Flooring tiles shall be Terrazzo tiles of approved co-ordinated dimensions and of the best quality available in Turkey and shall generally comply with the requirements of TS 213-1 EN 13748-1. The quality and color shall be approved by the Engineer. Therefore the Contractor shall submit some sam- ples to the Engineer before ordering the tiles. 

The tiles shall be bedded and pointed in 1: 3 Portland cement-sand mortar. Broken or scratched tiles shall not be used. 

A tile skirting, with the same kind of tiles, shall be provided for all areas where the floor is tiled. 

Flooring tiles shall be laid evenly with joints of 3 mm. Where gullies and/or drainage facilities are provided, the tiles shall be laid with a slight slope towards these outlets to ensure good run-off of sur- face water. 

All joints shall be completely filled with mortar. 

Tile work on foundation blocks, supports, etc., for the mechanical and electrical equipment shall be carried out after installation of the equipment. 

## 9.1.9 Parquet floors 

Wood floors shall be massive laminated parquet of abrasion class 32 (AC3) and shall comply with TS EN 13227. 

## 9.1.10 Computer flooring 

Computer flooring, where applicable, shall be a proprietary modular flooring system in which square floor panels are fitted into a gridded support overlying a cavity containing power and telemetry cables. The removable panels shall not be less than 500 mm or more than 700 mm square form, and shall be non-conducting and carpeted with anti-static material. 

The grid system and its supports shall be of approved materials, and shall be designed such that the deflection of the floor under personnel loading does not exceed 1 mm at any point. 

The Contractor shall, if required, hand over to the Engineer two special tools for lifting computer flooring panels. 

## 9.1.11 Preparation for flooring 

The surfaces must be cleaned prior to flooring. The base for covering to be placed without underlay shall be smoothed with filler compound. In the case of major unevenness a suitable levelling com- pound shall be used. 

Any filler or levelling compound shall be applied so that it will bond firmly and durably to the base, will not crack and will adequately withstand pressure. Any screeds such as magnesia and anhydride screed to which the filler or levelling compound will not sufficiently bond, shall receive a priming coat. 

All finished surfaces shall be properly protected until completion of the contract. Terrazzo tile and in- situ flooring shall be protected with a layer of clean sawdust. PVC tile floors and carpets shall be pro- tected with polythene sheeting. 

