SUSPENDED CEILING WORK

1.0 OBJECTIVE

To describe the procedure for installing suspended ceiling for the buildings under the contract no GTC.101/ED/01 Engineering, Procurement, Installation and Commissioning (EPIC) of Ras Laffan Utilization Project –Buildings and utilities and support service Phase 1-Utilities.

2.0 SCOPE

To install suspended ceilings in the buildings at Service Berth, Service Base and F.S.O Marine areas

3.0 REFERENCE

3.1 Project Approved Architectural Drawings

3.2 Qatar Construction Specification Section 24 Part 14

3.3 Manufacturers recommendations.

3.4 British Standards BS 1377, BS 1191 and BS 5492

4.0 PROCEDURE

• MATERIAL APPROVAL

• Approval of ceiling material like framing sections, ceiling board, panels etc should be taken from QP engineer before proceeding with ceiling works. All the approved materials sample should be available at site for reference.

• APPROVAL OF SHOP DRAWINGS

• Approval from QP shall be obtained for shop drawings showing the general layout, support framing, and installation details including lay-in, hanger and support details.

• GENERAL REQUIREMENTS OF CEILING WORKS

• The suspended ceiling works shall be taken up only when:

1. The building is weather tight

• The wet trades have finished their work

• All works above the ceiling such as ductwork, pipe work, and electrical work had been installed, tested, inspected and approved by QP.

• The positions of light fittings, diffusers and the like have been checked.

• The positions of access panels have been confirmed with the QP engineer. 

• All the services have been installed.

• The fastenings and supports installed by others are rigid and secured in place.

• The installation of other services shall not touch the back of the ceiling. 

• QP engineer’s approval shall be obtained for the clearance before proceeding with ceiling works.

• The manufacture’s recommendations shall be followed for installation of ceilings unless as agreed with QP engineer.

• LAY-IN TYPE SUSPENDED CEILINGS

• MATERIALS APPROVALS

1. The lay-in material shall be tile, plank or strips and shall be approved by QP engineer

• The lay-in material shall have a fire performance when tested in accordance with BS 476 part 6,7. A test certificate for this purpose shall be submitted to QP for the review and approval. 

• INSTALLATION

1. The ceiling works shall be installed within 3 mm of required level, when measured against a straight over a distance of 3 m.

• The ceiling tiles shall be set out so that the soffits are level, free from undulations and lipping, with all lines and joints straight and parallel to walls unless shown other wise.

• They are symmetrical about the centre lines of the roof, or space, beginning with a tile or joint line as required avoiding narrow tiles at the perimeter edges.

• All junctions between the ceiling and walls, and between the ceiling and columns, the ceiling shall be finished with perimeter edge trim. The trim shall be fixed at maximum 450 mm centers.

• Additional hanging supports shall be provided between the floor or roof structure above and the suspended ceiling at all access panels, light fittings, diffusers ect. The lay-in material shall be accurately cut to accommodate all such fittings. Under no circumstance shall the lay-in material support any fitting.

• Care shall be taken to ensure that the tiles, strip ceilings are kept clean if subsequently removed for access to services, for inspection or for the remedial work.

• FIXED TYPE SUSPENDED CEILINGS

• GENERAL:

1. Gypsum board will be used for fixed type suspended ceilings unless otherwise indicated in the Drawings.

• Installation of gypsum board for suspended ceilings and associated plaster or rendering work shall comply with the relevant provisions of BS 1191 and BS 5492.

• MATERIALS:

1. Gypsum wallboard shall be as per approved thickness complying with BS 1230, having one face finished for direct decoration.

• The edge profiles of wallboard shall be:

1. “Tapped “ for smooth seamless jointing.
   1. “Beveled” for V-jointing.
   1. “Square” for stippled textured coatings, corner strip jointing or plaster.

• Accessories for installing wallboard shall be QP approved proprietary materials recommended by the manufacturer’s, inclusive of the following:

• Soffit assemblies, where indicated on drawings consists of galvanized steel channel runners and studs faced with gypsum panels, screw attached unless specified otherwise and approved by the QP engineer.

• Hangers, hanger attachments, support carrier members with connecters, screws, and trim members related to ceiling as is required for complete.

• Fabricated miscellaneous clips, splices, connectors, screws, and other standard metal accessories of strength and design compatible with the suspension methods and system.

• INSTALLATION:

1. A complete setting out of the ceiling area for lines and levels have to be carried out prior to framing works. And the levels have to be approved by the QP engineer.

• Adequate preparation is to be made for the attachment of hangers and fasteners and provide for the support and incorporation of flush- mounted and recessed fittings and services components.

• The ceiling system shall be installed in accordance with manufacture’s recommendations and to BS 8290 part 3.

5.0 RECORDS:

• Materials approval.

• Checklists

• Inspection reports.