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ROOF AND WALL CLADDING

BRAND 1 BRAND 1

BRAND 2

All new Galvanised Roofing Sheets look alike...

Right Hardness for Roofing

Maximum Strength

Optimum Chromating

Uniform Zinc Coating

Excellent Zinc Adherence

Assured Thickness

Accurate Dimension

Superior Packaging

Printed Thickness and Zinc Coating

Fixed and Transparent Pricing

Perfect Overlapping

Superior Distribution Network

...but only the best stand the test of time.

TATA Shaktee GC sheets truly last the longest. After all, they are brought to you from the house of TATA's. The sheets pass through stringent quality tests that ensure uniform Zinc coating, proper hardness for roofing, superior Zinc adherence, high tensile strength and accurate dimensions. All this and more add up to the quality valued by millions of consumers over decades.

FOR MORE DETAILS, PLEASE GET IN TOUCH WITH MARKETING & SALES Tata Centre Tata Steel Limited 43 Jawaharlal Nehru Road, Kolkata 700 071 Phone: (91) (033) 2288 7051/ 3061/ 1951 Fax: (91) (033) 2288 5926 e-mail: tatashaktee@tatasteel.com

PHONE NUMBERS OF SALES OFFICES

Chennai Delhi Kolkata Mumbai Ahmedabad Aurangabad Bangalore Chandigarh Faridabad Guwahati Indore Jaipur Jamshedpur Kanpur Ludhiana Nagpur Pune

: Ph: (044)6696 0008 Fax:(044)2826 9101 : Ph: (011)5535 9659 Fax:(011)2334 3196 : Ph: (033)5550 8154 Fax:(033)2288 1687 : Ph: (022)2267 5945 Fax:(022)2261 9902 : Ph: (079)6661 2606 Fax:(079)5561 2604 : Ph: (0240)562 1477 Fax:(0240)562 1478 : Ph: (080)5699 5111 Fax:(080)2532 5527 : Ph: (0172)507 5116 Fax:(0172)279 2426 : Ph: (0129)6451 1822 Fax:(0129)242 7734 : Ph: (0361)252 3093 Fax:(0361)254 2582 : Ph: (0731)507 3082 Fax:(0731)253 5951 : Ph: (0141)511 2902 Fax:(0141)511 2906 : Ph: (0657)227 3202 Fax:(0657)227 0685 : Ph: (0512)231 6605 Fax:(0512)231 6631 : Ph: (0161)267 3759 Fax:(0161)267 3459 : Ph: (0712)252 2209 Fax:(0712)253 7078 : Ph: (020)404 8815 Fax:(020)404 8828

Secunderabad : Ph: (040)5526 1040 Fax:(040)2781 2418
Authorised Distributor

DISCLAIMER Without Prejudice Any representation, statement, opinion or advice expressed or implied in this brochure is made in good faith and solely the opinion of its authors. The brochure is released for general information only and is not a substitute for competent professional examination and verification in regard to accuracy, suitability and/or applicability. Anyone making use of the information available in this brochure assumes all liability arising from its use.

25

CONTENTS

INTRODUCTION THE SHAKTEE EDGE TATA SHAKTEE SPECIFICATIONS WIND FORCES ROOF AND WALL CLADDING TATA SHAKTEE WIDER - SAVINGS UNLIMITED ACCESSORIES GUIDELINES FOR INSTALLATION GENERAL CARE AND MAINTENANCE SHAKTEE EDGE - AT A GLANCE OFFICE ADDRESSES

1 2-5 6-7 8-9 10-12 13 14-17 18-21 22-23 24 25

INTRODUCTION

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.

Living up to the company's assurance of good quality and trustworthy products, these sheets are manufactured to exact parameters of thickness, length, width and Zinc coating as per the specified requirements. In addition to this, TATA Shaktee GC sheets are ISI certified under Bureau of Indian Standards (BIS).

All in all, TATA Shaktee GC sheets give more value for money and are the best choice for anyone looking for a product that will perform year after year.

This manual has been created in order to make consumers aware of the best engineering practices involved in installation and maintenance of Galvanised Corrugated Steel sheets used in Roof and Wall Cladding applications. We have attempted to collate best practices recommended by various Indian and global standards alongwith those received from practising shed fabricators and architects.

Please feel free to send your suggestions/feedback for improvements on this manual, if any, to Brand Manager - Tata Shaktee, Tata Centre, 43 Jawaharlal Nehru Road, Kolkata 700 071

1

THE

EDGE
ORDINARY GC SHEET

TATA SHAKTEE G C SHEET

RIGHT HARDNESS FOR ROOFING

Accurate tempering in TATA Shaktee GC Sheets resist cracks and fissures during drilling.

Uneven tempering causes ordinary sheets to crack during drilling.

HIGH TENSILE STRENGTH

High tensile strength (approx 700 mpa) of TATA Shaktee GC Sheets resist natural forces like hailstorms and other external forces.

Low tensile strength of ordinary sheets results in damage/rupture caused by hailstorms and other external forces.

EXCELLENT ZINC ADHERENCE

Superior technology and process control ensures proper surface cleaning before coating. This means a cleaner steel surface that results in excellent Zinc adherence.

Inferior technology and process control results in unclean steel surface leading to low adherence of Zinc coating. This causes the galvanised surface to peel off resulting in reduced sheet life.

