Benefits of Integrating Daylighting Systems with Metal Panels

Brighten Up Spaces by Perfecting Daylights!

LYSAGHT® Roofing offers architecturally pleasing lighting control solutions
Do you wish to enhance your morale? Experience lesser fatigue? Or even improve your mood? If yes, your search for an ideal ambience ends here! Appropriate light signals during the day and darkness at night are crucial in managing key aspects of our overall health, mood and productivity. Daylighting has been interrelated with enhanced morale, improved mood, less fatigue and reduced eyestrain.

Before we dwell any further, let us see what is ‘Daylighting’ in architecture?
Daylighting is the controlled admission of natural, direct or diffused sunlight inside a building to reduce electric lighting and saving energy. As the need for sustainable design grows, daylighting has become extremely critical in reducing the impact of a built environment. Effective daylighting creates comfortable and visually stimulating environment while improving the energy efficiency of the building; making it a sustainable solution.

Versatility of Daylighting
Daylight solutions can be integrated into a variety of metal roof – flat, curved or pitched. They are found in a diverse range of buildings such as commercial centers, sports complexes, industrial facilities, warehouses or agricultural structures. Manufacturers provide a varied range of daylighting options like skylights, wall-lights, windows, light tubes, mirrors, and other reflective surfaces to direct light into the working space. All these daylighting options have different design capabilities and degrees of performance.

Did you know?
One can reduce artificial lighting by upto 70% which may account for 30-50% of building’s total energy consumption!

Skylights are a design favorite. They act as light diffusing agents installed alongside the roof. Major types of skylights used with steel roofing panels are Polycarbonate sheet and Fiber Reinforced Plastic sheets (FRP). These sheets are available in various shapes and types like opaque, transparent, translucent and diffused. Skylights ensure impact and temperature resistance along with light transmission. They can be manufactured in standard and non-standard sizes ensuring compatibility with metal roofing sheets

If you are looking for a perfect partner who could seamlessly integrate skylights with metal sheets; LYSAGHT® Roof and Wall Cladding Solutions by Tata BlueScope Steel should be your obvious choice. LYSAGHT® roof and wall cladding profiles are compatible with skylight and wall-light sheets in standard and non- standard offerings as per customer requirement. With expert installation processes and a skilled task force, we ensure standard installation practices for lapping roof and skylight panel joints to enhance weather tightness of the complete roofing system.

Right from design and detailing to supply and installation; LYSAGHT® team of experts ensure you have a hassle-free experience while building your structure. Do visit our website for further clarification or get in touch with our experts by calling 18002708333

Designing Roofs for Low Maintenance, Cost Optimization and Error Proofing

What’s the difference between a good roofing design and a bad one? If you see from functionality point of view, a “bad” roof design will show results in no time. It would require extensive maintenance, it may falter on finishes and can show signs of leakages within months of roof completion. A ‘bad’ roof design will have poor conformity to building regulations, codes, resistance to external forces or even in-adequate insulation, making it energy inefficient. Between constant repairs and increased energy costs, you’ll land up spending your money maintaining the roof, then you did on its initial construction.

Roof systems are most critical investment not only due to their cost but also because of the valuable assets they protect in the long-term. Especially in an industrial or a manufacturing set-up where frequent maintenance can mar operational efficiency thereby affecting delivery targets.

While architects or structural designers are ready to embrace complex designs, the need for perfection is imperative right from the first design draft. With notable improvements in design technology and manufacturing processes; complex and unusual designs of metal roofs have become widely accepted.

Necessary conduits of design engineering:

No-one wishes to design a bad roof. However certain considerations should not be neglected:

  • Ensure a close understanding between a highly professional design team and the contractor to help optimize roof design, while minimizing errors during actual execution.
  • To address critical engineering challenges, use modern-day software. With precision, it helps develop robust, well-engineered and high-performance designs.
  • Safety too plays a significant part. Adding safety features like walk-ways, access platforms, safety nets etc. would minimize on-site fatalities and maintenance.
  • Use accessories that perfectly complement finishes for improving overall functionality.
  • Necessary arrangements for equipments such as wires, down-pipes for water harvesting, HVAC equipments, solar panel should be considered.

