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How to choose corrugated board for the roof?

When choosing a roofing material for private houses, summer cottages and other buildings, more and more owners are opting for corrugated sheeting. This material, consisting of metal sheets with a corrugated surface, is in great demand. Its popularity is due to its affordable price, ease of installation, light weight and wide range of colours. In addition, corrugated sheeting is known for its strength and durability.

Types of metal profiles for roofing

Metal profiles are a popular roofing material due to their reliability and durability. There are several types of corrugated sheeting used for roofing, each with its own characteristics and purpose:

Galvanised corrugated sheeting with or without a coating. This type of profile is made of galvanised steel, which can be additionally coated or uncoated. The polymer coating provides additional protection against corrosion and allows you to choose the colour of the corrugated board in accordance with the architectural design. The absence of a coating does not reduce the strength of the material, but it is advisable to use a protective layer for durability.

Roofing corrugated board. This type of profile includes a variety of options: bent, rolled, perforated and textured. Bent and rolled sheets ensure the reliability and strength of the roof structure, while perforated and embossed profiles add an aesthetic appearance and can perform decorative functions.

Corrugated sheeting is often seen as an alternative to metal tiles and other roofing materials due to its cost-effectiveness and ease of installation. All types of corrugated board are made of galvanised steel, which ensures their resistance to corrosion. A polymer or paint coating provides additional protection and extends the life of the roof.

What corrugated roofing is made of

Corrugated roofing is made from materials that combine reliability, durability and corrosion resistance. The basis for the production of corrugated board is galvanised steel sheets, which are highly resistant to through corrosion. This material ensures a long service life of the roof, preserving its technical and aesthetic properties for many years.

Corrugated sheeting is produced using specialised equipment - fully automated profile bending mills. During the production process, steel sheets are passed through the bending mills, where corrugations of the required height and configuration are formed by longitudinal rolling. The corrugation not only gives the corrugated board an aesthetic appearance, but also provides it with additional strength and resistance to external loads.

To choose the optimal corrugated sheet for the roof of a house, production hall or shop, you should pay attention to versions with a profile height of 20 to 60 mm. Such corrugated sheeting is able to withstand significant wind loads as well as the weight of the snow layer, which is especially important in harsh climates.

Advantages of corrugated board

Corrugated sheeting is one of the most popular roofing materials due to its numerous advantages, which make it an ideal choice for finishing buildings of any configuration and size:

High strength. Corrugated sheeting is made of steel of considerable thickness, and the high corrugation gives it additional rigidity. This ensures long-term operation of the material without the risk of deformation or damage.

Affordable price. Compared to other roofing materials, corrugated sheeting offers an optimal price-performance ratio, making it a cost-effective roofing solution.

Lightness. Corrugated sheeting is lightweight, which minimises the load on the floors and foundation of the building. This is important, especially when renovating old buildings or building lightweight structures.

Resistance to external influences. The material can withstand precipitation, wind, ultraviolet rays and mechanical stress. High-quality galvanised coating and polyester layer provide corrosion protection and prevent external damage.

Easy to install. The corrugated board is easily installed on a metal crate and fixed with special screws with a rubber gasket. The absence of complicated locking joints allows you to cover even large areas quickly and efficiently, which significantly reduces installation time.

These advantages make corrugated board an ideal choice for those looking for a reliable, durable and cost-effective roofing material.

Marking of corrugated board for roofing

The corrugated sheeting used for roofing has a clear marking that helps to identify its main characteristics and application. In modern construction, load-bearing (N) and universal (U) corrugated sheets are most commonly used.

Load-bearing corrugated board (N). This type of corrugated sheeting is distinguished by its pronounced ribbing and the presence of additional stiffeners. Due to these features, load-bearing corrugated sheeting is highly durable and can withstand significant loads, making it an ideal choice for covering the roofs of large buildings.

Universal corrugated sheeting (US). This type of corrugated sheeting has a low profile height and moderate load-bearing capacity. Universal corrugated sheeting is used not only for roofing but also for walling, where not only strength but also the material's appearance plays an important role. It is suitable for covering buildings with a small footprint and for creating roofs with a large pitch.

Due to its functionality and aesthetics, corrugated sheeting with the H and NS markings is a popular choice among developers for various types of roofing.

Corrugated sheet lengths for roofing

The optimal length of corrugated sheeting for roofing is between 3 and 7 metres. Although modern production makes it possible to produce sheets of any length within reason, it is not recommended to purchase corrugated sheets 12 metres long. The reason for this lies in the physical properties of the metal, in particular its linear expansion.

When the temperature changes, the metal expands when it is warm and contracts when it is cold. For sheets up to 7 metres long, these changes are almost imperceptible, but for sheets longer than 10 metres, the difference can be up to 5 mm. This can lead to negative consequences for the roof.

The corrugated board is attached to the crate with self-tapping screws, which requires drilling the sheet, which compromises its integrity. When the temperature drops sharply, the metal surface area will begin to shrink, which can lead to tears at the attachment points. This will not only worsen the aesthetic appearance of the roof, but also affect its quality and durability.

