A roofing panel and roofing system

Abstract

This utility model discloses a roofing panel and a roofing system. The roofing panel includes: a main body; two connecting parts connected to both sides of the main body along a first direction and symmetrically inclined relative to the main body; two first rolled edges connected parallel to the two ends of the connecting parts that are far apart from each other, each having a first bending structure; and a second rolled edge connected to the end of one of the first rolled edges that is far away from the connecting part, each having a second bending structure. The second rolled edge can be bent at a first angle to cover the first rolled edge, and cause the first rolled edge to bend at a second angle, thereby connecting the two roofing panels. Adjacent roofing panels can be connected by the first and second rolled edges curling together. This ensures that the edges of both the first and second rolled edges are covered internally, greatly improving the sealing and waterproofing performance.

Description

Technical Field

[0001] This utility model relates to the field of construction, and in particular to a roofing panel and a roofing system. Background Technology

[0002] Metal roofing panels are a widely used material in the construction industry, primarily for roofing or wall covering. Compared to traditional materials such as tiles or concrete, metal roofing panels are much lighter, reducing structural requirements. They also withstand harsh weather conditions such as strong winds, rain, and snow, and have excellent fire resistance. Many metal roofing panels are recyclable, contributing to sustainable development. Therefore, metal roofing panels have a wide range of applications. However, in existing roofing systems, fixing metal roofing panels often requires mechanical interlocking or clamps. Mechanical interlocking requires drilling holes for fasteners, which not only damages the roofing panels and easily leads to leaks, but also results in numerous holes, making it very difficult to locate leaks and leading to extremely high maintenance costs. Clamp fixing is often more expensive, has a complex installation process, and carries the risk of clamp damage, resulting in very high maintenance costs. Utility Model Content

[0003] This disclosure provides a roofing panel assembly and a roofing panel system thereof to solve or alleviate one or more technical problems in the prior art.

[0004] To solve the above-mentioned technical problems, this utility model provides a roofing panel, which includes: a main body, two connecting parts connected to both sides of the main body along a first direction and symmetrically inclined relative to the main body; two first rolled edges connected in parallel to the two ends of the two connecting parts that are far apart from each other, and having a first bending structure; and a second rolled edge connected to one end of one of the first rolled edges that is far away from the connecting part, and having a second bending structure; wherein the second rolled edge can be bent at a first angle to cover the first rolled edge, and drive the first rolled edge to bend at a second angle, so that the two roofing panels are connected to each other.

[0005] In one feasible implementation, the first angle is the same as the angle of the second bend, and the second angle is the same as the angle of the first bend structure.

[0006] In one feasible implementation, the first angle is 90° and the second angle is 90°.

[0007] In one feasible implementation, the portion of the connecting part that connects to the main body has an inclination angle greater than 90° and less than 180°.

[0008] In one feasible implementation, the connecting portion has a third bending structure, the sum of the angle of the third bending structure and the angle of the tilt angle being greater than 270°.

[0009] In one feasible implementation, the roofing panel includes a waterproof layer and a metal layer in sequence along the thickness direction, wherein the waterproof layer is a thermoplastic polyolefin waterproof membrane or a polyvinyl chloride waterproof membrane.

[0010] In one feasible implementation, the thickness of the roofing panel is 1.8mm-2.4mm.

[0011] In one feasible implementation, the thickness of the waterproof layer is 1.2mm-1.8mm, and the thickness of the metal layer is 0.6mm-1.2mm.

[0012] In one feasible implementation, the roofing panel further includes an anti-corrosion layer disposed on the side of the metal layer away from the waterproof layer.

[0013] Accordingly, a roofing system is also provided, comprising at least two roofing panels as described in any of the preceding claims, wherein adjacent roofing panels are connected by a first rolled edge and a second rolled edge.