The above factors when combined, enables you to build roofing system that have long life and require minimum maintenance over the time. Accordingly, the role of engineering becomes very crucial in capital intensive industrial roofing!

Reinforce your Roof Design with LYSAGHT® Engineering

At LYSAGHT® we work with you to ensure that your roof designs are safe, optimized and as per required design codes. LYSAGHT’s in-house engineering provides Design Solutions for a large gamut of applications – Roof & Wall Cladding, Purlins & Girts, Composite Decking and Solar Module Mounting Solutions.

Our Engineering team is trained on the latest know-how of Indian and International codes and practices that match both market and customer needs. We constantly upgrade our technology with support from BlueScope R&D Team. We take help from prestigious institutions such as IIT-M for vetting our designs for further improvements as and when required. In addition to that, we conduct tests for our products to suit Indian conditions at IITs and NABL approved labs in India to give complete assurance to our esteemed customers. We use Global Engineering software like STAAD Pro, MBS, Autocad, Tekla and some of our proprietary software like MEGAFLOOR for Composite Slab and SUPRACAD for LGFS Solutions.

We extend Structural Warranty Certificates to Designs like Solar MMS. Engineering team is also capable of addressing all types of site issues, on time solutions, site measurements in case of re-roofing jobs or retrofitting jobs and roof diagnoses. Engineering expertise coupled with industry wide best design & manufacturing ability makes our services highly customer centric. LYSAGHT® solutions always endeavour to complete on-time delivery of projects which in turn optimises cost for our customers.

Use of global engineering software, adherence to international standards and codes, state of the art manufacturing capabilities, quality testing practices ensures error proofing in our 360◦ customer focused solution.

To ensure you get the best value for your money; do visit our website for more information.

Advantages of an Insulated Metal Roof System

They say beauty is more than skin deep. This is true, especially while you consider a building or a structure. The most basic requirement of any building is to keep the external elements – heat, rain, cold and noise out; while keeping comfortable conditions in, for the building occupants. Advances in manufacturing processes, materials and technologies have transformed the way we keep our inside temperatures as conducive as possible. Thanks to Insulated Metal Roof Systems!

To ensure better thermal performance and sound control inside a building, Insulated Metal Roof System plays a vital role. To avoid energy losses and minimize expense on other equipments to cool the inside premise, we need to create our buildings as energy-efficient as possible.

So, if you are a far-sighted person, Insulated Metal Roof System will be your perfect choice!

Insulated Metal Roof System enables better performance of the structure and enhances experience for people working under it. This system can go a long way in providing long term benefits.

What is Insulated Metal Roof System?
This type of metal roof system helps in reducing the overall heat transfer coefficient by adding materials with low thermal conductivity. It also maintains an ambient temperature in the building and works as a barrier to heat loss and gain.

Let us see some of the advantages of an Insulated Metal Roof System:

  • Heat Prevention: In summers, insulated roof works on minimizing the heat transfer between inside and outside of the building.
  • Heat Retention: Locations with lower temperatures where heating structures is unavoidable, insulation works best to prevail warmth inside the premise.
  • Energy Efficiency: A well-insulated roof helps save on energy consumption by improving energy efficiency, comfort, and living standards in both modern commercial as well as Industrial buildings.
  • Acoustic Control: Insulation acts as an infill between two metal sheets. It not only reduces heat transmission but also external sounds such as thunder, rain, hail etc. noise from entering the building envelope through the roof.

There are two types of insulations predominantly used in an Insulated Metal Roofing System:

  • Glass Wool Insulation:Glass wool is made from recycled glass or sand, soda ash and limestone.
  • Rock Wool Insulation: The rock wool is made from basalt, volcanic rock, and an increased proportion of material that is recycled in the form of briquettes.
Note: In Insulated Metal Roofing System, insulation can withstand temperature upto 400o C, offering an incredibly high thermal performance. Higher the insulation thickness, better is the thermal conductivity.

However, for a well-insulated metal roofing system, you need a trustworthy partner. Fortunately LYSAGHT® roof and wall cladding solutions from Tata BlueScope Steel can help you install your new fully insulated roof.

