D. Planning, Scheduling, and Job Site Preparation
The installation of an access floor requires a thorough understanding and control of the building space receiving the access floor. This must include the following:
- Size and configuration of the floor area.
- Location within the building.
- Means of access to the area; elevator, stairs, street level, loading dock, etc.
- Location and type of all equipment and services that will be in or on the floor.
- Power available during installation (110-volt supply, minimum.)
- Work schedule of the other trades. All overhead work should be complete before access floor is installed. If overhead work is done after access floor installation and it is used as work platform, permanent damage can occur to the floor panels or the finished covering on the panels.
- The customer must provide a dry accessible area to receive and unload material with a free path to elevator, hoists and/or the area receiving the access floor material.
- Prior to start of installation a dry, secure storage space must be made available for the access floor materials; it should be adjacent to the area where the floor will be installed.
- The installation area must be closed to the weather with the recommended environment at 50° F to 90° F and 20% to 70% relative humidity, 24 hours a day during and after installation.
- The installation area should be free of other trades and their material.
- The subfloor surface must be free of moisture, dust, dirt, and other debris. Preferably the subfloor should be sealed to prevent excessive dusting. Make certain sealer is compatible with the pedestal adhesive. Test apply several pedestals as early as possible to be sure desired bond is achieved.
- Uneven subfloors. There are several methods which can be used to compensate for a bumpy subfloor, and these may vary according to the amount of unevenness detected:
- slight: pedestal adhesive will compensate.
- pronounced: either remove with concrete grinder or use wood, metal, or concrete shims to compensate; the type of shim should be approved by the customer.
- Subfloor other than concrete. Be careful of wood subfloors, vibration isolation panels, or concrete floors with existing floor coverings. If you cannot avoid putting access floor over these floors, you should verify and test for the conditions that may result in an unacceptable installation.
- The access floor personnel should verify that the work area conforms to the contract drawings and that the starting point is agreeable prior to commencing work.
- No personnel, other than experienced access floor installers, should be allowed on the floor until the following conditions have been met: the perimeter is installed on at least three sides of the room; the pedestal adhesive has cured for a minimum of two days; and the access floor has been inspected for acceptance.