Home > Materials Specifications

Pitched roof coverings Sheets, Comparison between A.C. sheets and G.I. sheets

Er. Parbhakar Dwivedi
0
 

       

The two varieties of commonly used sheets for pitched roof coverings are as follows:

(1) Asbestos cement sheets

(2) Galvanized iron sheets.

(1) Asbestos cement sheets: The cement is mixed with about 15 per Gent of asbestos fibres and the paste so formed is pressed under rollers with groves or teeth. Thus, sheets, commonly known as the A.C. sheets, with a series of waves or corrugations are formed and they are used for factories, workshops, garages, big halls, etc. The corrugations help to increase strength and rigidity and they permit the easy flow of rain water. They are available under different trade names and in standard sizes. They are cheap, fire-resisting, light in weight and sound-proof.

(2) Galvanized iron sheets: The galvanized iron sheets are prepared by pressing flat wrought-iron plates between rollers with grooves or teeth and then they are galvanized with a coat of zinc. These sheets are commonly known as the G.I. sheets. The process of galvanizing is named after the 18th century Italian scientist Galvanic and it has been perfected to highly sophisticated degree achieving improvement in quality, economy, productivity and labour savings. The use of computer controlled sophisticated modern equipment ensures a quality product with a uniform tightly adherent layer of zinc.

The corrugations help to increase strength and rigidity and they permit easy flow of rain water. They are available in lengths varying from 1.20 m to 3.60 m and in widths varying from 600 mm to 900 mm. The thickness varies from 0.18 mm to 1.60 mm. They are costly and do not offer resistance to fire and sound. The comparison between asbestos cement sheets and galvanized iron sheets.

Comparison between A.C. sheets and G.I. sheets

No. A.C. Sheets G.I. Sheets
1 Breakable and requires much care in handling Not breakable and can be handled with little care
2 Cannot be made as thin as G.I. sheets Sheets can be made very thin
3 Cheap in initial cost High in initial cost
4 Do not corrode Easily corroded by atmospheric actions
5 Fire-resisting Non-fire-resisting and deformed when a fire occurs
6 Heavy in weight Light in weight
7 Less noisy when something falls over them Noisy when something falls over them
8 Maintenance cost is practically nil, if not damaged Maintenance cost is more due to periodic painting to resist the corrosion
9 Neat and pleasing appearance can be achieved Appearance is not pleasing even if a neat finish is made
10 Not affected by acids and fumes Affected by acids and fumes
11 Not much affected by temperature Hot in summer and cold in winter
12 Possibility of getting damaged due to external causes Less possibility of getting damaged due to external causes
13 Prepared from a mixture of cement and asbestos fibres Prepared from wrought-iron plates and then galvanized
14 Sound-proof Not sound-proof

Sponsored

PD Consulting Engineers Pvt. Ltd. Transforming construction for a new generation "Cost, Quality & Project management"

QS & Cost management, Bill Checking / Audit, Technical Auditors, Valuation, Contract and Tendering, Project Management, Project Planning, Quality Control, Consulting Engineers, Structural Consultancy

Close


Comment:

Name:

Email:

Civil N Construction Blog



Relevant Topics

Binding Wire Consumption Finish Sizes Tolerances Tensile Wrapping Bend Test Permissible Defective