About LYSAGHT® Insulated Metal Roof System
LYSAGHT® profiles can be used in Single Skin and Double Skin Insulated Roof systems. LYSAGHT® roof and wall systems provide superior energy efficiency combined with aesthetics for your next project. LYSAGHT® recommends Roll Insulation for Single Skin roof and Both Slab and Roll Insulation for Double Skin Roof.

LYSAGHT® Insulated Metal Roofing Systems’ advantages:

  1. Performs better for environment control during fire, smoke emission and toxic emissions
  2. It is suitable for all types of buildings
  3. Insulation thickness can be customized as per requirement
  4. Different insulation solution is provided depending upon local weather conditions
  5. Foil laminates are also available to reflect heat and provide vapor barrier

Illustrations of some of our offerings:

Choose your type of metal roof insulation system today! At Tata BlueScope Steel, we can help you choose the right one. To get started with a roofing installation or replacement, visit us at

How Green is Your Roof?

Enhance your structure’s green rating by adopting sustainable roofing

If one of your aspirations is to make your structure more sustainable, this information will help you understand how you can make a difference by adopting eco-friendly roofing solutions.

These days, using sustainable building materials is critical in new building design considerations and construction. With growing concerns over climate change there is a conscious effort to move towards ecologically safer solutions.

Sustainable construction means using renewable and recyclable materials when building new structures, as well as reducing energy consumption and waste.

Architects and designers are always looking for aesthetically superior, environmentally friendly products and solutions to help create efficient, long lasting and sustainable buildings.

Let us see few demands within architectural community while choosing their building material:

  • Recyclability is a number one priority and demand for materials that eliminate environmental impact is on the rise
  • Energy Efficiency with smaller carbon footprint, is yet another sought after properties while choosing a roof.
  • Maintenance Free structure with longevity and durability that promises greater performance in adverse climatic conditions is pertinent in today’s unpredictable environmental conditions.

Steel roofing and wall cladding by LYSAGHT® from Tata BlueScope Steel are a great solution for people who want to practice conscious sustainability. With a robust sustainability policy, dedicated to both – managing operations responsibly and continuous improvement, Tata BlueScope Steel is committed to design and manufacture of sustainable products and solutions, that are lighter, last longer and use few resources to produce them.

LYSAGHT® Roofs make the best sustainable solution:

a. Recyclability: This could be well reiterated with their products made from 100% COLORBOND® steel and ZINCALUME® steel that are environment friendly as they can be recycled and are reusable conforming to the sustainability quotient stipulated by GreenPro certification.

b. Paint technology: The paint system of COLORBOND® steel does not contain any heavy metal like lead, chromium, cadmium, etc. making it environment friendly. Instead, it uses stable resin & inorganic pigments for paint durability which are sustainable in nature.

c. Water harvesting: The design of deep ribs on LYSAGHT® roofs and accessories used, make the roofing system compatible for water harvesting.

d. Light weight of steel: Reduces the overall weight of the structure, ensuring less carbon footprints. No welding or wastage during construction; hence no damage to local flora and fauna.

e. Integration with solar roof panels: All our profiles are compatible with roof mounted solar applications.

f. Cool Comfort: LYSAGHT® profile made from COLORBOND® steel is backed by energy efficient Thermatech® technology that enhances the thermal performance (Higher Solar Reflectance value (SRI)) of the roof. In moderate to hot climates, compared to roofing materials of similar color with low solar reflectance, COLORBOND® steel with Thermatech® can reduce annual cooling and energy consumption by up to 15%.

g. Cost and Energy savings: All profiles offer extruded type of skylight for daylight saving. Extruded profiles ensure less leakages enhancing skilled workmanship. In addition, accessories like louvers, turbo vents, ridge vents ensure smooth air-flow which reduces overall energy consumption.

LYSAGHT® products are used in most progressive segments of India’s infrastructural, manufacturing, warehousing and commercial applications contributing to the green requirements of the project.

If you wish to fulfil your dream of a sustainable structure; do get in touch by writing to us.

Creating Stunning Architecture with Curved Roof & Wall Cladding

Embracing contemporary designs through modern architecture, architects today are experimenting with curved metal roofs and wall cladding solutions; breaking away from the traditional, simpler and mundane panels. Not only it helps them to incorporate exciting elements such as tapered and convex shapes in their designs, but it also transforms their vision into reality!