[0014] Implementing this utility model has the following beneficial effects:

[0015] The roofing panels provided in this application embodiment can be connected to adjacent roofing panels by curling a first rolled edge and a second rolled edge together. The second rolled edge is essentially an extension of the first rolled edge. The second rolled edge first bends to cover the first rolled edge, and then the first rolled edge bends to cover the edge of the second rolled edge as well. This ensures that the edges of both the first and second rolled edges are covered internally, greatly improving the sealing and waterproofing performance. Furthermore, no fasteners or drilling are required for connection, and no additional clamps are needed. This does not compromise the waterproofing performance of the roofing panels. The assembled roofing panels also exhibit good tightness, improving their wind uplift resistance and enhancing the overlap rigidity and waterproofing functionality.

[0016] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0017] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application, and do not constitute an undue limitation of this application.

[0018] Figure 1 This is an exemplary structural cross-sectional schematic diagram of a roofing panel provided in some embodiments of this application;

[0019] Figure 2 yes Figure 1 A magnified view of part A in the image;

[0020] Figure 3 This is a schematic diagram illustrating the process of connecting and fixing two adjacent roof panels to each other, provided in some embodiments of this application.

[0021] Figure 4 yes Figure 3 An enlarged schematic diagram of 4a in the diagram;

[0022] Figure 5 This is a schematic diagram of the roof panel connection portion of a roofing system provided in some embodiments of this application;

[0023] Figure 6 yes Figure 5 A magnified view of part B in the image.

[0024] The reference numerals in the figure:

[0025] 100 - Roofing panel; 110 - Main body; 120 - Connecting part; 121 - Third bending structure; 130 - First rolled edge; 131 - First side; 132 - Second side; 140 - Second rolled edge; 141 - Third side; 142 - Fourth side; 101 - Waterproof layer; 102 - Metal layer; 103 - Anti-corrosion layer. Detailed Implementation

[0026] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0027] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0028] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0029] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0030] In the description of this utility model, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0031] Please refer to Figures 1 to 6 This application provides a roofing panel 100. The roofing panel 100 includes: a main body 110, two connecting portions 120, two first rolled edge portions 130, and a second rolled edge portion 140. The two connecting portions 120 are connected to both sides of the main body 110 along a first direction and are symmetrically inclined relative to the main body 110. The two first rolled edge portions 130 are connected parallel to the two ends of the two connecting portions 120 that are far apart from each other, and have a first bending structure. The second rolled edge portion 140 is connected to one end of one of the first rolled edge portions 130 that is far away from the connecting portion 120, and has a second bending structure. The second rolled edge portion 140 can be bent at a first angle to cover the first rolled edge portion 130, and cause the first rolled edge portion 130 to bend at a second angle, so that the two roofing panels 100 are connected to each other.

[0032] The roofing panel 100 provided in this embodiment can be connected to adjacent roofing panels 100 by curling together a first rolled edge portion 130 and a second rolled edge portion 140. The second rolled edge portion 140 is essentially an extension of the first rolled edge portion 130. The second rolled edge portion 140 first bends to cover the first rolled edge portion 130, and then the first rolled edge portion 130 bends to cover the edge of the second rolled edge portion 140 as well. This ensures that the edges of both the first rolled edge portion 130 and the second rolled edge portion 140 are covered internally, greatly improving the sealing and waterproofing performance. Furthermore, no fasteners or drilling are required for connection, and no additional clamps are needed for holding the panels. This does not compromise the waterproofing performance of the roofing panel 100. The assembled roofing panels 100 also exhibit good tightness, improving their wind uplift resistance and enhancing their overlap rigidity and waterproofing functionality.

