NATIONAL ALUMINIUM COMPANY LIMITED - Rites

(b) In toilets: Ground glass of minimum thickness 4 mm.
(c) In other areas: Toughened glass of minimum thickness 4 mm The above mentioned glass
thickness are bare minimum only and actual thickness will depend on the panel size of the
glazing to be provided.
21.0 False Ceiling
All air - conditioned areas, shall be provided with the suspended permanently colour coated
aluminium false ceiling system with corrosion resistance aluminium alloy panels of m mminimum
thickness 0.5 mm. 50 mm thick mineral wool insulation (as per IS: 8183) having a density of
32 kg/cum for glass wool or 48 kg/cum for rock wool, bound in polythene bags shall be laid
on top of panels. Additional hangers and height adjustment clips shall be provided for
returns air grills, light fixtures, A. C. ducts etc. Suitable M. S. channel (Minimum ISMC 75)
grid shall be provided above the false ceiling level for movement of personnel to facilitate
maintenance of lighting fixtures, AC ducts etc. Under deck insulation shall be provided on
the ceiling (underside of roof slab) and underside of floor slab of air - conditioned areas
depending upon the functional requirements. This under deck insulation shall consist of 50
mm thick mineral wool insulat insulation ion mat conforming to IS: 8183 having a density of 32 kg/cum
for glass wool or 48 kg/cum for rock wool, backed with 0.05mm thick aluminium foil and 24G
x 25 mm mesh wire netting and shall be fixed to the ceiling with 14G wire ties.
22.0 Acid / Alkali Resis Resistant Lining
Battery Room For Floor and dado, bitumen primer followed by 12 mm thick bitumastic 6 mm
thick potassium silicate mortar bedding and 20 mm thick A. R. tiles shall be provided. Dado
height shall be minimum 2.0 m from floor. M. S. Grating / Cheque Chequered red plate cover and any
other steel structure likely to come in contact with chemicals shall be provided with epoxy
coating 150 microns thick over epoxy primer. Acid / Alkali resistant lining material shall
conform to the following: Bitumen primer shall co conform nform to IS: 158. Bitumastic compound
shall conform to IS: 9510. Where the height of bitumastic layer on vertical surface is more
than 2.0 m, the bitumastic layer shall be reinforced with diamond pattern expanded metal
steel sheets conforming to IS: 412. A. R. tiles shall conform to IS: 4457. Mortar: Potassium
silicate and resin type mortars shall conform to IS : 4832 Parts – I and II respectively.
23.0 FINISHING SCHEDULE
The contractor's scope also includes all doors, windows, glazing, rolling shutters, f ffinishes,
damp proofing, inserts, anchor bolts, embedments, stairs, nosing, railings, toe - guards,
ladders, edge protection angles, etc. The Contractor shall adhere to the finishing schedule as
given.
23.1 Flooring
I. P. S. ( cement concrete flooring ) with metallic hardener topping shall be provided for all
floors in transfer houses, including ground floors of transfer houses, ground conveyors,
operating floor of pump houses, M. C. C. rooms, cable vault / cable spreader rooms,
maintenance enance and unloading areas, general storage areas and all other areas in plant
buildings where heavy duty flooring is required. Heavy Duty Ceramic Tiles ( matt finish ) shall
be provided for toilets, office rooms, laboratories, control rooms and control eq equipment
rooms. Well polished Kota stone shall be provided for staircases, passages, lobbies and
general circulation areas. The floor shall be laid on an already laid and matured concrete
base. Sunken R. C. C. slab shall be provided in toilet area so as to keep the finished floor
level of these areas same as that of the surrounding area Wherever specified metallic
hardener topping shall be 12 mm thick using uniformly graded iron particles, properly
treated. Wherever specified Heavy duty ceramic tiles of siz size e 300 x 300 x 7 mm thick
(minimum) of reputed manufacturer (Kajaria, Spartek or equivalent) of approved finish,
shade and colour to be used. The tiles shall have a scratch resistance of minimum 5 on
Mohr’s scale and shall have a bending strength of 350 Kgs Kgs. . / cm.2 Paving details shall be
similar to grade slab excluding metallic hardener. Skirting in general shall be 150 mm high.
Technical Specification:Sec-7, Civil
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