characteristics for Building Materials.

J. 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.

K. Axial Load: Pedestal support assembly shall provide a 5000 lb. axial load without permanent deformation.

L. Overturning Moment: Pedestal support assembly shall provide an average overturning moment of 1000 in-lbs. when glued to a clean, sound, un-coated concrete surface. ICBO number for the specific system or structural calculations shall be required attesting to the lateral stability of the system under seismic conditions.

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.

A. Access floor system, where indicated on the design documents, 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 and in this specification section.


A. General: Submit the following in accordance with Conditions of Contract and Division 1 Specifications section.

B. Product data for each type of access flooring specified.

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T-Mobile, USA – Houston MSO Expansion Project

BCEI #C1103



C. Shop drawings indicating complete layout of access flooring based of field verified dimensions; include dimensional relationships to adjoining work 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.

D. Samples for initial selection purposes in form of manufacturers color charts consisting of actual units or sections of units showing full range of colors, textures, and patterns available for each type of floor covering and exposed finish indicated.

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

A. Installer qualifications: Engage an experienced installer who is approved by the access flooring manufacturer for installation of the types of access flooring required for this project.

B. Single Source Responsibility: Obtain access flooring from a single manufacturer.

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


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.

A. Environmental conditions: Do not proceed with installation of access flooring until installation area is enclosed and has an ambient temperature of between 55 degrees Fahrenheit and 80 degrees Fahrenheit and a relative humidity of not more than 60 percent.


A. Mark pedestal locations by use of a 4’x 4’ grid on concrete subfloor so that mechanical and electrical work can take place without interfering with pedestals.

B. Do not proceed with installation of access flooring until after substantial completion of other performable construction within affected spaces.

A. Deliver extra materials to owner. Furnish 2% extra materials described below matching products installed, packaged with protective covering for storage and identified with labels clearly describing contents.

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T-Mobile, USA – Houston MSO Expansion Project

BCEI #C1103



1. Standard field panels and understructure. Entire raised floor area to be covered with solid panels at time of installation. Extra stock will be taken when GrateAire perf panels are installed.



A. Subject to compliance with requirements, provide access flooring by the following:

1. TATE Access Floors, Inc. ConCore® 1250


1. Pedestal assemblies shall be corrosive resistant, all steel welded construction, and shall provide an adjustment range of +/- 1” for finished floor heights 12” or greater. Zinc electroplating shall be prohibited on all pedestal components, including head plate, threaded rod, adjustment nut, pedestal tube, base plate, and all fasteners.

2. 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.

3. Hot dip galvanized steel pedestal head shall be 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.

4. 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). Note: This prevents the assembly from inadvertently losing its leveling adjustment when panels are removed from the installation during use.

5. Hot dip galvanized pedestal base assembly shall consist of a formed steel plate with no less than 16 inches of bearing area, welded to a 7/8” square steel tube and shall be designed to engage the head assembly.

6. Finished Floor Height (FFE): 24


1. Stringers shall support each edge of panel.

2. Steel stringer shall have conductive galvannealed coating. Zinc electroplating shall be prohibited on stringers and stringer fasteners.

3. 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.

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T-Mobile, USA – Houston MSO Expansion Project

BCEI #C1103



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

A. Panels shall consist of a top steel sheet welded to a formed steel bottom pan filled internally with a lightweight cementitious material. Mechanical or adhesive methods for attachment of the steel top and bottom sheets are unacceptable. Nominal Panel Size: 24”x 24”

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. Floor panels shall have a corner lock option for: 50% of floor area.

E. Perforated Airflow Panels: Perforated steel airflow panels designed for static loads of 1000 lbs. shall be interchangeable with standard field panels and shall have 56% open surface area with an air distribution capability of 2000 cfm (min.) at .1” of H


O (static pressure). Provide 24” x 24” x

1/8” thick masonite covers taped to top of perforated tiles to protect from dust exposure during construction process.

