Roof system

Abstract

The embodiment of the utility model provides a roof system, which comprises a plurality of purlines, a plurality of roof panels and a plurality of roof panels, the plurality of purlines are arranged at intervals in a first direction, and each purline extends in a second direction perpendicular to the first direction; the roof panel is arranged above the purlines, and a daylighting opening is defined by the roof panel; the daylighting panel covers the daylighting opening, and a sealing layer is arranged between the daylighting panel and the roof panel; the supporting piece extends in the first direction, and the supporting piece is supported between the roof panel and the purline. According to the technical scheme, the daylighting panel and the roof panel can be connected more stably, the lap joint strength and lap joint sealing performance of the daylighting panel and the roof panel are improved, and leakage of the lap joint position of the daylighting panel and the roof panel is avoided. Moreover, the roof system is simple in structure, no keel needs to be additionally arranged, the material consumption can be reduced, the cost is reduced, the construction process is simplified, the construction speed is increased, and the construction period is shortened.

Description

Technical Field

[0001] The present application relates to the field of building technology, and in particular to a roofing system. Background Art

[0002] In the related art, due to the large size of industrial plants, roof lighting is very important for industrial plants, and lighting panels are required. However, there is a gap between the lighting panels and the roof panels. When it rains and blows, rainwater easily flows into the room through the gap, causing leakage. Utility Model Content

[0003] The embodiments of the present application provide a roofing system to solve or alleviate one or more technical problems in the prior art.

[0004] As one aspect of an embodiment of the present application, the embodiment of the present application provides a roofing system, including: a plurality of purlins, the plurality of purlins are arranged at intervals in a first direction, and each purlin extends in a second direction perpendicular to the first direction; a roof panel, arranged above the plurality of purlins, the roof panel defining a skylight; a skylight board, covering the skylight board, a sealing layer is arranged between the skylight board and the roof panel; a support member, extending along the first direction, the support member being supported between the roof panel and the purlin.

[0005] In one embodiment, the support member includes: a first support portion, the roof panel is overlapped on the first support portion, the first support portion is parallel to the first direction and parallel to the second direction; a second support portion, overlapped on the purlin, the second support portion is parallel to the first support portion; and a connecting portion, connected between the first support portion and the second support portion.

[0006] In one embodiment, the sealing layer includes a butyl waterproof tape layer and a weather-resistant adhesive layer in contact with each other.

[0007] In one embodiment, the roof panel includes crests and troughs periodically and alternately arranged in the second direction, and the crests protrude from the troughs; the skylight has two first edge areas arranged opposite to each other in the second direction, and each first edge area overlaps the corresponding crest.

[0008] In one embodiment, the skylight has two first edge areas arranged opposite to each other in the second direction and a second edge area and a third edge area arranged opposite to each other in the first direction, each first edge area and the second edge area are respectively overlapped with the roof panel, and the third edge area is located between the roof panel and the purlin; wherein, in the second direction, the third edge area is higher than the second edge area.

[0009] In one embodiment, the roof panel includes crests and troughs periodically and alternately arranged in a second direction, and the crests protrude from the troughs; the roof system also includes a first fastener and a second fastener, the first fastener is passed through the second edge area, the crests and the purlin, and the second fastener is passed through the troughs, the third edge area and the purlin.

[0010] In one embodiment, the roofing system further includes: a metal strip overlapped at the second edge region, and a second fastener is passed through the metal strip, the second edge region, the crest portion and the purlin.

[0011] In one embodiment, the roofing system further includes: a waterproof covering sheet connected to the roofing panel, and the waterproof covering sheet covers the corresponding second fastener.

[0012] In one embodiment, the roofing system also includes: a third fastener, which is passed through the skylight board, the sealing layer, the roof panel, the support member and the purlin; a fourth fastener, which is staggered with the purlin, and the fourth fastener is passed through the skylight board, the sealing layer, the roof panel and the support member, and the length of the fourth fastener is less than the length of the third fastener.