[0033] In one feasible implementation, please refer to Figures 3 to 4 The first angle is the same as the second bending angle, and the second angle is the same as the angle of the first bending structure. Specifically, let the two sides of the first bending structure be the first side 131 and the second side 132, and let the bending angle between the first side 131 and the second side 132 be α. Let the two sides of the second bending structure be the third side 141 and the fourth side 142, and let the bending angle between the third side 141 and the fourth side 142 be β. Since the second rolled edge 140 is a bending structure extending from the first rolled edge 130, that is, the second side 132 and the third side 141 are on the same straight line (e.g., ...). Figure 3 (as in 4a). Therefore, when the first angle is also α, that is, when the fourth side 142 of the bent structure is bent by α, the fourth side 142 is exactly in contact with the second side 132 or parallel to the second side 132. In other words, the second side 132 of the first rolled edge 130 is already surrounded by the third side 141 and the fourth side 142 of the second rolled edge 140 (as in 4a). Figure 3 (4b) When the second angle is β, the second rolled edge 140 continues to bend along with the second edge 132 of the first rolled edge 130 until the fourth edge 142 of the second rolled edge 140 fits against the first edge 131 of the first rolled edge 130. Alternatively, it can be said that the first edge 131, the second edge 132, the third edge 141, and the fourth edge 142 are parallel to each other. Thus, the fourth edge 142 of the second rolled edge 140 is again surrounded by the first edge 131 and the second edge 132 of the first rolled edge 130. The first rolled edge 130 and the second rolled edge 140 are enclosed by a line, tightly connected (as shown in Figure 4b). Figure 3 (4c in the text). This angle setting allows for better assembly of the two roof panels 100 during connection and assembly, resulting in good sealing after connection, stable and firm connection, improved wind uplift resistance of the roof panels 100, and enhanced overlap rigidity and waterproof functionality of the roof panels 100.

[0034] In a feasible implementation, such as Figure 1 As shown, the first angle is 90°, and the second angle is 90°. This angle setting, with its right-angle bends, significantly enhances the rigidity and load-bearing capacity of the material. During manufacturing, 90-degree bends are generally easier and less costly to achieve than other angles; when multiple components need to be assembled together, 90-degree bends help simplify the assembly process; the standard angle ensures a tighter fit between parts, reducing the need for additional adjustments. The right-angle design also facilitates the stacking of multiple roof panels 100. Right-angle connection points provide better support and stability, thus ensuring good stacking stability during the stacking and transportation of the roof panels 100 after manufacturing, and preventing damage during handling.

[0035] In one feasible implementation, the first angle can also be other angles, and bending and wrapping can also be achieved, which will not be elaborated here.

[0036] In one feasible implementation, the portion of the connecting part 120 that connects to the main body 110 has an angle greater than 90° and less than 180°. This creates an outwardly flared opening structure between the connecting part 120 and the main body 110, resembling a trapezoidal or polygonal groove. This shape facilitates the rapid drainage of rainwater or other liquids, reducing water accumulation, helping to keep the roof dry, and extending its service life. In another feasible implementation, the main body 110 can have a continuous concave-convex structure. The concave-convex design increases the rigidity and bending resistance of the panel. By forming corrugations or ribs on the panel, external pressure can be effectively dispersed and absorbed, making the panel more robust and durable. The concave-convex shape facilitates the rapid drainage of rainwater or other liquids, reducing water accumulation. This design prevents leaks caused by moisture buildup and helps keep the roof dry, extending its service life. The concave-convex structure can provide an additional air layer to some extent, thereby improving thermal insulation. Air is a poor conductor of heat, so these gaps help reduce heat transfer and lower temperature fluctuations inside the building. Some textured designs also have aesthetic value, adding a unique appearance to buildings. Different textures and patterns can make a roof look more attractive. In certain situations, such as when people need to walk on the roof for maintenance, textured surfaces provide better grip, reducing the risk of slipping. Compared to completely flat panels, panels with textured structures can use less material to achieve the same strength requirements, thus reducing overall weight and facilitating transportation and installation. Textured designs can also help resist wind pressure, especially in high-wind-speed areas, where this design can better withstand the impact of wind on the roof. In this case, the angle between the connecting part 120 and the main body 110 can correspond to the textured structure of the main body 110. In this way, when multiple roof panels 100 are connected, the consistency and continuity of the roof's textured structure can be maintained, further improving the roof's wind uplift resistance and strengthening the overlap rigidity and waterproofing functionality of the roof panels 100.