1. Provide the following quantity of perforated airflow panels (GrateAire – 24) with dampers and finish to be white epoxy: 66

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

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

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

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

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


A. General: Cover tops of floor panels to comply with requirements indicated for color, pattern, and material. All surface coverings to be factory applied by the manufacturer of the access floor panels.

B. Colors and Patterns: Provide floor covering materials in colors and patterns as indicated below:

1. Provide selections made by Architect from manufacturers full range of standard colors and patterns.

C. Plastic Laminate: High-pressure anti-static type w/ integral trim, fabricated in one piece to cover each panel face, Laminate to be 1/16” thick.

D. Edge Condition:

1. Trim not to dislodge, discolor or wear off for a period of 5 years.

2. Panel finish is bare; panel surface covering edge treatment is not applicable.

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T-Mobile, USA – Houston MSO Expansion Project

BCEI #C1103




A. Cutouts: Fabricate cutouts in floor panels to accommodate 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. Installing contractor shall be responsible for cutting out around each of the Computer Room

Air Conditioning (CRAC) units as shown on the contract drawings.

2. Installing contractor shall be responsible for (2) 12” x 12” floor cutouts at each Remote Power

Panel (RPP) location as shown on the contract drawings. Cutouts to be trimmed out with manufacturers’ standard molded edge trim.

3. Installing contractor shall be responsible for cutting (6” x 8” opening) and installing 24

Koldlok Grommets in floor tiles.

B. Panel Lifting Device: Manufacturer’s standard portable lifting device w/ wall-mount hanging bracket of type required for lifting panels with floor covering provided.

1. Provide two at each exit for the raised floor area.

C. Vertical Closures (Fasciae): Manufacturer’s standard metal-closure plates with factory-applied finish.

D. Ramps: Manufacturer’s standard ramp construction of width and slope indicated, but not steeper than 1:12, with raised-disc rubber or vinyl floor covering.

E. Steps: Provide steps of size and arrangement indicated with floor covering to match access flooring. Apply nonslip aluminum nosings to treads, unless otherwise indicated.

F. Railings: Standard extruded-aluminum railings, at ramps and open-sided perimeter of access flooring. Include handrail, intermediate rails, posts, brackets, end caps, wall returns, wall and floor flanges, plates, and anchorages.


Perimeter Support: Manufacturer’s standard method for supporting panel edge and forming transition between access flooring and adjoining floor covering.



A. 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.

B. Concrete sealers, if used, shall be identified and proven to be compatible with pedestal adhesive.

Verify that adhesive achieves bond to slab before commencing work.

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

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T-Mobile, USA – Houston MSO Expansion Project

BCEI #C1103



D. The General Contractor shall provide clear access, dry subfloor area free of construction debris and other trades throughout installation of access floor system. However, this does not mean the entire space will be completely free of systems and contractors for the duration of the installation.

The work will be coordinated, but may have fire suppression system and mechanical system piping roughed-in before / during this process.

E. 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


 F and relative humidity levels between 20% to 80% and shall remain within these environmental limits throughout occupancy.

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

G. Access floor to be continuous. This includes spaces between wall and large floor mounted equipment located near the perimeter (i.e. Computer Room HVAC units).

H. Installation of access floor shall be coordinated with other trades to maintain the integrity of the installed system. 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 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.

I. Floor system and accessories shall be installed under the supervision of the manufacturer’s authorized representative and according to manufacturer’s recommendations.

J. 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.

K. Access floor installer shall keep the subfloor broom clean as installation progresses.

L. Partially complete floors shall be braced against shifting to maintain the integrity of the installed system where required.

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

N. Understructure shall be aligned such that all uncut panels are interchangeable and fit snugly but do not bind when placed in alternate positions.

O. Finished floor shall be level, not varying more than 1/16” in 10 feet or 1/8” overall.

P. Acceptance: General contractor shall accept floor in whole or in part prior to allowing use by other trades.


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