Access Flooring ME- Building Group
SECTION 10270 - ACCESS FLOORING
PART 1GENERAL
1.1RELATED DOCUMENTS
A.Drawings and general provisions of the Contract, including General and Supplementary Conditions and Division1 Specification Sections, apply to this Section.
1.2SUMMARY
A.This Section includes the following:
1.Access flooring panels and understructure.
2.Floor panel coverings.
3.Various mechanical, electrical, data and communication accessories.
B.Related Sections include the following:
1.Concrete sealer shall be compatible with pedestal adhesive, see Division 3.
2.Division16 Section "Grounding and Bonding" for connection to ground of access flooring understructure.
C.Quantity Allowances: Provide the following as specified in Division1 Section "Allowances":
1.Cutouts in floor panels.
1.3UNIT PRICES
A.Unit Prices: The Contract Sum will be adjusted for changes in quantity from that indicated in allowances for cutouts in floor panels based on amounts stipulated in the Form of Agreement and complying with Division1 Section "Unit Prices." Changes to quantities and to the Contract Sum will be made by Change Order.
1.4DEFINITION
A.ESD: Electrostatic discharge. The transfer of electric charge between bodies at different potentials.
1.5SYSTEM DESCRIPTION
A.Access Flooring System: Assemblies composed of modular floor panels on pedestals with or without stringers.
1.6PERFORMANCE REQUIREMENTS
A.Structural Performance: 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 CISCAA/F, "Recommended Test Procedures for Access Floors" :
1.Concentrated Loads: Provide floor panels, including those with cutouts, capable of withstanding a concentrated design load of 1500 lbf, with a bottom-surface deflection under load and a permanent set not to exceed, respectively, 0.10 and 0.010 inch (2.54 and 0.25 mm), measured below each applied-load location at horizontal surface of nearest composite beam according to CISCAA/F, SectionI, "Concentrated Loads."
2.Rolling Loads: Provide access flooring systems capable of withstanding rolling loads of the following magnitude, with a combination of local and overall deformation not to exceed 0.040 inch (1.02 mm) after exposure to rolling load over CISCAA/F PathA or B, whichever path produces the greatest top-surface deformation, according to CISCAA/F, SectionIII, "Rolling Loads." Note: wheel 1 and wheel 2 tests shall be performed on two separate panels.
a.Wheel 1:Size: 3” dia x 1 13/16” wideLoad: 1250 lbs.Passes:10
b.Wheel 2*:Size:
1)(A) 6” dia x 2” wideLoad: 1000 lbs. Passes:10,000.
2)(B) 10” dia. X 4” wide.
3)Note: For loads up to 1500 lbs., specify Wheel 2 (A). For loads greater than 1500 lbs., specify wheel 2 (B).
3.Stringer Load Testing: Provide stringers, without panels in place, capable of withstanding a concentrated load of 450 lbf (2002N) at center of span with a permanent set not to exceed 0.010 inch (0.25 mm), as determined per CISCAA/F, SectionIV, "Stringer Load Testing."
4.Pedestal Axial Load Test: Provide pedestal assemblies, without panels or other supports in place, capable of withstanding a 5000 lbf (22240N) axial load per pedestal, according to CISCAA/F, SectionV, "Pedestal Axial Load Test."
5.Pedestal Overturning Moment Test: Provide pedestal assemblies, without panels or other supports in place, capable of withstanding an overturning moment per pedestal of 1000 lbf x inches (113N x meters), according to CISCAA/F, SectionVI, "Pedestal Overturning Moment Test."
B.Floor Panel Impact-Load Performance: Provide access flooring system capable of withstanding an impact load of 150 lb (68.0 kg) when dropped from 36 inches (914 mm) onto a 1-sq. in. (6.5-sq.cm) area located anywhere on panel, without failing. Failure is defined as collapse of access flooring system.
C.Seismic Performance: Provide access flooring system capable of withstanding the effects of seismic motions determined according to ASCE7, "Minimum Design Loads for Buildings and Other Structures" Section9, "Earthquake Loads."
D.ESD-Control Properties: Provide floor coverings with ESD-control properties indicated as determined by testing identical products per test method indicated by an independent testing and inspecting agency.
1.Static-Dissipative Floor Covering Properties:
a.Electrical Resistance: Test per ASTMF150 with 100-V applied voltage.
1)Average greater than 1 megohm and less than or equal to 1000 megohms when test specimens are tested surface to ground.
2)Average no less than 1 megohm and less than or equal to 1000 megohms when installed floor coverings are tested surface to ground.
b.Static Generation: Less than 300 V when tested per AATCC-134 at 20 percent relative humidity with conductive footwear.
c.Static Decay: 5000 to 0V in less than 0.25 seconds when tested per FED-STD-101C/4046.1.
2.Panel-to-Understructure Resistance: Not more than 10 ohms as measured without floor coverings.