2

THE

EDGE
ORDINARY GC SHEET

TATA SHAKTEE G C SHEET

UNIFORM ZINC COATING

Uniform 120 gsm Zinc coating ensured by the sophisticated FEED FORWARD X-RAY COATING GAUGE results in even surface protection.

Non-uniform Zinc coating cause parts of galvanised surface with low Zinc coating to corrode faster. This reduces the sheet life drastically.

ASSURED THICKNESS AND ZINC COATING

Each sheet has its thickness and Zinc coating printed on it to ensure that the customers get what they have paid for.

Thickness of the sheet and the Zinc coating applied to it is not mentioned and even if it is, it is generally incorrect. As a result, customers are often cheated during purchase.

PERFECT OVERLAPPING

Even corrugations ensure perfect overlapping which results in improved weather-proofing. Moreover, there is no unwanted retention of particles and moisture between the overlapped joints. This prevents corrosion originating from overlappings.

Uneven corrugations and edge waviness lead to gaps in overlapping, resulting in a badly fabricated roof. Unwanted particles and moisture stuck between the sheet overlappings results in corrosion starting from the joint.

3

THE

EDGE
ORDINARY GC SHEET

TATA SHAKTEE G C SHEET

ADEQUATE CHROMATING

Usage of the best and adequate chromate solution at the galvanising stage prevents formation of white rust on the sheets. As a result, sheet life is enhanced.

In case of ordinary GC sheets, inadequate chromating on the galvanised surface results in formation of white rust on the sheets that reduces sheet life.

ACCURATE DIMENSION

10 Feet 3050 mm

The length of the sheet is equal to the standard specified length, giving you true value for your money.

Ordinary sheets,quite often, are of lower length than the standard length specified. As a result you get lesser value for your money.

ASSURED THICKNESS
0.6Omm 0.54mm

TATA Shaktee GC sheets come with assured thickness. The tolerance maintained is more stringent than the standards defined by Bureau of Indian Standards (BIS).

In ordinary GC sheets, the thickness is not printed and even if it is, the actual thickness is usually lower than the thickness claimed.

4

9.9 Feet 3020 mm

THE

EDGE
ORDINARY GC SHEET

TATA SHAKTEE G C SHEET

SUPERIOR PACKAGING

Metal Band Strapping Tata Blue Seal Wooden Skids Bare Sheets Blue WovenHDPE (450microns) LDPE (250 microns) Edge Protector Identification Tags

Metal Band Strapping

Wooden Skids Bare Sheets Ordinary Plastic

TATA Shaktee GC sheets are packaged with Blue Woven HDPE (450 microns) and LDPE (250 microns) plastics alongwith edge protectors, tamper proof seals and metal jackets on the top that protects sheet quality, especially during transit.

Ordinary sheets are packaged with poor quality plastics with a metal jacket on top that is susceptible to damage during transit.

STABLE AND TRANSPARENT PRICING

PRICE

BLE NSTA U
NON T RANS PARE N
TIME

T

The Recommended Consumer Price of TATA Shaktee GC Sheets ensures the required transparency and stability in prices across the states.

Pricing of ordinary GC sheets is opportunistic and unfair, which means that prices are unstable and non-transparent, thereby subject to change even on a weekly basis.

SUPERIOR DISTRIBUTION NETWORK
SRINAGAR

JALANDHAR CHANDIGARH
DELHI

UTTARANCHAL

FARIDABAD JAIPUR

GHAZIABAD PATNA SILIGURI GUWAHATI

DHANBAD RANCHI
AHMEDABAD INDORE

J A M S H E D P U RKOLKATA

MUMBAI

BERHAMPUR RAIPUR AURANGABAD NAGPUR CUTTACK

SOLAPUR PUNE SANGLI HYDERABAD HUBLI

NO ION T RIBU RK DIST TWO NE OPPURT UNISTIC SELLING

CHENNAI

A superior distribution network comprising 3500 dealers and 28 distributors spread across the country ensures excellent reach and regular supply of TATA Shaktee GC Sheets, as and when required.

Nonexistence of authorised dealer network leads to irregular supply and even sales of substandard products.

5

SPECIFICATIONS
PHYSICAL PROFILE
THICKNESS (mm)
0.30 0.35 0.40 0.45 0.50 0.55 0.60 0.63 0.80 1.00 1.25

LENGTH (mm)
1830 2140 2440 2745 3050 3660 4270 4880

(gauge)
30 29 28 27 26 25 24 24 22 20 18

(feet)
6 7 8 9 10 12 14 16

WIDTH (mm)
800 840 910 1220

Note: (1) Width of 1220 mm is available from 0.45 mm thickness onwards. (2) Thickness of 0.60 mm in gauge term is referred to as 24 "LOW".