Shapes possible with Tata BlueScope Steel’s LYSAGHT FLEXLOK® Profile

Creativity in architecture stems from possibilities enabled by its building material. In recent times coated steel roofs have grown as design favorites, giving wings to your imagination, due to its innate strength and flexibility. From tapered, curved and excellent spanning capabilities, to an all-pervasive weather ability; color coated steel roofs are the new-age solutions for space extensions, bigger interior spaces, high clearances, larger spans with seamless columns. Combined with unique angles, eclectic hues, increased edge finishes, appealing gutter options and more, architects now have access to a greater assortment.

Advantages of a Metal Curved Roofs

Optimize Spaces: For a complete visual delight, Architects and designers are replacing typical squared, vertical buildings with curved walls and undulating roofs for an optimized space.

Enhanced Aesthetics with Practicality: Curved roof structures have become a popular trend over recent years, providing aesthetic appeal and the practical advantages of lower apex heights and parapet requirements.

Better Strength: Curved roofs are entirely made of metal as it offers strength and flexibility to be bent or manufactured in a curved shape.

Low on Maintenance: Roofs made from steel are wind and corrosion resistant and promise longer life.

Sustainable Alternative: Made from 100% recyclable and reusable steel, the roofs are environmentally friendly, thermally efficient and installed with lean and safe construction practices.

Modern age Commercial, industrial and infrastructural buildings like malls, modern warehouses, airports, metro stations, educational institutions, etc. are being built with the objective of high aesthetical appeal, giving rise to new trends in roof designs and modern architecture.

We at Tata BlueScope Steel, through LYSAGHT® roof and wall cladding solutions; partner with some of India’s best-known architects, who inspire the construction fraternity with their out-of-box thinking.

LYSAGHT® profiles such as TRIMDEK®, FLEX-LOK ®, KLIP-LOK® and CUSTOM ORB® can be angled, sliced, tapered or curved and are a designer’s delight. The profiles can be crimped curved on-site or in factory as per customers’ requirement.

BASF, Chennai – A fine example of aesthetics with durability

Kolkata Metro

Chennai Metro

Seeking pure customization and liberating your freedom of thought, these profiles accentuate your signature styled architectural creations with a modern-day streak. Leaving your mark for generations to come

In addition to roofing profiles, LYSAGHT® offers a complete 360 built experience. From state of art manufacturing of world’s finest products to design & engineering services, safe and advanced construction capabilities; LYSAGHT® team of experts are known for their complex project handling!

Do get in touch with us for your next roofing project by sending an email to or simply explore our range of solutions by clicking the link:

Screw-down Profiles – An Effective and Economical Roofing Solution

As you start building your next project, the first thing that probably comes to your mind is what kind of roof you want. If you’ve chosen a metal roof, sifting through different metal roofing options can be challenging and overwhelming. However there are two most preferred metal roof types: screw down metal roofs and standing seam, or “exposed fastener” metal roofs. The exact choice will depend on several factors such as budget, build-speed requirement, impact load, lifespan, aesthetics, environment, application etc. This article will focus on screw-down profiles and their benefits as an economical and effective solution; which will also help you take an informed decision.

What is screw-down profile?
Screw-down metal roofing is essentially a corrugated metal roof held together with many exposed screws that clasp the roof in place. It is one of the most basic forms of metal roofing you’ll find in the market, and is particularly common over warehouses, railways and metro stations, manufacturing plants, infra and industrial establishments.

Advantages of Screw-Down Metal Roofs:

  • Firstly, Screw-down roofing is one of the simplest forms of roofing available.
  • Secondly, it is quick and easy to install as the roof is simply fastened to the frame with screws, which cuts down on installation time, offering a relatively straightforward installation process.
  • It is excellent for withstanding high wind load, snow load or impact load i.e. foot traffic, enabling ease of maintenance.

With the right kind of accessories, especially designed SDS class 3 screws with black EPDM washers, correct installation practices, regular maintenance; one can achieve long-term performance!

Being pioneers in color coating steel industry and manufacturers of its allied products, Tata BlueScope Steel has mastered the art of crafting precision-oriented roofing solutions with an array of screw-down profiles to choose from including: TRIMDEK®1015, BR II™ 900, SPANDEK® 935, CUSTOM ORB® 990, VARYDEK® 1000 and Tile profiles. All profiles offer compatible accessories which are made from superior material with higher corrosion resistance and greater thermal efficiency.