1.7SUBMITTALS
A.Product Data: For product indicated.
B.Shop Drawings: Include layout of access flooring system and relationship to adjoining Work based on field-verified dimensions.
1.Details and sections with descriptive notes indicating materials, finishes, fasteners, typical and special edge conditions, accessories, and understructure.
2.For installed products indicated to comply with design loads, include structural analysis data signed and sealed by the qualified professional engineer responsible for their preparation.
C.Samples for Initial Selection: For flooring material and exposed finish indicated.
D.Product Certificates: For access flooring system, signed by product manufacturer.
E.Qualification Data: For Installer.
F.Product Test Reports: Based on evaluation of comprehensive tests performed by a qualified testing agency, or performed by access flooring manufacturer and witnessed by a qualified testing agency, for flooring material and exposed finish.
1.8QUALITY ASSURANCE
A.Installer Qualifications: An employer of workers trained and approved by manufacturer.
B.Source Limitations: Obtain access flooring system through one source from a single manufacturer.
C.Regulatory Requirements: Fabricate and install access flooring to comply with NFPA75 requirements for raised flooring.
D.Provide floor panels that are clearly and permanently marked on their underside with panel type and concentrated-load rating.
1.Mockups: Build mockups to verify selections made under sample submittals and to demonstrate aesthetic effects and set quality standards for materials and execution.
a.Build mockup of typical access flooring assembly as shown on Drawing. Size to be an area no less than five floor panels in length by five floor panels in width.
b.Approved mockups may become part of the completed Work if undisturbed at time of Substantial Completion.
E.Preinstallation Conference: Conduct conference at Project site to comply with requirements in Division1 Section "Project Management and Coordination."
1.Review connection with mechanical and electrical systems.
2.Review and finalize construction schedule and verify availability of materials, Installer's personnel, equipment, and facilities needed to make progress and avoid delays.
1.9PROJECT CONDITIONS
A.Environmental Limitations: Do not install access flooring until spaces are enclosed, subfloor has been sealed, ambient temperature is between 40 and 90 degF (4 and 32 degC), and relative humidity is not more than 70 percent.
1.10COORDINATION
A.Coordinate location of mechanical and electrical work in underfloor cavity to prevent interference with access flooring pedestals.
B.Mark pedestal locations on subfloor by use of a grid,with a module equal to width of five floor panels in both directions, to enable mechanical and electrical work to proceed without interfering with access flooring pedestals.
C.Proceed with installation only after completion of other construction within affected spaces.
1.11EXTRA MATERIALS
A.Furnish extra materials described in subparagraphs below that match products installed and that are packaged with protective coverings for storage and identified with labels describing contents.
1.Flooring Panels: 2%.
2.Pedestals: 2%.
3.Stringers: 2%.
PART 2PRODUCTS
2.1ACCESS FLOORING SYSTEM
A.Floor Panels And Understructure
1.Basis-of-Design Product: Subject to compliance with requirements, provide Tate “ConCore: CC1500 Panel-24”or comparable product by one of following:
a.All Steel-welded construction filled internally with cementitious core material panel systems:
1)Access Floor Corporation.
2)ASM Modular Floors Inc.
3)Camino Modular Systems
4)Computer Environments, Inc.
2.Floor Panels, General: Provide modular 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:
a.Fabrication Tolerances: Fabricate panels to the following tolerances with squareness tolerances expressed as the difference between diagonal measurements from corner to corner:
1)Size and Squareness: Plus or minus 0.015 inch (0.38 mm) of required size, with a squareness tolerance of plus or minus 0.015 inch (0.38 mm), unless tolerances are otherwise indicated for a specific panel type.
2)Flatness: Plus or minus 0.020 inch (0.50 mm), measured on a diagonal on top of panel.
b.Panel Attachment to Understructure: By gravity.
3.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.
4.Floor panels shall be protected from corrosion by electro-deposited epoxy paint. The use of zinc electroplating shall be prohibited.
5.Cementitious fill material shall be totally encased within the steel welded shell except where cut for special conditions.
6.Perforated Airflow Panels (Provide 22 full panels): Perforated steel airflow panels designed for static loads of 1000 lbs. shall be interchangeable with standard field panels and shall have 25% open surface area with the following air distribution capability:
a.Panel without damper: 784 cfm at 0.1-inch of H2O (static pressure).
b.Panel with damper at 100% open position: 652 cfm at 0.1-inch of H2O (static pressure).
7.Pedestals: Assembly consisting of base, column with provisions for height adjustment, and head (cap); made of steel.
a.Base: Square or circular base with not less than 16 sq. in. (103 sq.cm) of bearing area.
b.Column: Of height required to bring finished floor to elevations indicated. Weld to base plate.
c.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 vibratory displacement is prevented.
d.Head: Designed to support understructure system indicated.
1)Provide sound-deadening pads or gaskets at contact points between heads and panels.
