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680 INSTALLING BOARDS
• Fixing boards to grids: Screw boards securely and firmly to grid members.
• Surface: Provide a flat surface free from bowing and lipping. Set heads of screws
below surface of boards and fill flush with surface.
• Movement joints: Provide as appropriate for the area of ceiling and align with
movement joints in surrounding structure.
• Boards applied in two or more layers: Stagger joints.
• Board edges: Fully support. Screw to grid members.

700 COORDINATION WITH SERVICES
• Preparation: Check existing position of services against proposed alterations.
• Clashes between services and ceiling system: Give notice.
• Coordination: Programme works to minimise impact.
• Services disconnection: Give notice.

710 INTEGRATED SERVICES
• General: Position services accurately, support adequately. Align and level in
relation to the ceiling. Alterations must not diminish performance of ceiling system.
• Surface spread of flame rating of additional supporting material: Match ceiling
material.
• Services outlets:
- Supported by ceiling system: Provide additional hangers.
- Independently supported: Provide flanges to support altered ceiling system.

715 LUMINAIRES
• Independently support luminaires: Adjust suspension to line and level of ceiling as
necessary.
• Surface mounted luminaires: Do not inhibit designed grid expansion in fire.
• Modular fluorescent recessed luminaires: Compatible with ceiling module.
Extension boxes must not foul ceiling system.
• Continuous recessed rows of luminaires: Provide flanges for support of grid and infill
units, unless mounted above grid flanges. Retain in place with lateral restraint.
• Fire protecting and resisting ceiling systems: Luminaires must maintain protection
integrity of ceiling system.
• Access: Provide access for maintenance of luminaires.

720 MECHANICAL SERVICES
• Fan coil units:
- Inlet and outlet grilles: Trim ceiling grid and infill units to suit.
- Void clearance beneath: Sufficient for ceiling system and fan coil components.
- Suspension and connections: Permit accurate setting out and levelling of fan coil
units.
• Air grilles and diffusers:
- Linear air diffusers: Provide flanges for support of grid and infill units. Provide for
displacement of ceiling grid. Retain in place with lateral restraint.
- Grille and diffuser ceiling joints: Provide smudge rings and edge seals.

725 OTHER SERVICES 6118-AEW-XX-XX-NBS-A-01
• Smoke detectors and PA speakers:
- Infill units: Scribe to suit.
- Flexible connections: Required.
• Sprinkler heads: Carefully set out and level.

RotF generic (intermediate) NBS 2014