LYSAGHT® screw down profiles are specially designed to provide anti capillary groove to ensure water-tightness for leak-proof roof performance. Best-in-class accessories offer greater performance and corrosion resistance. Our design and technical experts ensure proper installation methods to optimize overall roof performance, ultimately delivering value to our customers.

So what are you waiting for? Contact LYSAGHT® expert today, for a free counselling session to get best offers on screw-down profiles.

You may send your queries to or visit the company website for more information.

Kolkata Metro adorned with LYSAGHT TRIMDEK® Profile

Valpoi Bus Stop, Goa in a scintillating LYSAGHT SPANDEK® 935 Profile

MRF Manufacturing, Trichy with LYSAGHT TRIMDEK®

A Practical Guide for Installing a Long-Lasting Roof

Roofing expense may contribute to about 3% of your overall expenditure but protects the remaining 97%!

Yes, the way you install your roof, lays the groundwork for your structure’s entire future. If installed under expert guidance, it lives longer; if not it may lead to a pre-mature failure! A roof gives protection against all weathers, makes your structure energy efficient, gives comfort while contributing to the overall aesthetics. As the life of any structure depends on its roof – if installed properly it not only enhances beauty, but also helps it to last longer with less maintenance, as compared to poorly installed roofs, thus saving cost in the long term.

Let us see some of the best practices for roof installation:

Before embarking on execution, always think of Safety first

  • Prepare for the assembly in advance.
  • Understand the structural drawings
  • Use safety harness, personal protective equipment’s and smooth sole shoes


  • Cut materials on ground than on any other material where hot particles can fall and cause damage to the finishing of sheets
  • Remove all the drill particles, scraps, excess fasteners and pop rivet mandrels from roof to avoid rusting and stains.
  • Power saw along with metal cutting blades should be used for thin sheets

  • The roof screws should always be placed through the ribs and wall screws should be fixed through pan.
  • Use recommended screws/ fasteners of class 3 with EPDM rubber sealing washers
  • The air gap towards the left makes sure that water does not travel upward, the groove should be on the inner side.
  • Structures like HSS angles, channels and tubes (apart from the zinc coated supporting structure) should always be painted prior to fixing the sheets.
  • Use neutral cure silicone rubber sealants.
  • Wash the roof with clean water or mild detergent by using soft cloth, mop or soft nylon bristles to avoid swarf stains and rusts.

  • Screws should be fixed directly on the supporting members.
  • While walking on the roof, keep your weight evenly distributed
  • Guard film must be removed after installation


  • Don’t keep colour coated sheets in contact with cement, dirt and chemicals like paint or thinner
  • Don’t install the roof sheets during rains, sheets get wet and slippery
  • Do not use J hooks, carbon washers and stainless-steel screws on the sheets as they might cause damage to the sheets.

  • Don’t overdrive or under drive the screw as it leads to water leakage and washer damage.
  • Improper contact at the groove portion makes the roofs vulnerable to water leakages, the groove portion should not be on the outer side.

  • Don’t leave metal articles on the roof
  • Don’t throw bird feed on the sheet, bird dropping can damage the colour of the sheet.
  • Don’t use acetic acid-based sealants which liberate aggressive by-products during curing
  • Never use abrasive or solvent type cleaners, wire brushes, steel wool, sponge, scorers to clean the roof sheets as it softens the paint film
  • Avoid walking on the end lap gutters, single rib and skylight sheets.

While no roof will last forever, you can improve the odds by insisting on installation that observes the best practices along with the authenticity of the manufacturer. It is extremely important to hire a qualified professional who understands one’s requirement and does the job flawlessly.

Tata BlueScope Steel is your roofing expert with years of experience when it comes to supply of superior quality roofing solutions and best-in-class installation practices within the construction industry. You can view a full range of Roofing and Wall Cladding Products, Solutions & Services on the company website.

7 Crucial Signs to Believe You Need a New Roof

A stitch in time saves nine is a common phrase, used to say that it is better to fix a problem when it is small, than to wait for it to become bigger than you can handle!