DEPTH AND PITCH OF CORRUGATION

DEPTH PITCH

WIDTH OF GC SHEET AFTER CORRUGATION (mm)
800 840 910 1220

DEPTH OF CORRUGATION (mm)
17.5 12.5 17.5 17.5

PITCH OF CORRUGATION (mm)
75 78 75 75

NO. OF CORRUGATIONS
10 + ½ + ½ 10 + ½ + ½ 11 + ½ + ½ 15 + ½ + ½

TOLERANCE LEVELS
PARAMETERS LENGTH Before corrugation WIDTH After corrugation

BIS
+15 mm, - 0 +10 mm, - 0 mm 25 mm .05 mm Should not differ more than 20 mm 2.5 mm 5 mm

TATA SHAKTEE
+15 mm, - 0 +10 mm, - 0 mm 15 mm .03 mm Should not differ more than 20 mm 2.5 mm 5 mm

THICKNESS DIAGONAL DIFFERENCE DEPTH OF CORRUGATION PITCH OF CORRUGATION

Note: TATA Shaktee tolerance levels are more stringent as compared to BIS specifications owing to superior process control.

6

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

Note: BIS recommends thickness of 0.63mm with Zinc coating of minimum 275 gsm. (Refer to para 7.3, Note 1 on page 2 of IS277: 1992).

APPROXIMATE WEIGHT PER SQUARE METRE OF SHEET (for 120 gsm coating)
THICKNESS (mm) APPROXIMATE WEIGHT (Kg) PER SQUARE METRE
0.30 0.35 0.40 0.45 0.50 0.55 0.60 0.63 0.80 1.00 1.25

2.25

2.65

3.00

3.40

3.80

4.20

4.55

4.80

6.10

7.45

9.25

APPROXIMATE WEIGHT PER SHEET (for 120 gsm coating)
SIZE (THICKNESS X WIDTH) (mm) 0.30 x 800 0.35 x 800 0.40 x 800 0.45 x 840 0.50 x 840 0.55 x 840 0.60 x 840 0.63 x 840 0.80 x 840 0.30 x 910 0.35 x 910 0.40 x 910 0.45 x 910 0.50 x 910 0.60 x 910 0.63 x 910 0.80 x 910 0.45 x 1220 0.50 x 1220 0.60 x 1220 0.63 x 1220 0.80 x 1220 6ft (1830mm) 3.663 4.339 4.939 5.577 6.201 6.862 7.496 7.881 10.051 4.047 4.837 5.564 6.283 6.991 8.485 8.961 11.149 8.378 9.370 11.289 11.877 15.473

APPROXIMATE WEIGHT PER PIECE FOR VARIOUS LENGTHS OF SHEET (in Kg)

7ft (2135mm) 4.296 5.007 5.766 6.508 7.235 8.013 8.753 9.205 11.737 4.724 5.656 6.496 7.323 8.166 10.013 10.387 12.998 9.767 10.922 13.191 13.844 17.092

8ft (2440mm) 4.883 5.785 6.585 7.436 8.269 9.149 9.994 10.508 13.402 5.397 6.450 7.419 8.377 9.322 11.313 11.948 14.866 11.170 12.493 15.052 15.836 20.631

9ft (2740mm) 5.494 6.508 7.408 8.365 9.302 10.293 11.244 11.822 15.077 6.071 7.256 8.346 9.425 10.487 12.727 13.441 16.724 12.566 14.055 16.934 17.815 23.210

10ft (3050mm) 6.137 7.153 8.238 9.297 10.336 11.448 12.504 13.151 16.767 6.748 8.081 9.280 10.461 11.666 14.304 14.838 18.569 13.952 15.603 18.844 19.776 24.417

12ft (3660mm) 7.325 8.678 9.877 11.153 12.430 13.724 14.991 15.762 20.102 8.095 9.674 11.129 12.566 14.000 16.980 17.922 22.298 16.755 18.740 22.579 23.754 30.946

14ft (4270mm) 8.592 10.015 11.533 13.016 14.520 16.027 17.505 18.411 23.473 9.447 11.313 13.000 14.645 16.332 20.025 20.773 25.997 19.533 21.844 26.381 27.687 34.184

16ft (4880mm) 9.767 11.570 13.169 14.871 16.537 18.298 19.989 21.016 26.803 10.793 12.899 14.838 16.755 18.680 22.626 23.896 29.731 22.340 24.986 30.105 31.672 41.262

Note: 1) BIS tolerance for the "Bundle Weight" (70/72 running feet of sheets) is 0.5%. 2) Length of 16 feet (4880 mm) is available only from 0.40 mm thickness onwards. 3) Weight per sheet for thickness 1.00 and 1.25 mm has not been indicated in the above table since these are not standard sizes. However, these sizes can be produced on demand.

7

WIND FORCES
Speed of wind creates considerable forces on both top and bottom sides of the Roof Cladding and hence one must consider wind speed and its resultant forces while designing and installing a roof. Whilst the forces acting inward through the topside of the roofing sheet tend to push the Roof Cladding downwards, the outward forces acting through the bottom side of the roofing sheet tend to lift the Roof Cladding from its frame. Outward forces could be generated by either negative wind pressures outside the building or positive wind pressure inside the building. Outward forces acting on roofing sheets through bottom side are most common and these forces must be balanced by providing right spacing between the Purlins (Figure 1 on page 10) and by selection of right diameter, length and number of fasteners. In cyclonic areas, extra care must be taken in designing and installation of roofs by consulting architects or professional shed fabricators.