[0037] In one feasible implementation, the connecting portion 120 has a third bend structure 121, the sum of the angle γ of the third bend structure 121 and the angle δ of the inclination δ being greater than 270°. That is, the connecting portion 120 also has an obtuse-angle bend, and while the connecting portion 120 and the main body 110 form an open groove structure, the edge of the groove also has a bend angle, denoted as γ. The bend angle γ makes the groove not a simple trapezoid, but a polygon, thus providing better structural stability. The polygonal cross-section of the roofing panel 100 can better distribute the load, thereby improving the overall load-bearing capacity of the structure. The non-rectangular design helps to distribute the forces acting on the object more evenly, reducing stress concentration points, thereby extending service life and reducing the risk of damage.

[0038] In one feasible implementation, the roofing panel 100 includes a waterproof layer 101 and a metal layer 102 sequentially along its thickness direction. The waterproof layer 101 is either a thermoplastic polyolefin (TPO) waterproof membrane or a polyvinyl chloride (PVC) waterproof membrane. TPO is an environmentally friendly material free of plasticizers, halogens, and other harmful substances. It meets green building standards, has strong weather resistance, excellent UV resistance, and can withstand long-term direct sunlight without aging, making it suitable for applications exposed to outdoor environments. It also has good flexibility, maintaining good flexibility and ductility even at low temperatures, facilitating adaptation to complex building structures during construction. Furthermore, it is resistant to chemical corrosion, exhibiting excellent resistance to various chemicals, making it suitable for industrial plants and other locations where chemical pollution risks may exist. White or light-colored TPO surfaces have high reflectivity, helping to reduce the internal temperature of buildings and decrease air conditioning energy consumption. PVC materials, on the other hand, can have their formulations adjusted to meet different needs, such as increasing flame retardancy or improving cold resistance. Seamless connections can be achieved through hot air welding technology, ensuring the overall continuity and sealing of the waterproof layer 101. Under normal circumstances, PVC waterproof membrane can provide protection for over 20 years, and even longer with proper maintenance. PVC material itself has high tensile and tear strength, capable of withstanding certain physical impacts without damage. If localized damage occurs, it can be quickly repaired with simple welding patches, without needing to replace the entire sheet. Compared to traditional waterproof materials, both TPO and PVC are relatively lightweight, helping to reduce the overall weight of the building. Both can be installed using various methods such as mechanical fastening and full adhesion, offering high adaptability.

[0039] In one feasible implementation, the roofing panel 100 has a thickness of 1.8mm-2.4mm. Optionally or preferably, the roofing panel 100 has a thickness of 1.8mm, 2.1mm, or 2.4mm. This thickness allows for better bending of the first rolled edge 130 and the second rolled edge 140. Excessive thickness makes bending difficult and assembly challenging. A roofing panel 100 with a thickness of 1.8mm to 2.4mm has good mechanical strength and rigidity, enabling it to withstand greater external pressures such as wind and snow loads, reducing the risk of deformation. Thicker panels are less prone to vibration, contributing to improved overall building stability. Increased thickness means the material is more robust and durable, offering better resistance to daily wear and tear and severe weather conditions such as strong winds and hail. Thicker panels are also less likely to be penetrated or damaged, extending their service life. For thicker layers, the thickness of the waterproof layer 101 can be increased accordingly. The waterproof layer 101 can also be hot-air welded after the edges are rolled, further enhancing its sealing and waterproofing performance. This makes joint treatment more reliable and reduces the risk of leakage caused by insufficient material thickness. During installation, thicker panels are easier to keep flat, and the increased thickness helps improve sound insulation, which is especially important for buildings requiring a good acoustic environment. It can effectively isolate external noise and improve indoor comfort. Although metal itself is non-combustible, appropriately thick panels can better resist high temperatures and slow the spread of fire. Although the initial investment may be higher, the overall maintenance cost is relatively low due to its long service life and low maintenance frequency. For large-span designs, this type of panel provides sufficient support and is suitable for a wide range of applications.

