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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
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 sheet
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 sheet
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.