RECOMMENDED SPACING BETWEEN PURLINS FOR DIFFERENT WIND ZONES*
SPACINGS BETWEEN PURLINS (mm) THICKNESS OF SHEETS (mm) ROOF SLOPE Wind Zone I
1090 1070 1230 1220 1320 1310 1400 1380 1480 1460 1550 1530 1620 1600 1650 1640 1860 1850 2090 2000 2230 2130

Wind Zone II
1090 1070 1230 1220 1320 1310 1400 1380 1480 1460 1550 1530 1620 1600 1650 1640 1860 1850 2090 2000 2230 2130

Wind Zone III
1090 1070 1230 1220 1320 1310 1400 1380 1480 1460 1550 1530 1620 1600 1650 1600 1800 1740 1950 1880 2120 2050

Wind Zone IV
1090 1070 1230 1220 1320 1310 1400 1380 1460 1410 1500 1450 1550 1500 1580 1520 1720 1660 1860 1880 2000 1950

Wind Zone V
1090 1070 1230 1220 1290 1250 1350 1300 1200 1350 1440 1400 1480 1440 1510 1460 1650 1590 1780 1720 1930 1860

Wind Zone VI
1090 1070 1160 1120 1210 1170 1260 1220 1300 1270 1350 1330 1390 1350 1420 1370 1540 1490 1660 1610 1800 1740

0.30 0.35 0.40 0.45 0.50 0.55 0.60 0.63 0.80 1.00 1.25

1 in 3 1 in 4 1 in 3 1 in 4 1 in 3 1 in 4 1 in 3 1 in 4 1 in 3 1 in 4 1 in 3 1 in 4 1 in 3 1 in 4 1 in 3 1 in 4 1 in 3 1 in 4 1 in 3 1 in 4 1 in 3 1 in 4

* Calculations are based on basic principles of Structural Engineering in respect to Strength and Deflection.

8

WIND FORCES
WIND ZONES

WIND ZONE VI V IV III II I

BASIC WIND SPEED IN METRE/SECOND 55 50 47 44 39 33

COLOUR CODE

Source: United Nations Development Programme Website: www.undp.org

9

ROOF AND WALL CLADDING
While one of the most important roles of roofing is to fight the weather, they also have significant effects on the aesthetic, cost and durability of a building. In Roof Cladding, factors such as rainfall, wind speed, height of building and walking weight on roofs (arising out of maintenance) have considerable effect on design of roof slope, supporting structures and spacing between Purlins (Figure-1). Design parameters for Wall Cladding is simple and straightforward compared to Roof Cladding. The
Ridge-end Purlin

main consideration in the design is spacing between the supports, known as “Side Girt” (equivalent of Purlins used in Roof Cladding). Wind speed and thickness of sheets play major role in arriving at the spacing between Side Girt. Figure -1
Spacing between Side Girts Eave-end (Gutter-end) Side Girt Spacing between Purlins

SLOPE
Slope is a major component of roof design. In absence of adequate roof slope, there is danger of water accumulation, which can lead to leakage and reduced sheet life. Most commonly used roof slopes in India are 1 in 4 (14º) and 1 in 3 (18º) (Figure 2 & 3). However, various other slopes can be used depending upon the intensity of rainfall and wind force. In case of sinusoidal profiles, it is recommended that one should not go below slope of 1 in 12 (5º). It is important to use sealants at the end lap of sheets in case roof slope is below 5º. Figure -2
1 4 3

Figure -3
1

1 in 4 (14º)

1 in 3 (18º)
Note: Roof slopes with 1 in 3 and higher are prevalent in locations with high rainfall/snowfall

OVERHANG
Overhang in Roof Cladding is important from the angle of complete weather-proofing of the building. While “End Overhang” maintained at the “Eave End” (Gutter end) of the roof facilitates proper drainage of water without drenching the inside of building from its front, the “Side Overhang” makes sure the rain water does not enter the building from sides (Figure-4). Overhangs are recommended below as per good engineering practice.

END OVERHANG (x) 300 mm
Figure -4

SIDE OVERHANG (y) 100 mm

x

y

10

ROOF AND WALL CLADDING
JOINTS ON THE SHEETS
Joints on the roofing sheets, also known as 'Laps', are critical in fabrication of leakageproof roofs. Joints on the side of the roofing sheet (along sheet length) is known as “Side Lap” (Figure-5) while joint at the end of the sheet (along sheet width) is known as “End Lap” (Figure-6). Slope of the roof plays a major role in deciding the area of laps.

SIDE LAP OF SHEETS
FOR ROOF CLADDING 1½ CORRUGATIONS
Note: In areas of heavy rainfall, the laps at sides should be suitably increased..

FOR WALL CLADDING 1 CORRUGATION

Figure -5

END LAP OF SHEETS
ROOF SLOPE
1 in 3 (18º) 1 in 4 (14º)

FOR ROOF CLADDING 150 mm 200 mm

FOR WALL CLADDING 100 mm 100 mm

Note: For roof slopes lesser than 14º recommended end lap is 200 mm

4 E1 in SLOP FOR MM 200 3 E 1in SLOP FOR MM 150

END LAP EETS OF TWO SH

G. C. SHEET G.I. CRANK BOLT

MS RECTANGULAR TUBE PURLIN

Figure -6

11

ROOF AND WALL CLADDING
NUMBER OF SHEETS REQUIRED FOR VARIOUS LENGTH OF ROOFS
LENGTH OF ROOF (mm)
915 1525 3050 4575 6100 7625 9150 10675 12200 13725 15250 18300 21350 24400 27450 30500

