- Access floor contractor shall provide submittals, materials and installation of the access floor system as shown on the contract drawings and as specified in this document.
- General contractor shall provide clear access, dry secure storage, and a clean subfloor area which is free of construction debris and other trades during installation of the access floor system. Area to receive the access floor shall be enclosed and maintained at a temperature range of 40 degrees to 90 degrees F and a humidity range of 20% to 70% relative.
- Concrete sealer shall be compatible with access floor pedestal adhesive, see Division 3.
- Electrical contractor shall provide necessary material and labor to electrically connect the access floor to the building, see Division 16.
- Access floor system shall consist of interchangeable square panels selected to meet specific load requirements. Panels shall be supported by adjustable pedestal assemblies which positively locate, engage and secure panels and which accommodate horizontal grid members when specified.
- Finished floor height of the system above the subfloor shall be shown on the contract drawings.
- Submit drawings showing complete access floor system including floor panel layout and all accessories that are a part of the system.
- Submit details and descriptive notes for finishes of components, anchoring, edge details, and interfaces with adjoining work.
- Submit for approval one full size floor panel with finished surface and understructure components for each type of access floor being supplied.
Submit certified laboratory test data for approval which indicates that the supplied system complies with the performance indicated herein.
- Test Methods:
- Test methods for concentrated, ultimate, rolling, overturning movement, and axial loads shall be in accordance with the "Recommended Test Procedures for Access Floors" as published by CISCA, the Ceilings and Interiors Systems Construction Association.
- Test Method for Impact Load: Panel without floor covering shall be supported on actual understructure. An impact load is applied to the panel via a one square inch indentor which is struck by a predetermined load dropped from a height of 36". The panel shall be loaded at its weakest point. Weakest point to be determined by an independent test lab.
- Test Method for Electrical Resistance: The electrical resistance of the access floor system shall be tested in accordance with NFPA 99. The test is modified for access floors where one electrode is placed on the floor surface covering and the other electrode is attached to the understructure.
Access floor system shall be manufactured by Tate Access Floors, Inc. Alternative products shall meet or exceed design criteria.
- Floor Panels: Shall consist of either 24" or 60 cm steel top sheet welded to a formed steel bottom pan and a painted finish. (All Steel.)
- Understructure System
TYPE OF UNDERSTRUCTUREFINISHED FLOOR HEIGHTStringerless7" - 18"Cornerlock7" - 24"Bolted Stringer7" - 30"
NOTE: For special lateral load requirements (i.e. seismic environments) contact the Tate Technical Hotline. The understructure system to be supplied shall be: (Select type) ____________
- Pedestal Assembly
- A 30" FFH assembly shall provide a 8000 lb. axial load without permanent deformation.
- Assembly shall provide a range of adjustment from 1" to 2" total.
- Provide a means of leveling and locking the assembly at a selected height which requires deliberate action to change height setting and which prevents vibrating displacement.
- Pedesta Bases
- Fabricated of a square base with not less than 16 square inches of bearing area and assembled to a stud or tube which is designed to engage the pedestal head assembly; secure to subfloor in accordance with manufacturer's instructions.
- Pedesta Heads
- Fabricated of a head plate with a corresponding stud or tube which is designed to engage the pedestal base assembly. The head must be the proper type to positively locate the floor panel or to receive a stringer system. When specified, the head shall provide a means to fasten the floor panel or stringer directly to the head.
- Stringer System
- (include this section if stringers are required). a. Stringer system shall be all steel construction, designed and fabricated to interlock with pedestal head and to form a modular grid pattern with members under edges of all field floor panels. Stringer to be __________ (bolted to or snapped on) the pedestal head.
- Cornerlock Fastener
- (Include this section if a cornerlock-bolt down panel system is required). Floor panels shall be provided with four corrosive resistant, captured fasteners which remain with the panel when removed. Panels shall be removable by releasing the four fasteners and shall remain positively locked onto the pedestal head without the fasteners in place.
- Pedestal Assembly
- System Performance
- Concentrated Load Performance:
- Panels shall be capable of supporting a concentrated load of ________ lbs. placed on a one square inch area at any location on the panel with a maximum top surface permanent set not to exceed 0.010 inches after load is removed.
- Uniform Load Performance:
- Panels shall be capable of supporting a uniform load of _____ lbs. placed on a one square foot area.
- Ultimate Load Performance:
- The ultimate strength of the floor system shall provide a loading capacity of ______ lbs. without failure. Failure is defined as the point at which the system will no longer accept the load.
- Rolling Load Performance:
- Local and overall surface deformation shall not exceed 0.040 inches.
- ImpactLoad Performance:
- Panels and supporting understructure shall withstand without failure an impact load anywhere on the panel of ______ lbs. dropped from a height of 36 inches onto a one square inch area. Failure is defined as the point at which the panel will no longer accept the load.
- Concentrated Load Performance:
- Floor Surface Covering
- Finish the surface of floor panels with floor covering material indicated on contract drawings or in this specification. Where floor coverings are by the access floor manufacturer, the type, color and pattern to be selected from manufacturer's standards.
- Vinyl edge trim for the tile coverings shall be mechanically locked and bonded to the panel surface and flush with the surface covering.
- Service outlets to be provided in locations and as detailed on the contract drawings. Outlets to accommodate power, communications and data wiring.
- Air Flow Panels shall be all steel welded construction with a 25% open air perforated top sheet and shall be supplied ______ (with or without) an adjustable damper assembly. Panels shall be capable of supporting a design load of ________ (1000 or 1250 lbs). Panels with an adjustable damper assembly and 1250 lb design load shall provide 525 CFM at a static pressure of 0.1" H2O. Panels without an adjustable damper assembly shall provide 800 CFM at a static pressure of 0.1" H2O.
- Provide _______ spare floor panels and _______ square feet of understructure systems for each type used in the project for maintenance stock. Deliver to project in manufacturer's standard packages clearly marked with the contents.System Type
- Provide _________ panel lifting devices.
System Type System
Static Loads Rolling Loads Impact
Cornerlock 6.0 lbs./ft²
Bolted Stringer 6.5 lbs./ft²
Note: Loads applied on a one square inch area. Results above indicate weakest point of panel.
- Floor system and accessories to be installed by the manufacturer's authorized representative to maintain the integrity of the products and acceptable performance of the completed installation.
- Examine subfloor for unevenness, irregularities and dampness that would affect the quality and execution of the work.
- Do not proceed with installation until subfloor surfaces are clean, dry, clear of other trades and ready to receive access flooring.
- Preparation and Installation
- The access floor to be prepared and installed in accordance with the access floor manufacturer's instructions covering preparation, layout, alignment and installation.
- Installed access floors shall be level within plus or minus 0.060 inches in 10 feet, and plus or minus 0.10 inches over the entire area. Floor to be rigid and free of rocking panels.
- Adjust and Clean
- Remove access floor installation debris as work progresses, maintaining area under finished floor in a clean condition.
- The general contractor is to protect the finished access floor from damage and misuse.