This stands true for the roofing woes we face when early signs of a damaged roof are ignored. A roof is the first line of defence for all external adversities. It becomes crucial to pay attention towards its wear and tear. It is imperative to observe the early signs of damage and address them well in time to avoid costly repairs that may occur in the future.

Here is an easy guide to know when your roof needs a doctor:

1. Age of roof
Aging of roof is a natural process which can be caused due to various reasons like Pollution, extreme weather conditions etc. Irrespective of the appearance, it is always important to keep a tap of the age of roof. Roofs which are considerably old should be considered for re-maintenance or replacement with better quality materials. One should get the roof inspected by a professional to ascertain the requirement of any maintenance.

2. Deterioration of paint
If the paintwork of the roof gets visibly degraded, it is one of the first signs that the roof either needs maintenance, replacement or might just need to be repainted. Peeling and flaking of the paint may happen either on the outer surface or the inner surface of the roof. Ensuring that the roof paint is in good condition may just add on to better aesthetics as well as increased life of the roof.

3. Damage through water
A good and well-maintained roof is designed to withstand any weather condition be it heavy rains, summers or winters. If there is a leakage, one can see signs of seepage through the structure. In such cases it is important to ascertain the actual reason behind the leakage, increased moisture inside the roof or any other water damage on the roof and get the same either repaired or changed.

4. Corrosion and rusting
Corrosion is a natural process wherein the metal gets oxidized, in case the roof sheets are not properly maintained it may result in faster rate of corrosion of the roofing sheets. Corrosion is also the sign that water could be gathering in the supporting structures and gutters. Timely maintenance of roof may result in slowing down the corrosion process. If the roof is substantially corroded it is suggested to replace the roof structure with a new one.

5. Holes and cracks in the roof
It is very crucial that the roof should be replaced if one observes cracks, bending or holes in the roof as these may cause long term damage to the structure like dampness, peeling of paints, water leakage, moulds etc.

6. Damages in supporting structures
Any damage in the supporting structures of the roof like purlins, flashings etc. is a clear sign that the roof may be compromised. It is important to repair the roof or replace the same in such cases to avoid any major cost at later stages

Any roof must undergo maintenances within regular intervals. All the above points should be kept in mind while inspecting the roof and the decision should be taken on whether the roof needs to be replaced or there is a need of any maintenance work. It is always suggested to get the same inspected through professionals.

If you’re a home owner and your roof is showing signs of age, Tata BlueScope Steel has the perfect knowledge and experience to restore your roof to its original glory. You can purchase a range of roofing solutions from our award-winning roofing brand DURASHINE®. Guided by a team of professionals that specialize in steel roofing, you can rest be assured of complete peace of mind while collaborating with us!

To find out more about our products and services, contact us/visit website/fill form and we will get back soon to help you!

Choosing the correct Purlin for Roof framing

While designing any new roof or renovating existing roof, it is important to check all technical parameters to attain perfection. A well-designed roof is an ideal solution to safeguard us from extreme weather conditions and all-natural calamities.

Being the most essential part of any industrial building, roofing is a vital component which needs to be maintained with stability and carried appropriately. In the current trend most of the Metal Buildings are designed with shallow roof slope to get safe and economical building solution. When the roof slope is shallow, there is a negative pressure that develops on the roof which tries to uplift the roof panels.

By choosing the right purlin spacing with a right roof profile, stability in roof is achievable.

What are Purlins?
Purlin is a structural secondary member which forms the skeleton of the Metal Building. Purlins are the longitudinal horizontal members connecting the rafters along the length of the building. The structural support of every building is made up of purlins.

What are the main functions of Purlins?

  • Transferring the wind loads to the main frame, rafters and columns. Thus providing structural stability to the main frames by connecting them all along the building.
  • Supporting the Roof System i.e. the enclosure of the building.
  • Purlins are the structural load carrying members. The wind forces acting on the End Walls of the building get transferred by purlins to the main frame members and to the foundation, by means of bracings.
  • Purlins also supports roof system, and are designed to take care of wind load acting on the roof, Live Load, Dead load of Sheeting or roofing and collateral loads like Ventilation duct load, sprinklers, lightings etc.

Thus, Purlins are an important component of the building.