NO.OF SHEETS REQUIRED FOR DIFFERENT WIDTHS OF SHEETS 800 mm
2 3 5 7 9 12 14 16 18 20 23 27 31 36 40 45

(feet)
3 5 10 15 20 25 30 35 40 45 50 60 70 80 90 100

840 mm
2 3 5 7 9 11 13 15 17 19 21 26 30 34 38 42

910 mm
2 2 4 6 8 10 12 14 16 18 20 23 27 31 35 39

1220 mm
1 2 3 5 6 7 9 10 11 13 14 17 20 22 25 28

CALCULATION OF NUMBER OF SHEETS REQUIRED FOR VARIOUS LENGTH AND WIDTH OF ROOFS:
L : Length of roof (in metre) W : Width of roof (in metre) LS : Length of GC sheet used (in metre) NL : Number of sheets required for a given length and width of roof, (fig.7) will be = NL X NW NW: Number of sheets required along the width of roof Total number of sheets required will be NL x NW (for a given length and width of roof, dimensions explained in Figure-7)

LENGTH (L)
W TH ID ) (W

Figure -7
NO. OF SHEETS ALONG LENGTH OF ROOF
NL = (L + 0.0875) / 1.1075 NL = (L + 0.0875) / 0.7975 NL = (L + 0.0875) / 0.7275 NL = (L + 0.0875) / 0.6875 NW = (W + 0.4) / LS - 0.2

WIDTH OF SHEET
1220 mm 910 mm 840 mm 800 mm

NO. OF SHEETS ALONG WIDTH OF ROOF

12

Note: (1.) End lap of 200 mm and Side lap of 112.5 mm considered to arrive at number of sheets across length of roof. (2.) Overhang of 300 mm at eave-end and 100 mm at ridge-end considered to arrive at number of sheets across width of roof.

SAVINGS UNLIMITED
ADVANTAGES OF TATA SHAKTEE WIDER (1220 MM) GC SHEET

Lesser number of sheets required: You will require lesser number of TATA Shaktee Wider GC Sheets as compared to other narrow widths of GC sheets available in the market in order to cover a given roof size. Fewer joints required: Lesser number of roofing sheets mean fewer overlaps which reduces wastage of steel at side overlappings. Less number of overlappings ensure substantial cost savings. Fewer seepage points: Lesser number of joints mean fewer holes need to be drilled to fix TATA Shaktee Wider GC Sheets, resulting in lower number of seepage points on the roof and enhanced sheet life. Fewer accessories required: Fewer holes in fixing TATA Shaktee Wider GC Sheets reduce requirement of fasteners and substantially resulting in cost savings. Greater savings: All the above benefits result in unlimited monetary savings.

SAVINGS FROM TATA SHAKTEE WIDER (1220 MM) GC SHEET
LENGTH OF ROOF (mm)
915 1525 3050 4575 6100 7625 9150 10675 12200 13725 15250 18300 21350 24400 27450 30500

(feet)
3 5 10 15 20 25 30 35 40 45 50 60 70 80 90 100

NO. OF SHEET NO. OF SHEET REQD. FROM REQD. FROM 840MM WIDE GC 1220MM WIDE GC
2 3 5 7 9 11 13 15 17 19 21 26 30 34 38 42 1 2 3 5 6 7 9 10 11 13 14 17 20 22 25 28

NO.OF OVERLAPPING SAVED
1 1 2 2 3 4 4 5 6 6 7 9 10 12 13 14

13

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
G. I. NUT RUBBER WASHER G. I. FLAT WASHER RUBBER WASHER

TYPES OF HOOKS/SCREWS

J HOOK
G. I. HOOK BOLT

G. I. COACH SCREW SQUARE HEAD G. I. CRANK BOLT

Figure -8

Figure -9

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.

14

ACCESSORIES
USAGE OF RUBBER WASHER RUBBER WASHER NEW AFTER FEW YEARS BITUMEN WASHER NEW AFTER FEW YEARS

Usage of rubber washer enhances sheet life. The rubber washer does not absorb water or moisture and thus prevents the sheet from rusting.

Usage of bitumen washer, commonly used with J hooks, retains water/moisture that leads to rusting that begin at the joints and spreads to the sheet reducing sheet life.

USAGE OF GALVANISED FASTENERS GALVANISED J HOOK AND WASHER NEW AFTER FEW YEARS
ALUMINIUM PAINTED J HOOK AND WASHER

NEW

AFTER FEW YEARS

Usage of galvanised J hook, washer and nut enhances sheet life by preventing corrosion at the joints.

Usage of aluminium painted J hook, washer and nut that looks similar to galvanised accessories lead to rusting. This begins at the joints and spreads to the entire sheet, reducing sheet life.

LIFE COMPARISON OF FASTENERS USED WITH RUBBER AND BITUMEN WASHERS FASTENER WITH RUBBER WASHER NEW AFTER FEW YEARS FASTENER WITH BITUMEN WASHER NEW AFTER FEW YEARS

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.