[0040] In one feasible implementation, the waterproof layer 101 has a thickness of 1.2mm-1.8mm. A thickness of 1.2mm to 1.8mm provides good waterproofing performance, effectively preventing water penetration and protecting the structure and internal spaces from water damage. This appropriate thickness ensures the waterproofing material forms a continuous and complete barrier. Compared to a thinner waterproof layer 101, a thickness of 1.2mm to 1.8mm offers better aging resistance and durability. This means the waterproof layer 101 can maintain its performance for a longer period when exposed to UV radiation, temperature changes, and other environmental factors. The appropriately thick waterproof layer 101 also offers better flexibility and ductility, providing some resistance to cracks caused by structural movement or temperature changes. This helps reduce the risk of leakage. Within this thickness range, the waterproofing material is neither too thick for difficult application nor too thin for uneven coverage. This simplifies the construction process and improves work efficiency while ensuring waterproofing effectiveness. A 1.2mm to 1.8mm thick waterproofing layer (101) provides sufficient protection and is generally a cost-effective option. While an excessively thick layer may offer an extra safety margin, it also increases material costs and construction complexity; conversely, an excessively thin layer may result in poor waterproofing and, in the long run, increased maintenance costs. This thickness range is suitable for the preparation of waterproofing materials such as TPO or PVC. Many countries and regions have specific standards and regulations regarding the thickness of the 101 waterproofing layer.

[0041] In one feasible implementation, the thickness of the metal layer 102 is 0.6mm-1.2mm. Metal sheets thicker than 0.6mm to 1.2mm provide good mechanical properties, sufficient to meet the structural requirements of most construction and manufacturing applications. This thickness ensures adequate rigidity and bending resistance while maintaining relative lightness. Metal sheets within this thickness range are relatively easy to cut, bend, and stamp, suitable for manufacturing parts of various shapes and sizes. This is highly beneficial for improving production efficiency and reducing costs. Compared to thicker materials, 0.6mm to 1.2mm metal sheets are lighter, which helps reduce the burden on the overall structure and may lower transportation costs. Furthermore, using appropriate amounts of material helps control costs and avoid unnecessary waste. Appropriate thickness combined with suitable surface treatments (such as galvanizing, painting, etc.) gives the metal sheet good corrosion resistance and extends its service life. This is particularly important for applications in outdoor or humid environments. Metal sheets within this thickness range can regulate heat transfer to a certain extent, neither being overly conductive nor overly insulating, suitable for applications requiring some insulation but not complete isolation from temperature changes. Using metal sheets of appropriate thickness helps reduce resource consumption, aligning with the principles of sustainable development. Furthermore, many metal materials are recyclable, further reducing environmental impact.

[0042] In one feasible implementation, the roofing panel 100 further includes an anti-corrosion layer 103. The anti-corrosion layer 103 is disposed on the side of the metal layer 102 away from the waterproof layer 101. The anti-corrosion layer 103 effectively prevents moisture, oxygen, and various corrosive substances in the air from eroding the metal substrate, thereby significantly extending the service life of the roofing panel 100. By adding a specially designed anti-corrosion coating, the metal roofing panel 100 can better resist the effects of harsh environmental conditions such as ultraviolet radiation and acid rain, maintaining its appearance and performance for a long time. Good anti-corrosion treatment reduces the need for regular maintenance or replacement of the roofing panel 100, lowering long-term maintenance costs. This makes the total cost of ownership of the entire building project more economical. Some anti-corrosion coatings also possess certain flame-retardant properties, which can improve the fire resistance rating of the roofing panel 100 to a certain extent, providing additional safety for the building. Specific types of anti-corrosion coatings have been developed for different environmental conditions (such as high-salt-spray environments in coastal areas and highly polluted environments in industrial areas) to ensure good performance under various harsh conditions. Some anti-corrosion coatings can also enhance the impact resistance and wear resistance of the board, further improving its physical properties.