Tar Classification Of Tar

Reclaimed Rubber Advantages Disadvantages Uses Of Reclaimed Rubber

Comparison Between Asphalt Bitumen Tar

Compounding Of Rubber Compounds Used For Natural Synthetic Rubber

Pitched Roof Coverings Sheets Comparison Between Ac Gi Sheets

Uses Of Rubber Consumption Of Rubber For Various Items

Turpentine Properties Of Turpentine Uses

Properties Of Rubber

Rubber Types Of Rubber

Forms Of Rubber

Vulcanization Effects Of Vulcanization

Sound Absorbent Materials Classifications Materials Are Used For Sound Absorbent

Guidelines For Use Plastic Emulsions Paints

Types Of Paints

Painting On Different Surfaces Woodwork Metal Etc

Notes For Guidance In The Process Of Painting

Polyurethane Sealant

Precautions Taken In The Design Installation Of Pvc Pipes

Polysulphide Sealants

Preventive Measures For Corrosion

Structural Adhesives

Moulding Compounds Types

Advantages And Disadvantages Of Pvc Pipes

Bonding Agents Cement Based Slurries

Biodegradable Plastic Its Advantages Disadvantages

Adhesives Difference Between Sealant And Adhesive

Application Of Epoxy Adhesive

Non Structural Adhesives

Wall Paper Whitewashing Colourwashing

Defects In Painting

Ingredients Of A Distemper Process Of Distempering

Applications Of Frp In Building Industry

Classification Methods Of Polymerization

Distempering Properties Of Distempers

Properties Of Plastics

Processes Involved In The Fabrication Of Articles Of Plastics

Selection Of Material For Injection Grouting

Plastics Composition Of Plastic

Pvc Pipes In Buildings

Properties Of Frp Fibre Glass Reinforced Plastic

Materials Commonly Used as Sealants

Silicone Sealant

Classification Of Sealants

Types Of Varnishes Process Of Varnishing

Various Types Of Grouting Materials

Sealant Consistencies

Uses Of Plastics

Failure Of Paint

Desirable Properties Of Sealant

Bonding Agent Between Old And New Concrete

Varnishing Characteristics Of An Ideal Varnish Ingredients

Fibre Glass Reinforced Plastic Frp Principal Methods

Sealants Functions Of Sealants Procedure

Preventive Measures For Corrosion

Classification Of Sealants

Sealant Consistencies

Desirable Properties Of Sealant

Sealants Functions Of Sealants Procedure

Cold Twisted Deformed Bars Ctd Bars Disadvantages

Magnetic Properties Of Steel

Composition Of Cast Iron

Metals Categories Ferrous Metals

Market Forms Of Steel Steel Available In Market

Use Of Wrought Iron

Factors Influencing Corrosion

Corrosion Of ferrous Metals Non Ferrous Metals

Uses Of Cast Iron

Metal Corrosion Types Of Corrosion Effect Of Corrosion

Heat Treatment Processes Of Steel

Mechanical Treatment Of Steel

Precautions In Using Mortar

Defects In Steel

Pig Iron Manufacture Of Pig Iron

Prevention Of Corrosion Of Steel In Concrete

Forms Of Corrosion

Selection Of Mortar As Per Nature Of Work Type Of Mortar

Nature And Properties Of Metals

Ribbed Hysd Bars High Yielding Strength Deformed Bars

Defects In Wrought Iron

Types Of Pig Iron

Thermo Mechanically Treated Tmt Bars Why Prefer Tmt Over Hysd Bars

Causes Of Corrosion

Defects In Metal Casting

Properties Of Engineering Materials

Is Classification Of Lime

Rock Forming Minerals

Comparison Between Lime And Hydraulic Lime

Physical Properties Of Engineering Materials

Common Building Stones Of India

Uses Of Stones

Mechanical Properties Of Materials

Physical Classification Of Rocks

Classification Materials Based Upon Their Uses

Chemical Classification Of Rocks

Qualities Of Good Building Stone

Lime Classification Of Limes

Textures Of Structure Of A Rock

Classification Of Rocks

Factors Of Corrosion Of Reinforcement

Precautions While Using Epoxies

Physical And Mechanical Properties Of Polymer Modified Mortar Concrete

Special Materials For Repair

Essential Eequirements Of Repair Materials

Classification Of Polymeric Modifiers

Deleterious Effects Of Aggressive Chemicals

Causes Of Deterioration Of Concrete Structures

Application Of polymer Modified Mortar concrete Pmm Pmc In Repairs

Corrosion Of Reinforcement Explained

Advantages Of Using Epoxies As A Repair Material

Types Of Materials Available For Repair

Application Of epoxy Based Materials In Repairs

Gauge Type of Mechanical Gauges

Specifications for cement, Specifications for physical properties of Portland cement

Introduction of Cement, Types of cement

Construction Materials- Introduction, Classification of engineering material, Properties of Engineering Materials

Lift Design Important Factors Traffic Constraints

Classification Of Lifts Rope Hydraulic Lift

Water Requirements For Sprinkler Systems By pipe Schedule Hydraulic Method Calculation

Operating System Automatic Operation Full Selective Collective Duplex Collective

Spacing Area Of Coverage Of Sprinklers Maximum Minimum Distance Between Sprinkler

Lifts Types Of Lifts

Hydraulically Most Demanding Area

Water Requirement For Sprinkler System

Types Of Systems Of Sprinklers

Traffic Analysis For Lift Positioning Occupancy Calculation Of Time Factor

Hydraulic Elevators

Essential Components Of Lifts Elevators Brakes Hoisting Rope Motor Counter Weights

Power Control Ac Resistance Control Variable Frequency Drive

Classification Of Occupancies Firefighting

Important Definition For Sprinkler Firefighting

Classification Of Lift According To Interiors

Pump Capacity Water Storage Requirement

Sprinkler Types Upright Pendant Sidewall System

Piping Of Sprinkler System

Important Points Related To Pipe Selection Laying

Selection On Temperature Rating

Automatic Sprinkler System

Dimensional Structural Requirements For Lift Tolerance Allowed In Structure

---NNNNNNNNNNNNNNNNNNNNNN

Basic Principles Of Water Supply Drainage And Sanitation

Water Supply Requirements For Buildings

Protection Of Water Supply

Estimate Of Demand Load Of Water Supply

Design Of Distribution Systems Of Water Supply

Water Supply Materials Fittings And Appliances

Colour Codes For Different Types Of Water Pipes

Important Water Supply Related Definitions

Consideration For Design Of Water Supply

Water Supply Fixture Units (wsfu) For Ifferent Fixtures With Minimum Pipe sizes

Storage Of Water

Water Sources And Quality

Maximum Flow Rate And Flush Volumes

Sponsored

PD Consulting Engineers Pvt. Ltd. Transforming construction for a new generation "Cost, Quality & Project management"

QS & Cost management, Bill Checking / Audit, Technical Auditors, Valuation, Contract and Tendering, Project Management, Project Planning, Quality Control, Consulting Engineers, Structural Consultancy

Close