## 9.1.20 Stairs, handrails and balustrades 

Specifications for stairs, handrails and balustrades are given in Section 6: Mechanical Works. 

## 9.1.21 Suspended ceilings 

Suspended ceilings shall be of the lay-in metal suspension system type. 

Ceiling tiles shall be mineral fibre pre-painted smooth finish tiles, sized 600 x 600 x 19 mm with square edges and be laid into galvanised steel tee suspension grid. Additional support shall be provid- ed by galvanised pressed steel channel sections at 1200 mm centres set at right angles and clipped to primary tees and suspended from structural ceiling by wire or steel angle suspension members, also at 1200 mm centres. 

Edge trim angles shall be fixed to perimeter walls. The exposed faces of suspension tees and edge trim shall be pre-painted. 

All necessary couplings and clips shall be provided. 

Openings shall be formed in ceilings to accommodate air conditioning grills, where applicable, and recessed light fittings. 600 x 600 mm tile sized galvanised steel hinged access panels and frames shall be provided in ceilings as required for servicing mechanical and electrical equipment in the ceiling void. The panels shall be finished with matching tiles. 

Movement joints shall be provided in suspended ceilings where required. The ceiling shall end on ei- ther side of the joint at a steel tee. A strip of pre-painted galvanised steel sheet shall be loose laid in the suspension grid and access the joint. 

Where suspended ceilings change level, or abut windows and louvers, bulkheads shall be formed. These shall either be constructed from steel angle frames filled with plasterboard or dismountable par- titioning construction. 

Suspended ceilings shall be installed after wall finishes have been applied. 

## 9.1.22 Painting 

## 9.1.22.1 General 

Painting title covers the general requirements and standards of workmanship and the painting and pro- tective coatings required to be carried out by the Contractor of the works, except where particularly redefined in individual specification clauses or as necessary due to a particularly corrosive local envi- ronment, the possible reaction of escaping chlorine on the works or on the structures or the reaction of chlorine residuals on phenolic paints (e.g. inside pipelines) , harmful or toxic paint in contact with process liquids, or other special requirements, in which case the Contractor submit his own special specification along with his tender. 

No alternative or substitute painting standard or specification will be accepted unless it is specifically required for the above stated reason. No painting or protective coating will be accepted by the Engi- neer unless it is at least to the standard and of the quality specified herein. 

## 9.1.22.2 Contractor's Responsibility 

The Contractor shall be responsible for the complete cleaning, preparation, priming, painting and pro- tection of the works carried out by him. 

