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TATA Shaktee CG Sheet

Over the years, TATA Steel has altered the landscape of the roofing industry in India. The company has been a pioneer in the field of manufacturing superior quality TATA Shaktee Galvanised Corrugated (GC) sheets.

Manufactured with world-class technological expertise, these GC sheets are stronger and longer lasting than any other ordinary GC sheets. TATA Shaktee GC Sheets are not only made of virgin steel processed at TATA Steel's state-of-the-art Cold Rolling Mill but also have uniform Zinc coating on them, which gives them the required strength in fighting the weather and to last longest.

Depth and Pitch of the GC
Class	Depth of the GC	Pitch of the GC
A	17.7 mm	75 mm
B	12.5 mm	75 mm

Physical Profile
Thickness (mm)	Length	Width (mm)
0.30	1830 mm (6 ft)	910
0.35	2140 mm (7 ft)	1220
0.40	2440 mm (8 ft)
0.45	2745 mm (9 ft)
0.50	3050 mm (10 ft)
0.55	3660 mm (12 ft)
0.60	4270 mm (14 ft)
0.63	4880 mm (16 ft)
0.80

Coating

TYPE OF COATING	Galvanised (Zinc) Spangled
COATING WEIGHT	120 gsm (gram per square metre), Class 8 (as per BIS) (For tailor made products Zinc coating, may vary between 60-600 gsm)

Tolerance Levels

PARAMETERS		BIS	TATA SHAKTEE
LENGTH		+ 15 mm, - 0	+ 15 mm, - 0
WIDTH	Before corrugation	+ 10 mm, - 0 mm	+ 10 mm, - 0 mm
WIDTH	After corrugation	± 25 mm	±15 mm
THICKNESS		± .05 mm	± .03 mm
DIAGONAL DIFFERENCE		Should not differ more than 20 mm	Should not differ more than 20 mm
DEPTH OF CORRUGATION		± 2.5 mm	± 2.5 mm
PITCH OF CORRUGATION		± 5 mm	± 5 mm

Slope

End Lap of Sheets

ROOF SLOPE	FOR ROOF CLADDING	FOR WALL CLADDING
1 in 3 (18º)	150 mm	100 mm
1 in 4 (14º)	200 mm	100 mm

Side Lap of Sheets

FOR ROOF CLADDING	FOR WALL CLADDING
1½ CORRUGATIONS	1 CORRUGATION

END OVERHANG (x)	SIDE OVERHANG (y)
300 mm	100 mm

Accessories

Usage of recommended accessories leads to enhanced life of Roofs and Walls. Poor and substandard quality
of accessories may adversely affect the superior quality of cladding sheets leading to reduced life.
Accessories and the cladding material should have similar life expectancies as that of the main structure and
hence criteria for selecting the accessories such as Fasteners, Gutters and Flashings must be based on the
design life of the structure.

FASTENERS

Researches executed on causes of steel building failures worldwide indicate that almost 80% of failures start
from the fasteners. Since fasteners, used on cladding and structure together, constitute roughly 6-8% of the
entire project cost, several builders have the tendency to neglect this vital aspect of their project.

Fasteners used on steel Roof and Wall Cladding must be of good quality and properly galvanized conforming
to IS:730 standards. This will go a long way in providing a weather proof and long lasting roof. Different
components of good quality fastener is depicted below in Figure-8.

There are various kind of hooks and screws available in the market depending upon the material and type of
purlins on which sheets need to be fixed (Figure-9). G.I. Hook Bolt should be used for fixing sheets to angle
Iron purlins. G.I. Crank Bolt should be used for fixing sheets to channels or rectangular/square tubes purlins.
G.I. Coach screw (square head) should be used for fixing sheets to wooden purlins only.

TYPICAL FASTENERS FOR CLADDING	TYPES OF HOOKS/SCREWS



The rubber washer should be 25 mm in diameter and 3 mm thick with 6 mm bore to suit 8 mm diameter bolts. This bond between rubber washer and bolt ensures water proof sealing. The G.I. flat washer is 25 mm in diameter (if it is a round washer) and 1.60 mm thick with central hole to suit 8 mm diameter fixing bolt or screw. The sheets are fastened to purlins (in case of Roof Cladding) or side girts (in case of Wall Cladding) by minimum 8 mm diameter hook bolts at a maximum pitch of 375 mm.

LIFE COMPARISON OF FASTENERS USED WITH RUBBER AND BITUMEN WASHERS

Usage of recommended fasteners enhance sheet
life.

Usage of poor quality fasteners lead to rusting that
begin at the joints and spreads to the sheet
reducing sheet life.

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