What are the different types of Purlins?
Raw Material wise two types of Purlins are there

  • Hot rolled Purlin
  • Cold Rolled Purlin

Based on the Shapes

  • Circular – pipes / tubes (Hot rolled)
  • Square and Rectangular hollow sections (Hot Rolled)
  • ZEE, ZED and CEE shaped purlins (Cold formed)

Today, Metal Buildings have evolved with design technology called Pre-Engineered Buildings (PEB), with clear span of 90 mtr. Purlins used in these PEBs are of either ZEE or ZED shaped Cold formed members having the min yield strength of 300 MPa. These ZEE or ZED Purlins are of min 1.2mm thickness to maximum 3.15 mm steel thickness. These are generally roll formed from Pre-Galvanized sheets having the zinc coating mass of min 120 GSM to the maximum of 275 GSM.

Factors considered while designing Purlin
While designing any structural member, we need to find the load acting on that member. To determine the load, complete building parameters like Width, Length, Height, Roof Slope and Wind Speed of the building should be considered.

    1. Loads acting on the Purlin

    Dead Load of roofing systems are self-weight of the roof sheet, Solar modules, roof platforms, ventilators, walkways etc.

    Live Load on the roofing system

    Wind Load which are external in nature

    Collateral loads are the hanging loads from the Purlin

    2. Support type

    Second important factor is the support type, whether it is supported as a Single Span or Continuous Span by Overlapping the purlins. CEE members are generally used as a simply ‘supported Purlin’ and ZEE or ZED purlins as a continuous span as we can overlap the purlins.

    3. Span of the Purlin

    Third important factor is the Span of the Purlin, that is the Bay Spacing or Rafter to Rafter spacing. Based on the span, Strength and Deflection of purlin will be determined.

    Purlin is designed basis the roof system. For example, if Screw down system is put on top of the Purlin then the screw down profiles provides the Diaphragm which provides bracing strength to Purlins. In case standing seam, profiles are fixed on top of Purlin and then the purlins need to be checked for Lateral Torsional Buckling apart from its bending moment and deflection checks.

    Cold formed design codes must be used while designing cold formed purlins.

    4. Selection of the Purlin type and Design Optimization

    Cold formed ZEE Shaped purlins are most economical solutions nowadays as compared to Hot rolled ISMC channels and other HR pipe purlins. HR Purlins are higher in weights (kg/m). Also, they cannot be overlapped hence need to be designed as a Simply supported section which limits optimization. Whereas Cold formed ZEE purlins are slim and available in the thickness range of 1.2mm to 3.15mm, and can be overlapped for different lengths, resulting in designing of most optimized purlin sections. On an average 30% to 50% weight savings can be achieved using Cold formed ZEE Purlins.

    5. Purlin Finish

    Cold formed Purlins are roll formed from pre-galvanized Coils with Zn coating mass of minimum 120 GSM to the maximum of 275 GSM. If the environment is controlled and away from coastal and chemical industries like ware houses, small manufacturing units, factories without any generation of chemicals then 120 GSM coating is enough.

    For the other chemical and costal environment minimum coating mass of 275 GSM is required. For severe corrosive environments, we can further increase the coating mass of zinc or can apply any anti corrosive paints on the purlins. Alternatively, Purlins can be sealed with false ceiling materials as well.

LYSAGHT® high strength light-weight recyclable purlins – CEE-plus™, ZEE-plus™ & ZED-plus™ provide economy to the building construction and also helps in keeping the site clean and environment friendly.

LYSAGHT® CEE-plus™, ZEE-plus™ & ZED-plus™ sections are accurately roll-formed from high strength zinc-coated steel, pre-punched to the required dimensions to provide an efficient, lightweight, economical purlin and girts.

LYSAGHT® profiles made of COLORBOND® and ZINCALUME® steel manufactured and supplied by Tata BlueScope Steel are suitable for roof, wall support and portal framing up to a certain span. The system, which includes bridging and a comprehensive range of accessories, is supplied as ready for erect.

What are the different type of Steel roofing sheets available in India

A roof to a home is one of the most important aspects. Since the designing of a house has been ever evolving over the years, the roof has evolved as well. The roofing material that originally started by being made using clay later evolved to shingles, which has been a widely popular roofing material in India and over the world. Due to the limitations of roofing shingles, people started looking for an alternative roofing solution to add a protective covering with better aesthetics and durability to their homes which resulted in steel roofing sheets coming into the picture.

