What are the uses of color coated coils?

Construction technique

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In structural engineering, a pre-engineered building (PEB) is designed by a PEB supplier or PEB manufacturer with a single design to be fabricated using various materials and methods to satisfy a wide range of structural and aesthetic design requirements. This is contrasted with a building built to a design that was created specifically for that building. Within some geographic industry sectors pre-engineered buildings are also called pre-engineered metal buildings (PEMB) or, as is becoming increasingly common due to the reduced amount of pre-engineering involved in custom computer-aided designs, simply engineered metal buildings (EMB).

During the 1960s, standardized engineering designs for buildings were first marketed as PEBs.[1] Historically, the primary framing structure of a pre-engineered building is an assembly of I-shaped members, often referred to as I-beams. In pre-engineered buildings, the I beams used are usually formed by welding together steel plates to form the I section. The I beams are then field-assembled (e.g. bolted connections) to form the entire frame of the pre-engineered building. Some manufacturers taper the framing members (varying in web depth) according to the local loading effects. Larger plate dimensions are used in areas of higher load effects.

Other forms of primary framing can include trusses, mill sections rather than three-plate welded, castellated beams, etc. The choice of economic form can vary depending on factors such as local capabilities (e.g. manufacturing, transportation, construction) and variations in material vs. labour costs.

Typically, primary frames are 2D type frames (i.e. may be analyzed using two-dimensional techniques). Advances in computer-aided design technology, materials and manufacturing capabilities have assisted a growth in alternate forms of pre-engineered building such as the tension fabric building and more sophisticated analysis (e.g. three-dimensional) as is required by some building codes.[2]

Cold formed Z- and C-shaped members may be used as secondary structural elements to fasten and support the external cladding.

Roll-formed profiled steel sheet, wood, tensioned fabric, precast concrete, masonry block, glass curtainwall or other materials may be used for the external cladding of the building.

In order to accurately design a pre-engineered building, engineers consider the clear span between bearing points, bay spacing, roof slope, live loads, dead loads, collateral loads, wind uplift, deflection criteria, internal crane system and maximum practical size and weight of fabricated members. Historically, pre-engineered building manufacturers have developed pre-calculated tables for different structural elements in order to allow designers to select the most efficient I beams size for their projects. However, the table selection procedures are becoming rare with the evolution in computer-aided custom designs.

While pre-engineered buildings can be adapted to suit a wide variety of structural applications, the greatest economy will be realized when utilising standard details. An efficiently designed pre-engineered building can be lighter than the conventional steel buildings by up to 30%. Lighter weight equates to less steel and a potential price savings in structural framework.

Project professionals and manufacturer-designed buildings

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The project architect, sometimes called the Architect of Record, is typically responsible for aspects such as aesthetic, dimensional, occupant comfort and fire safety. When a pre-engineered building is selected for a project, the architect accepts conditions inherent in the manufacturer's product offerings for aspects such as materials, colours, structural form, dimensional modularity, etc. Despite the existence of the manufacturer's standard assembly details, the architect remains responsible to ensure that the manufacturer's product and assembly is consistent with the building code requirements (e.g. continuity of air/vapour retarders, insulation, rain screen; size and location of exits; fire rated assemblies) and occupant/owner expectations.

Many jurisdictions recognize the distinction between the project engineer, sometimes called the Engineer of Record, and the manufacturer's employee or subcontract engineer, sometimes called a specialty engineer. The principal differences between these two entities on a project are the limits of commercial obligation, professional responsibility and liability.

The structural Engineer of Record is responsible to specify the design parameters for the project (e.g. materials, loads, design standards, service limits) and to ensure that the element and assembly designs by others are consistent in the global context of the finished building.

The specialty engineer is responsible to design only those elements which the manufacturer is commercially obligated to supply (e.g. by contract) and to communicate the assembly procedures, design assumptions and responses, to the extent that the design relies on or affects work by others, to the Engineer of Record – usually described in the manufacturer's erection drawings and assembly manuals. The manufacturer produces an engineered product but does not typically provide engineering services to the project.

In the context described, the Architect and Engineer of Record are the designers of the building and bear ultimate responsibility for the performance of the completed work. A buyer should be aware of the project professional distinctions when developing the project plan.

These prefabricated structures are widely used in the residential as well as industrial sector [3] for its unmatched characteristics.

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Colour-coated coils and sheets are widely used pre-engineered building materials. It is a versatile product used for various applications, including home appliances, furniture, airports, industrial, and warehouses.

Colour-coated steel sheets and coils use steel coils as substrates and are coated with various organic coatings. These pre Coloured steel sheets and coils are manufactured by the top structural steel company, APL Apollo Tubes. It also offers excellent electro-resistance as a high-quality PEBsteel structure solution.

The colour-coated steel coils are produced as pre-painted steel sheets and then cut to size and marketed as the finished products. The sheet’s colour comes from the steel colour-coated coils. Pre-painted steel coils are predominantly used to improve the aesthetic value of PEB structures. Apart from this, it offers other advantages such as durability and corrosion resistance.

Several companies that manufacture steel also produce colour-coated products. It is confusing to buy the best colour-coated products. This blog will share the factors to consider when purchasing colour-coated structural steel sheets.

How to Choose Color-coated Coils and Sheets from the market?
The construction material will not only meet your expectation but also reduce the purchasing costs. Consider the following factors when choosing pre-painted steel products:

Measure Coating Thickness

Whenever buying colour-coated sheets, it is important to check the coating thickness of the product. Substrate and coating thickness may vary depending on the application, use environment, and durability. The thickness of the coating will increase its durability and prolong its life.

Must be Hot-Dipped Galvanized Sheets

Before finalizing the structural steel coil/tubes, one major thing to consider is whether it is a galvanized sheet or a galvalume sheet. Manufacturers of color-coated sheets use hot-dip galvanized and galvalume sheets for their superior corrosion resistance. Its mechanical properties make Galvalume sheets suitable for industrial projects in highly corrosive environments.

Types and Colors of top/back paint

PE(polyethylene), SMP (mix of Silicon & Polyester), HDP, and PVDF are four popular top paints that differ in hardness, adhesion, durability, and other qualities. The most often coating used is PE which offers average durability, decent hardness and flexibility, and is available at a reasonable price. SMP is better than HMP because it is durable, glossy, and colour-retaining. However, it is less flexible. HDP is more durable than PE and also less expensive. PVDF has outstanding durability and flexibility, but it is less colourful and more expensive. The top coat should follow these factors such as the use purpose, the environment, the designed life, durability, processing method, etc. to prolong the life of the PEB steel sheets.

Back paint is often chosen based on the application and use environment. When the environment is not corrosive, one layer of paint is sufficient. The back paint must adhere well if it is pasted with thermal insulation materials.

Buy by Weight Rather than Per Piece

To construct their pre-Engineered steel building, you should purchase steel priced by weight rather than per piece. When working on large metal projects, precise weight calculation is crucial to reducing the weight economically and physically. Knowing the weight of steel sheets is essential if you plan to transport or lift them with cranes or hydraulic equipment.

In Summary!
Hopefully, the list of factors will help you to buy suitable colour-coated sheets from the market. APL Apollo is one of the leading structural steel manufacturers in India, with years of expertise in the structural steel sector. We offer safe and efficient structural steel tubes and pipes structures at reasonable pricing by leveraging our experience and cutting-edge technologies. To check out the entire range of APL Apollo structural steel products, please visit www.aplapollo.com and we will be happy to serve you.

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