15

ACCESSORIES
SELF DRILLING SCREWS
Recent developments in the field of cladding fasteners have promoted usage of self-drilling screws designed to provide exceptional corrosion resistance and weather proofing. These screws confirm to international standards such as DIN, ASTM, AS and as the name implies, they are directly screwed through sheets onto the purlin with the help of a drill machine. Identification of these screws is depicted below.( Figure - 10) EPDM WASHER (these washer are co-polymers, consisting of ethylene, propylene with proportion of diene and they offer extended life with best weatherproofing characteristics under extreme climatic condition) SCREW GAUGE (gauge of a screw is determined by the basic of the thread outside diameter)

THREAD PITCH (thread pitch is the number of thread crests counted along a linear measurement of one inch) IDENTIFICATION CODES of self-drilling screws is as follows:

12
Figure -10 Screw Gauge (Thread outside diameter)

-

14
Thread Pitch (threads per inch)

X

25
Overall length of the screw measured from under the head (mm)

FLASHINGS & RIDGES
Flashings are made from strips of galvanised metal in order to provide the essential weatherproofing at the edges of the cladding apart from making the finished job look neat. Flashings, depending upon their placement over the cladding, could be either longitudinal or transverse. Longitudinal Flashings run parallel to the valleys (Figure: 12) and are made to suit the profile of the sheets. During installation, one must turn down their edge towards the valley in order to achieve best weather protection. Transverse Flashings, also know as Ridges, run perpendicular to the valleys. In order to achieve maximum weather-proofing, the bent edge of the Ridge must sit onto the profile of the sheet (Figure: 13).

Figure -12

Figure -13

16

ACCESSORIES
ROOF DRAINAGE & GUTTERS
Drainage of water from the roof is extremely important in order to achieve complete weather-proofing of the building. A well designed water collection system, through set of Gutters and Drain Pipes at eave-end, not only protect property and building but also helps in water harvesting.

Gutters (Figure-14), made out of galvanized metal strips, are installed with a generous slope to avoid water accumulation. To be on safer side, Gutters should have a slope steeper than 1 in 500.Typically, slope on house gutters is maintained at 1 in 250. Design of Gutters and Drain Pipes is based on rainfall intensities (mm/hour) for a given territory along with water receiving area of the roof. “Total Water Receiving area of Roof - TWRR” can be calculated from the plan of the structure. To allow for the slope of the roof, increase the plan area by 1% for every degree of increase in slope up to 40 degree. For a given rainfall intensity and cross sectional area of Gutter, “Total Water Receiving area of a single Drain Pipe (TWRD)” can be calculated from the graph below. The diameter of Drain Pipes considered in the graph is 100 mm. The required number of 100 mm diameter Drain Pipes can be arrived by dividing TWRR by TWRD. An example calculating the required numbers of Drain Pipes is indicated in Figure-15. An illustrative example of Drain Pipe arrangement along with high points of water drainage is indicated below (Figure-16). Figure -14
Gutter Gutter Purlin Roofing Sheet

50mm

100 90

Water Receiving area for each Drain Pipe (m2)

Example for calculating number of Drain Pipes required:
50

Drain Pipe 1

High Point

70 60

0 15
50 40 30 20 10 0
3000 4000 5000 6000 7000 8000
2

0 20

3 00

400 500
Rainfall intensity (mm/hour)

High Point

SOLUTION: 1) For the given rainfall intensity and Gutter area, TWRD for a single drain pipe is 2 equal to 75 m (see red dotted line in the graph on left) 2) Number of Drain Pipes required will be = TWRR / TWRD = 750 / 75 = 10 Drain Pipes

Drain Pipe 5

Drain Pipe 4

Drain Pipe 3

9000

10000 11000 12000

Cross-sectional area of gutter (mm ), For Gutter Slope > 1 in 500

Figure -15
Source: National Plumbing and Drainage Standards, Australia AS 3500.3.2:1998

Figure -16

Drain Pipe 2
High Point

80

DATA GIVEN: Rainfall intensity =100mm/h Gutter area = 7500mm2 Drain Pipe diameter = 100 mm 2 TWRR = 750 m

10

0

17

GUIDELINES FOR INSTALLATION
FOR ROOFING n Check flatness, slope and overhang of the frame on which the sheets are to be laid. Please remember that any correction in the frame required after laying the sheets will be difficult and at times impossible to rectify.

n

Before lifting the sheets on to the roof, check if they are right side up. Place bundle of sheets over and near the firm supports and not at the mid-span of roof members. Sheets are normally laid from left to right commencing at Eaves, explained in figure-17 with sheets being numbered in order of fixing.

n

n

n

The first sheet is laid at the Eaves, right angled (90 degrees) to the purlin with a side lap of one and a half corrugation.

n

The minimum free overhang at Eaves must not exceed 300 mm. Care should be taken to ensure a minimum overhang of 100 mm at the side of the sheets. Ensure that the roofing sheets overhang minimum 50 mm into the Gutter at eave-end.

n

It is generally considered good practice to use fasteners along side-laps of sheets. To be on safer side, do not fix fasteners less than 25 mm from the end of the sheets. Maximum pitch between two fasteners, across the width of the sheet, should be 375 mm.

n

n

While laying the first sheet at left of eave-end, please ensure that it is correctly located in relation to other parts of the building such as end and/or side-wall.

n

Check alignment of sheets at repeated intervals. It is important to keep the gutter-end and ridge-end of all sheets in a straight line. This can be achieved by keeping the sheets parallel with respect to the first sheet.

n

One can either fix each sheet completely before laying the next or can fix the sheet sufficiently to ensure it can't move, complete laying all sheets at one row and then return to place all intermediate fasteners.