8.Stringer Systems: Modular steelstringer 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.
a.Bolted Stringers: System of main and cross stringers connected to pedestals with threaded fasteners accessible from above.Bolts shall provide positive electrical contact between the stringers and pedestals. Connections depending on gravity or spring action are unacceptable.
b.Provide continuous gasket at contact surfaces between panel and stringers to deaden sound, to seal off underfloor cavity from above, and to maintain panel alignment and position.
c.Provide stringers that support each edge of each panel where required to meet design-load criteria.
B.Floor Panel Coverings
1.General: Provide factory-applied floor coverings of type indicated that are laminated by access flooring manufacturer to tops of floor panels.
2.Colors, Textures, and Patterns: As selected by Architect from manufacturer's full range.
3.Static-Dissapative High Pressure Plastic Laminate: NEMALD3, High-Wear type, GradeCHWH 1/16”, fabricated in one piece to cover each panel face within perimeter plastic edging or with integral trim serving as edging.
4.Surface to Ground Resistance of Conductive Laminate Covering: Not less than 25,000 ohms (2.5 x 104), nor more than 1,000,000 ohms (1.0 x 106), 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.
5.Edging: Manufacturer's standard integral edge trim. Provide size and profile of applied edge trim that fits floor coverings selected.
2.2Accessories
A.UL listed power, voice & data serviceoutlet boxes shall be provided in locations as detailed on Drawings. High capacity 11 ¼ inch square PVD service outlet boxes shall be capable of accommodating four duplex receptacles, three knockouts for standard voice/data faceplates or grommeted interface plates. Standard capacity 7-5/16 by 6-15/16 inch PVD service outlet boxes shall be capable of accommodating two duplex receptacles or grommeted interface plates. Service outlet box shall be drop-in design having hinged Lexan lid and Lexan frame with tapered edge. Service outlet box shall be capable of withstanding without failure load of 800 lb.
1.Adhesives: Manufacturer's standard adhesive for bonding pedestal bases to subfloor. Provide adhesive which meets LEED VOC requirements.
2.Post-Installed Anchors: For anchoring pedestal bases to subfloor, provide 4 post-installed threaded concrete screws made from carbon-steel components, zinc plated to comply with ASTMB633, ClassFe/Zn 5 (5 microns) for ClassSC1 service condition (mild), with the capability to sustain, without failure, load equal to 1.5 times the loads imposed by pedestal overturning moment on fasteners, as determined by testing per ASTME488, conducted by qualified independent testing agency.
3.Cutouts: Provide cutouts in floor panels for cable penetrations and service outlets. Provide reinforcement or additional support, if needed, to make panels with cutouts comply with standard performance requirements.
a.Number, Size, Shape, and Location: As specified in Division1 Sections "Allowances" and "Unit Prices."
b.Fit cutouts with manufacturer's standard grommets in sizes indicated or, if size of cutouts exceeds maximum grommet size available, trim edge of cutouts with manufacturer's standard plastic molding having tapered top flange. Furnish removable covers for grommets.
4.Panel Lifting Device: Manufacturer's standard portable lifting device of type required for specified panels. Provide one lifting devices per room.
5.Perimeter Support: Where required, 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.
6.When applicable provide manufacturer’s standard underfloor air systems components (including, grilles, diffusers and perforated floor panels) where indicated on the contract drawings or as indicated on Shop Drawings by Architect.
PART 3EXECUTION
3.1EXAMINATION
A.Examine substrates, with Installer and manufacturer's representative present, for compliance with requirements for installation tolerances and other conditions affecting performance of 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 adhesive or post-installed anchor attachment of pedestals.
2.Proceed with installation only after unsatisfactory conditions have been corrected.
3.2PREPARATION
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 clean subfloor to remove dust, dirt, and construction debris before beginning installation.
3.3INSTALLATION
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.Attach pedestals to subfloor by post-installed mechanical anchors.
C.Adjust pedestals to permit top of installed panels to be set flat, level, and to proper height.
D.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.
F.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 encapsulated, composite-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 access flooring already installed.
H.Ground flooring system as recommended by manufacturer and as needed to comply with performance requirements for electrical resistance of floor coverings.
I. Clean dust, dirt, and construction debris caused by floor installation, and vacuum subfloor area, as installation of floor panels proceeds.
J.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.
K.Prohibit traffic on access flooring for 24 hours and removal of floor panels for 72 hours after installation to allow pedestal adhesive to set.
L.After completing installation, vacuum clean access flooring and cover with continuous sheets of reinforced paper or plastic. Maintain protective covering until time of Substantial Completion.
M.Replace access flooring panels that are stained, scratched, or otherwise damaged or that do not comply with specified requirements.
END OF SECTION 10270
BP/DWH
Page 1 of 9
Revision Date: Oct. 2010 Project & Bid Package
File name:10270AccessFlooring.doc