[0043] In one feasible implementation, the anti-corrosion layer 103 is made of TPO membrane, and the thickness of the anti-corrosion layer 103 is ≥0.18mm. TPO material has excellent UV resistance and oxidation resistance, and can be exposed to the outdoor environment for a long time without aging. This helps to extend the overall service life of the roofing panels. TPO membrane is a polymer material with excellent waterproof performance. A TPO membrane of 0.18mm or more can form a continuous, seamless protective layer, effectively preventing moisture from penetrating into the metal substrate, thereby reducing the risk of corrosion. TPO has good resistance to a variety of chemicals, including acid and alkali solutions, and is suitable for industrial areas or other environments where chemical pollution may exist. TPO is an environmentally friendly material, free of plasticizers, halogens and other harmful substances, meeting green building standards and contributing to environmental protection. TPO membranes with a thickness of 0.18mm or more have good mechanical strength, are not easily torn or penetrated, and can provide better physical protection. TPO membranes can be seamlessly connected using hot air welding technology, ensuring the overall continuity and sealing of the waterproof layer and reducing the possibility of leakage. TPO membranes are relatively lightweight and will not significantly increase the weight burden of the roofing system. Meanwhile, it maintains good flexibility and ductility even at low temperatures, making it easy to adapt to complex building structures during construction. If localized damage occurs, it can be repaired through simple welding without replacing the entire material, reducing maintenance costs and complexity. TPO materials typically possess certain flame-retardant properties, which can improve the fire resistance rating of roofing panels to some extent, enhancing building safety.

[0044] Further, optionally or preferably, the thickness of the roofing panel 100 is 1.8mm, 2.1mm, or 2.4mm; the thickness of the waterproof layer 101 of the roofing panel 100 is 1.2mm, 1.5mm, or 1.8mm; the thickness of the anti-corrosion layer 103 is ≥0.18mm; and the thickness of the metal layer 102 is ≥0.6mm. Alternatively or preferably, the thickness of the roofing panel 100 is 2.4mm; the thickness of the waterproof layer 101 of the roofing panel 100 is 1.5mm; the thickness of the metal layer 102 is 0.6mm; and the thickness of the anti-corrosion layer 103 is 0.3mm. This thickness structure allows the aforementioned properties of the roofing panel 100 to achieve an optimal combination.

[0045] Accordingly, this application also provides a roofing system. The roofing system includes at least two roofing panels as described in any of the preceding claims. Adjacent roofing panels are connected by a first rolled edge and a second rolled edge. The roofing system provided by this application includes all the advantages of the roofing panels, which will not be elaborated here.

[0046] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0047] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A roofing panel, characterized in that, The roofing panels include: One main body, Two connecting parts are connected to both sides of the main body along the first direction and are symmetrically inclined relative to the main body; Two first rolled edges are connected in parallel to the two ends of the two connecting parts that are far apart from each other, and have a first bending structure; A second rolled edge, connected to one end of one of the first rolled edges away from the connecting portion, has a second bending structure; The second rolled edge can be bent at a first angle to cover the first rolled edge, and cause the first rolled edge to bend at a second angle so that the two roof panels are connected to each other.

2. The roofing material according to claim 1, characterized in that, The first angle is the same as the second bending angle, and the second angle is the same as the angle of the first bending structure.

3. The roofing material according to claim 2, characterized in that, The first angle is 90°, and the second angle is 90°.

4. The roofing material according to claim 1, characterized in that, The portion of the connecting part that connects to the main body has an inclination angle greater than 90° and less than 180°.

5. The roofing material according to claim 4, characterized in that, The connecting part has a third bending structure, and the sum of the angle of the third bending structure and the angle of the tilt is greater than 270°.

6. The roofing material according to claim 1, characterized in that, The roofing panel includes a waterproof layer and a metal layer in sequence along the thickness direction, wherein the waterproof layer is a thermoplastic polyolefin waterproof membrane or a polyvinyl chloride waterproof membrane.

7. The roofing material according to claim 6, characterized in that, The thickness of the roofing panels is 1.8mm-2.4mm.

8. The roofing material according to claim 7, characterized in that, The thickness of the waterproof layer is 1.2mm-1.8mm, and the thickness of the metal layer is 0.6mm-1.2mm.

9. The roofing material according to claim 6, characterized in that, The roofing material also includes an anti-corrosion layer, which is disposed on the side of the metal layer away from the waterproof layer.

10. A roofing system, characterized in that, It includes at least two roofing panels as described in any one of claims 1 to 9, with adjacent roofing panels connected by a first rolled edge and a second rolled edge.

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