18

GUIDELINES FOR INSTALLATION

RIDGE-END

RIDGE PURLIN

7

8

9

10

11

12

PURLIN EAVES PURLIN

1

2

3

4

5

6

OVERHANG AT EAVES 300 mm

EAVE-END (Gutter-end) OVERHANG AT SIDES 100 mm

Figure -17

n

In Roof Cladding, for maximum water-tightness, fastening screws through the crest of the sheets on to the purlin is highly recommended (Figure 5 , Page 11). Always drive screws perpendicular to the sheet and at the centre of the corrugation. Placing screws on valleys may be susceptible to leakage in Roof Cladding.

n

The sheets on the next row are fixed similarly making an end lap (joint along the length of the sheet Figure 6, Page 11) of minimum 150 mm.

n

For Roof Cladding, allow a minimum end-lap of 200 mm for slopes of 5 to 14 degree, and 150 mm for slopes above 14 degree. For walls, allow minimum end lap of 100 mm.

n

For slopes below 1 in 4 it is recommended to use sealant at the end lap with a minimum 3 mm bead of natural cure sillicon sealant along the centre line of the fastener hole.

n

Where four sheets meet at their corners, the total thickness becomes very thick. This gives a hump at the corners. To provide neat fit to the sheets at this junction any two corners of the diagonally opposite sheets have to be cut (mitred). Mitring means cutting of corners of the sheets to the measurement of side lap and end lap of the sheets.

19

GUIDELINES FOR INSTALLATION n Care should be taken to ensure that the sheets do not butt against each other. The gap between each mitred corner should be approximately 2 mm. (The two diagonally mitred corners being covered by the uncut corners of the covering sheets will provide for perfect sealing against weather). Mitring should be done by carpenter's saw and sheets should never be chipped.

n

At the ridge end of roofing, wind can push water up under the ridge, into the building. In order to arrest this problem, valleys of the sheets are bent upward at the ridge-end of roofing (Figure-18). This process blocks the valleys at ridge-end thereby preventing water from entering the building through ridge-end. This process is highly useful in roofs with slopes below 1 in 2 (25°). In contrast, valleys at the eave-end of roofing sheet are bent down in order to achieve enhanced weatherproofness and smooth flow of water into the Gutters. Bending of sheets at valleys can be done with the help of multi-grip pliers or a sliding spanner.

Figure -18

FOR WALL CLADDING n In Wall Cladding fasteners are usually placed in the valley of the sheets since water penetration is not a problem in Wall Cladding. Fasteners at valleys are less noticeable and do not affect the aesthetic of the Steel Cladding. Also fasteners fixed on valleys of Wall Cladding minimize the risk of deformation of profile since the fastener rests flat against its support, i.e. Side Girt (Figure1, Page 10).

n

However, when valley-fixed, the cladding needs a side-lap fastener in all laps, in order to hold the profiles of two sheets together (Figure19, Page 21).

20

GUIDELINES FOR INSTALLATION

Figure -19

CONDENSATION & HEAT CONTROL
When the air in a building in contact with metal cladding is warmer than the cladding, moisture in the air can condense on the inside of cladding. Condensation can lead to deterioration of building components, staining of ceiling & walls and even deterioration of items stocked inside the stocking area. The amount of condensation depends upon the amount of moisture present in the air and this varies with climatic conditions. Activities within a building such as washing and drying of cloths, cooking, showering etc. may also add substantially to the amount of moisture in the air. In the event of extreme moisture content inside the building, it is essential to either keep cladding away from moist atmosphere inside the building or vent substantial amount of air moisture to the outside of the building. To minimize the risk of condensation on the inner-side of cladding a vapour barrier is often used to prevent contact of warm moist air with roofing. Reflective foil laminates are commonly used for this purpose. Such foils are also simple, inexpensive and very effective method to control heat. Additional heat insulation is often achieved by using bulk insulation blankets, which is a combination of reflective foil laminates, glass wool and wire mesh laid down on the frame before installing the coated sheets.

21

GENERAL CARE AND MAINTENANCE
Handling: For personal safety it is recommended to wear clean dry gloves while handling the sheets. Sliding of sheets over rough surfaces or over each other results in scratches and uprooting Zinc from the sheet surface.

Storage: Due to capillary action, moisture easily enters between the surfaces of stacked sheets. In areas of high humidity, wind takes them between the sheets. The trapped moisture between the sheets cannot evaporate easily leading to deterioration of the surface coating, a phenomenon known as White Rusting. This leads to reduced life of sheets and poor appearance. In areas of high humidity levels, it is advisable to have exhaust fans to reduce humidity level inside the sheet storage point. If the sheets are not required for immediate use, it should be stacked neatly and clear of the ground at covered space. It is advisable to protect them with waterproof covers. If stacked sheets become wet, separate it without delay, wipe it with a clean cloth or saw dust and stack it under sun till it dries thoroughly. Keep the stacked sheets as far as possible away from the non-compatible material as indicated in Table-1.

Marking, cutting and drilling during installation: Avoid usage of black pencils, i.e. lead pencils, to mark a galvanised surface as the graphite content can create an electric cell when wet and this may cause deterioration of the finish of surface. One can use coloured pencils or a fine felt-tipped marker.

For cutting thin metal sheets on site, it is recommended to use a hand or electric saw with a metal-cutting blade since it produces lesser damaging metal particles and burr on the sheets.