Steel roofing sheets are a strong solution to all the roofing problems you face when designing a home or commercial space for yourself. Steel roofs are liked due to the various advantages that are attached to them. Steel roofing sheets are favored for their fire and water-resistant qualities, luster, longevity and durability and they are quick to install when done by a professional. This roofing solution is lightweight and reflects the sun, which helps reduce the room temperature and helps the homeowner save on electricity bills too!

While deciding on steel roofing sheets for your home, you should be aware of the different types of steel roofing sheets available in the market. The properties attached to these different sheets and what is best for you as per your requirements. Below is a list of different types of roofing sheets available, their basic characteristics, materials used and their making process for you to understand and choose the most ideal roofing solution for your home.

Types of steel Roofing roofing sheets:

  1. Galvanized corrugated sheets (GC sheets) : The most basic of the steel roofing sheets is the galvanized corrugated sheets. These sheets are created using steel as the base and a layer of Zinc is created above the inner steel layer which gives an added protection to the steel. Zinc helps slow down the corrosion process of the sheet and helps extend the life of sheets. One of the most common forms of steel roofing solutions, Galvanized corrugated sheets or GC sheets are a quick and economical roofing solution for any establishment. The corrugated pattern on the sheets helps in quick and easy installation of the sheets and also helps avoid leakage. When on a budget, GC sheets are the most ideal steel roofing solution for you.

  2. Galvalume or Zinc-aluminum coated steel sheets: The Galvalume steel sheets or Zinc-aluminum coated steel sheets are an advanced steel roofing solution to the GC sheets. Unlike the GC sheets, the GL sheets have a layer of Aluminium and Zinc on top of the base steel roof. It has an alloy coating of 43.5 % Zinc (Zn), 55% Aluminium (Al) and 1.5 % Silicon.

    Zinc coating protects steel by way of sacrificial protection. Aluminium protects steel by way of barrier protection and since Zn-Al coating contains both Zinc and Aluminium, it provide both sacrificial & barrier protection to steel. Zn-Al coating contains also provides improved performance against chipping and other external damages

    Aluminium as a metal has properties that provide better corrosion resistance as compared to other metals. Its also helps give the steel roofing sheet a cleaner and more uniformed appearance.

    For same thickness of coating, Zinc-Aluminium alloy coating imparts corrosion resistance of up to four times the life of Galvanized steel.

  3. Pre-painted galvanized iron (PPGI) sheets: Pre-painted steel sheets have a metallic coating and a paint coating over the base metal. The PPGI sheets have a Zinc coated or galvanized substrate, conversion coating, and suitable combinations of primer & paint coats on both the surfaces. PPGI refers to factory pre-painted steel roofing sheets, where the steel is painted before forming, as opposed to post painting which occurs after forming. Pre-painted steel sheets are generally referred to as colour coated steel sheets.

  4. Pre-painted galvalume or Zinc Aluminum Sheets (PPGL) : Pre-painted galvalume sheets or Zinc Aluminum coated Sheets, is the painted version of Galvalume steel sheets.

    The PPGL sheets have a Zinc- aluminum alloy substrate, conversion coating, and suitable combinations of primer & paint coats on both the surfaces.

    The paint layer over the metallic coating provides an additional layer of protection and adds to the aesthetics of the steel roofing sheets. The paint coating also improves the thermal efficiency of these steel sheets

    These steel sheets exhibit better solar reflectivity and hence helps to maintain the internal temperature of the buildings in which it is used.

When deciding on steel roofs for you home, you can choose from a variety of patterns such as steel sheets, steel liners, steel tiles or even wall cladding solution which can be installed in various sized establishments. A steel roof has various advantages attached to it can be a very long-lasting and beautiful solution for your home.

DURASHINE® is the flagship retail brand of Tata BlueScope Steel, which offers colour coated profile sheets in form of roof and wall solutions. These steel roofing sheets are manufactured from high strength pre-painted and Zinc –aluminum alloy coated steel exhibiting greater corrosion resistance, wider spanning capabilities with better uplift performance. DURASHINE® offers aesthetically superior and durable roofing solutions for residential, commercial and industrial applications.