Metric Specifications

Woodcore Specifications 


Part I - General


  1. Elevated floor system shall be 610 X 610 millimeter structural panels on a rigid structural grid supported by adjustable pedestals. Stringer system shall be a grid network of 610 millimeter running in one direction with 610 millimeter cross stringers running perpendicular to main stringers. Elevated floor system shall provide an underfloor space for accommodating electrical wiring, mechanical service lines, and to serve as an air plenum.
    1. Removable, conductive pads shall be used between panels and understructure to provide additional plenum seal.
    2. System shall have electrical resistance of one ohm or less from top metal surface to bottom of panel and 10 ohms or less from panel to pedestal.
    3. System (less floor panel covering) shall have a Class 1-A fire rating when tested according to ASTM-E-84 or NFPA 255.
  2. The access floor system shall be a steel encapsulated woodcore system.


  1. Shop Drawings:
    1. Submit drawings to show access flooring system with floor panel layout and location of handrails, steps, ramps, etc.
  2. Samples:
    1. Submit respective samples and understructure components to be used in system.
  3. Certification:
    1. Submit certificates, independent test reports and data to substantiate compliance with specifications state herein.
PART II-Products


  1. Floor Panels:
    1. Loading
      1. Elevated floor panels shall be capable of supporting a uniform live load of a minimum 11.970 kilopascal with a deflection not to exceed 1.0 millimeter. Floor shall also be capable of supporting a minimum 4500 Newton load concentrated on 645 square millimeter at any point on the panel area without deflecting more than 2.0 millimeter with a safety factor of not less than 3 based on yield strength of the material being used. Floor system shall be laterally stable in all directions whether panels are in place or not. Finished assembly shall be rigid and free of vibration and rocking panels.
      2. Floor panels shall be fabricated from plywood conforming to NIST PS 1 or particle board conforming to ANSI A208.1, structurally bonded to 0.70 millimeter zinc-coated sheet steel on both top and bottom. Plywood or particle board shall be 25 millimeter thick and shall extend to the nominal panel dimension allowing a maximum void at panel edge of 3.2 millimeter.
    2. Fire Safety:Top surface of floor panels shall not exceed 65.6 degrees C within 20 minutes when exposed to an open fire of 871.1 degrees C beneath the panel.
  2. Pedestals
    1. Each pedestal with components as assembled for the specified heights shall be capable of carrying a 22241 Newton axial load without permanent deformation.
    2. Electrical resistance between an individual stringer and pedestal shall be less than 100 microhms. Range of electrical resistance of the floor covering to ground shall be 0.5 to 20,000 megaohms for humidity from 40 to 60 percent relative humidity.
    3. Pedestal shall be constructed to prevent axial rotation of head and loss of height adjustment due to vibration or accidental lifting of pedestal head when panels and any attached stringers are removed.
    4. Pedestals assemblies shall be of all steel construction and galvanized.
    5. Pedestals shall support floor panels to specified finished floor height.
    6. Pedestals shall consist of a square steel base at least 100 by 100 millimeter that is designed to be attached to the subfloor with the manufacturer's recommended adhesive.
    7. Note: Select Type of Pedestal Head From the Following:


      1. Stringerless System Pedestal head shall be 12-gauge steel and retain panels to prevent movement. A sound-deadening, conductive vinyl pad shall be used on each pedestal head.
      2. Snap-On System Pedestal head shall be 12-gauge steel with stringers snapped on and removed hand with no tools required.
      3. Bolt-On System Pedestal head shall be 12-gauge galvanized steel with 4 (four) holes to accept .6 cm diameter machine screws to fasten stringers in position.
      4. Corner-Lock System Pedestal head shall be 12-gauge galvanized steel with 4 (four) holes to accept .6 cm diameter machine screws to fasten panels in position.
      5. Adhesive for anchoring pedestal bases shall have a bonding strength capable of resisting an overturning moment of 113 Newton-meter when a force is applied to the top of the pedestal in any direction.
  3. Stringers
    1. Stringers shall provide seating for panels to preclude tilting, rocking, or vibrating when a live load is applied.
    2. Stringers shall be provided that can be added or removed after floor is in place.
    3. Each stringer shall support at least 1112 Newton at midspan with a safety factor of not less than 3 based on yield strength of the material being used and shall support at least 2890 Newton at mid-span without failure when tested.
    4. Stringers shall be made of galvanized steel.
    5. Stringers shall be covered with a conductive vinyl gasket pad to provide additional plenum seal. Gasket pad shall fit snugly on top of stringer to prevent loss and help avoid lateral movement of panels during installation. 2. Note: Delete Next Paragraph If Snap-On Stringers Are Used: 3. Stringers shall support a 204.11 kg load at center span upon one square inch area with a permanent set not to exceed .025cm.

        Note: Select Type Of Stringer From The Following:

      1. Snap-On Stringers shall be 1.59 cm x 2.86 cm x 18-gauge steel channel, formed to provide snap lock action onto pedestal head and be able to snap on with no tools required.
      2. Bolt-On Stringers shall not be less than .3937cm x 18-gauge steel tubing machined to interlock with pedestal head using .6 cm diameter screws which fasten from top side using standard screwdriver.
    6. High-Pressure Laminate (HPL) shall be 3.2mm or 1.6mm thick. Colors shall be selected from manufacturer's standards.


    Air supply floor panels shall meet the design criteria specified for standard panels. Air supply panels shall be fabricated of 1.9 millimeter perforated steel sheet welded to minimum 1.6 millimeter side channels, and shall be covered to match floor panels, and shall have a uniform perforated pattern to allow even air distribution.

    Air supply floor panels shall have galvanized dampers adjustable from the top of the panel, and shall provide minimum 25 percent free area. Contractor shall furnish air supply floor panels with adjustable dampers.

  2. Ramps, steps, handrails, fascia cutouts, plenum dividers, and cove base shall meet manufacturer standards, supplied as contract drawings specify. Ramp closure plates shall be 1.5 millimeter aluminum plate. Nose pieces shall be extruded aluminum.
  3. Provide 1 panel lifter of proper type.
  4. Provide 1 spare floor panels and square feet of understructure maintenance stock.


Part 3 - Execution
  1. Qualifications
    1. Access floor installing contractor shall be approved and authorized by manufacturer and provide all labor, equipment, and services needed for installation according to manufacturer's recommended procedures.
  2. Installation
    1. Access floor shall be installed under the direction of an experienced supervisor according to manufacturer instructions and recommendations.
    2. Design and workmanship shall be such that the floor, as installed, shall be completely planar within plus or minus 1.5 millimeter in 3048 millimeter, 2.5 millimeter for the entire floor, and 0.7 millimeter across panel joints.
    3. Access floor installer shall be responsible for removing any debris created by floor installation and leaving area in a clean condition.
    4. General Contractor shall be responsible for protecting finished access floor from damage and misuse by other trades. Note: Any specification that does not alter published performance minimums is subject to change without notice.
    5. Floor-panel joint-width tolerances shall be 0.20 millimeter as measured with a feeler gauge at any point in any joint when the panels are in the pressure contact required in final installation.
    6. Floor panels shall be machined square to within plus or minus 0.13 millimeter with edge straightness plus or minus 0.064 millimeter. Tolerances shall apply to the panel before the plastic edging is applied.