Holes on the sheets should be made by drilling. Use of punch in making holes should be avoided as it may not produce a clean cut hole and may even damage the profile of the sheet.

22

GENERAL CARE AND MAINTENANCE
Maintenance: Besides roof design and the environment, maintenance also plays an important role on the life of a roof or wall. Maintenance includes the following: n Preferably, washing should be done at least every six months and more frequently in coastal areas where moisture in atmosphere contains high level of salt.Washing of roof is also recommended in areas of high industrialization, which have higher content of oxides of sulphur, nitrogen and chloride salts along with humidity in the air.

n n n

Regular inspection of roofs and walls for problems before they become major corrosion sites. Removal of foreign particles such as leaves and debris from gutters and flashings. Keep Wall Claddings free of soil, concrete and debris near the ground.

Contact with incompatible material: To enhance life of galvanized steel sheets, it is important to note its compatibility with other commonly used material in construction. Contact with some non-compatible material and even water or moisture flowing from such material can adversely affect the life of the sheets.

TABLE- 1: LIST OF NON-COMPATIBLE MATERIALS
Limestone (commonly used in colouring the cement walls) Pesticides Wet and dry concrete Soils Lead Copper Uncoated steel Carbon (in pencils and some rubbers) Chemically treated wood or plywood Materials having excessive moisture content (Non-seasoned timber, bitumen sheets and washers)

Note: The list mentioned above is not exhaustive. In case of doubts on compatibility of other products being used with roofing sheets but not mentioned above, kindly seek advice from the manufacturer of Galvanised roofing sheets.

23

EDGE- AT A GLANCE
SI. GC SHEET ATTRIBUTES No. Hardness in Roofing Sheets TATA SHAKTEE GC SHEET ORDINARY GC SHEET

1

Accurate tempering resists cracks and fissures.

Uneven tempering causes cracks during installation.

2

Tensile Strength

High tensile strength resists external forces.

Low tensile strength results in damage and dents.

3

Zinc Adherence

Superior technology and process control leads to cleaner steel surface that enhances sheet life.

Inferior and outdated technology results in unclean steel surface leading to Zinc peel-off and reduced sheet life. Non-uniform Zinc coating causes parts of GC sheet to corrode faster.

4

Zinc Coating Technology

Uniform 120 gsm Zinc coating through 'Feed Forward X-Ray Coating Gauge' ensures even surface protection. Correctly printed thickness and Zinc coating on sheet assures true value for money.

5

Zinc Mass

Low Zinc coating, not verifiable through naked eye while buying new GC sheet, results in lower sheet life. Uneven corrugations lead to gaps in overlapping that ensures a badly fabricated roof and poor weather proofing.

6

Overlapping

Even corrugations ensure perfect overlapping that results in a neat roof structure.

7

Physical Dimension

Length of sheet equal or more than standard specified length.

Length of sheet lower than standard specified length.

8

Chromating

Usage of the best and adequate chromate solution prevents formation of white rust.

Inadequate chromate solution results in formation of white rust.

9

Thickness

Thickness of the sheet is equal to or more than the standard specified thickness printed on the sheet. Packaged with Blue Woven HDPE (450 microns) and LDPE (250 microns) plastic and shielded by the edge protector that preserves sheet quality. The Recommended Consumer Price (RCP)ensures that prices are uniform and transparent across the state. A network comprising 3500 dealers and 28 distributors ensures excellent and regular supply.

The thickness printed is very often incorrect and lower to the standard specified thickness. Ordinary sheets are packaged in a poor quality plastic that results in damage to sheets.

10

Packaging

11

Pricing

Pricing of ordinary GC sheets is oppurtunistic and unfair, which means that prices are unstable and prone to opportunism A poor distribution network in absence of distribution guidelines results in irregular supply of GC sheets.

12

Distribution Network

24

LIMITED Tata Centre 43 Jawaharlal Nehru Road Kolkata 700 071 Tel 91 33 2288 7051/ 1951 / 3061 Fax 91 33 2288 5926

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Tata Sky

...Ace Institute of Management MARKETING MANAGEMENT Case # 4: Tata Sky’s Marketing Strategies Submitted to: Mr. Ashish Tiwari Submitted by: Rupesh Kumar Shah EMBA ’11 Fall September 2012 Question 1: Examine the growth strategies of Tata Sky over the years. Answer: Tata Sky was launched in 2006. It is one of the leading India-based Direct To Home (DTH) service provider. It has crossed three million connections mark in a period of 20 months. Therefore, it is the fastest growing direct-to-home service provider across the globe. It is a joint venture between Tata Group with 80% stake and STAR Group with 20% stake. It currently offers more than 196 channels and few interactive ones; the count includes few numbers of HD channels offered by Tata Sky called as Tata Sky - HD and interactive services. Tata Sky has tied with Aamir Khan as its brand ambassador. Aamir Khan features all Tata Sky brand and product communication such as advertisements in TV, print and radio. Tata Sky has targeted to have about eight million connections by 2012. The direct-to-home (DTH) industry in India currently has about 30 million subscribers and six players. It is assumed to grow to 60 million subscribers by the end of 2013 despite the fact that the industry faces several issues such as low average revenue per user (ARPU), high cost of acquisition of content and subscribers, and various taxes such as entertainment...

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