Therefore, when choosing the length of corrugated sheeting for a roof, you should opt for the optimal 3-7 metres to ensure the reliability and stability of the roof covering.

Thickness of the corrugated sheet for the roof

The choice of corrugated sheet thickness for roofing is an important aspect that affects the durability and reliability of the coating. Corrugated sheeting with a thickness of 0.35 mm, which is usually used for fencing or facade cladding, is not suitable for roofing. Such a thin material will not be able to withstand the loads on the roof, especially during strong winds or snowfall.

The optimum thickness of corrugated sheeting for roofing is from 0.5 to 0.7 mm. In cases where the roof is exposed to particularly harsh operating conditions, for example, in regions with a harsh climate, it is recommended to use corrugated sheets with a thickness of up to 1 mm. It is worth remembering that as the thickness of the material increases, its cost also increases, so it is important to strike a balance between expediency and budget.

Thus, choosing the optimal thickness of corrugated sheeting for the roof will ensure reliable protection of the building and durability of the roof.

Types of protective coating

Corrugated roofing sheets need to be protected from external influences, and various types of protective coatings are used for this purpose. Let's look at the main types of coatings available for purchase, their advantages and disadvantages.

Galvanised coating. The galvanised coating is applied by hot-dip galvanising during production. This is a traditional option that provides effective anti-corrosion protection. The zinc layer creates a barrier that prevents water penetration and rust formation. Galvanised corrugated sheeting is affordable and is often used to cover the roofs of outbuildings, garages and sheds. However, it has a limited service life compared to other coatings.

Polymer coating. Polymer coatings provide not only protection but also a decorative look. They can be made of different materials, each of which has its own characteristics:

Acrylic coating - Although this coating looks attractive, its durability is limited. Acrylic requires regular tinting to maintain its aesthetic appearance.

Plastisol - It has a significant thickness of up to 200 microns, which provides high strength. However, plastisol is prone to rapid fading under the influence of sunlight.

Polyester - Applied in a thin layer of 25-30 microns and can be either glossy or matte. The main disadvantages are low resistance to abrasion and mechanical damage, as well as limited anti-corrosion ability.

Pural - This coating has high wear resistance, does not fade or scratch. The thickness of the protective layer reaches 50 microns, which makes it durable and effective in protecting against external influences.

Polyvinylidene fluoride (PVC) - Fluoroplastic coating is the most durable of the polymer options. It does not degrade under the influence of ultraviolet rays, resists mechanical damage and adverse weather conditions. A wide range of colour options adds to the aesthetic appeal. However, this coating is more expensive.

The type of coating you choose depends on your specific needs, budget, and durability and appearance requirements. Depending on your project, you can choose the most suitable option that will provide reliable protection and aesthetic appearance of your coating.

General guidelines for choosing corrugated roofing

When choosing corrugated roofing, it is important to consider several key factors to ensure the durability and efficiency of your roof. Here are the main points to consider:

Roof design and climatic conditions: The choice of corrugated sheeting should be based on the structural features of your roof and the climatic conditions of your region. For example, for roofs with a lower pitch or in areas with high precipitation, it is better to choose a corrugated board with a high load-bearing capacity. This will help to avoid problems with drainage and ensure the reliability of the coating.

Metal thickness: Metal thickness is a critical parameter. The optimal thickness is 0.5 mm. This thickness provides sufficient strength to withstand wind and snow loads and ensures the durability of the material.

Profile height (corrugations): The height of the profile affects the rigidity of the corrugated board. Additional stiffeners increase the performance of the material. The lower the pitch of the roof, the higher the profile height must be to ensure the required stiffness.

Sheet length: The length of the corrugated sheet also matters. Choose a length that minimises the number of joints and reduces the likelihood of leaks.

Type of coating: Corrugated board can be coated with different materials such as polyester, pural or plastisol. The choice of coating affects corrosion resistance and the appearance of the roof. It is recommended to choose a coating with high resistance to external influences.

Material weight: The weight of the corrugated board can affect the load on the roof structure. Make sure that the weight of the material meets the requirements of your roof structure.

Cost: The price of corrugated board varies depending on its characteristics. It is important to find the best value for money to ensure the durability and functionality of the roof.

Certificates and guarantees: Make sure that the corrugated board has the appropriate quality certificates and warranty from the manufacturer. This ensures that the material is up to standard and durable.

Visual inspection: Before purchasing, carefully inspect the corrugated board for defects such as dents, scratches, chips or peeling paint. It's also important to check whether the sheet restores its original shape after moderate bending.

Choosing the right corrugated sheet will help ensure the reliability and durability of your roof, as well as reduce maintenance and repair costs in the future.

Bottom line

Choosing the right corrugated sheet for your roof is a key step in ensuring the durability and functionality of your roof. Don't forget to do a thorough visual inspection and check quality certificates.

Investing in quality material at the outset will give you peace of mind and reduce maintenance costs in the future. Choosing the right corrugated board is not only a matter of aesthetics, but also of the practicality and durability of your roof.

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