[0013] In one embodiment, the roof panel includes a plurality of composite panels arranged in sequence in the second direction, each composite panel includes a stacked metal layer and a waterproof layer, the waterproof layer is located on the side of the metal layer away from the purlin, and the waterproof layers of two adjacent composite panels are sealed and connected.

[0014] The embodiment of the present application adopts the above technical solution to make the connection between the skylight board and the roof panel more stable, improve the overlap strength and overlap sealing of the skylight board and the roof panel, and avoid leakage at the overlap position of the skylight board and the roof panel. In addition, the structure of the roof system is simple, and no additional keel is required, which can reduce the amount of materials used, reduce costs, simplify the construction process, increase the construction speed, and shorten the construction period.

[0015] The above summary is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments and features described above, further aspects, embodiments and features of the present application will be readily apparent by reference to the accompanying drawings and the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the multiple drawings represent the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments disclosed in the present application and should not be regarded as limiting the scope of the present application.

[0017] Figure 1 A top view of a roofing system according to an embodiment of the present application is shown;

[0018] Figure 2 Shown along Figure 1 Sectional view along line AA;

[0019] Figure 3 Show Figure 2 The enlarged view of the C section circled in the middle;

[0020] Figure 4 Shown along Figure 1 Sectional view along the midline BB;

[0021] Figure 5 Show Figure 4 An enlarged view of the D section circled in the middle;

[0022] Figure 6 Show Figure 5 The enlarged view of the E part circled in the middle;

[0023] Figure 7 A schematic diagram showing the structure of a metal pressure strip according to an embodiment of the present application is shown;

[0024] Figure 8 A schematic diagram showing the connection between the fourth fastener and the skylight panel, the sealing layer, the roof panel and the support member according to an embodiment of the present application is shown.

[0025] Description of reference numerals:

[0026] 10: roof system; 100: purlin; 200: roof panel; 210: crest; 220: trough; 300: skylight; 310: first edge region; 320: second edge region; 330: third edge region; 400: sealing layer; 500: support member; 510: first support portion; 520: second support portion; 530: connecting portion; 610: first fastener; 620: second fastener; 630: third fastener; 640: fourth fastener; 700: metal strip; 800: waterproof covering sheet; L1: first direction; L2: second direction. DETAILED DESCRIPTION

[0027] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the present application. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0028] In the related art, due to the large size of industrial plants, roof lighting is very important for industrial plants, and lighting panels need to be configured. The roof panels of industrial plants include composite roof panels and metal roof panels. Among them, the composite roof panel includes a metal layer and a waterproof layer stacked in layers, which performs well in many aspects such as construction convenience, waterproofness, durability and economy, and is very popular in the market. For the composite roof panel, it is necessary to process a keel higher than the composite roof panel in the lighting area, and then the keel is wrapped and sealed with insulation materials and coils, and finally the lighting panel is placed on the keel. This method requires the use of a keel, which increases the keel material and installation cost, and increases the workload and material loss at the corners of the coil. In addition, the lighting panel and the keel need to be edged with metal, which will also increase the material consumption and installation cost, and extend the construction period. For metal roof panels, the lighting panel is usually overlapped with the metal roof panel. However, there is a gap at the overlap position of the lighting panel and the metal roof panel. When it is rainy and windy, rainwater can easily flow into the room through the gap, causing leakage.

[0029] Combine the following Figure 1-Figure 8 A roofing system according to an embodiment of the present application is described.

[0030] Figure 1 A top view of a roofing system according to an embodiment of the present application is shown; Figure 2 Shown along Figure 1 Sectional view along line AA; Figure 3 Show Figure 2 The enlarged view of the circled section C. Figure 1-Figure 3 As shown, the roof system 10 includes a roof panel 200, a skylight 300, a support member 500 and a plurality of purlins 100. In the description of the present application, "plurality" means two or more.

[0031] Specifically, a plurality of purlins 100 are arranged at intervals in a first direction L1, and each purlin 100 extends in a second direction L2 perpendicular to the first direction L1. A roof panel 200 is disposed above the plurality of purlins 100, and the roof panel 200 defines a daylighting opening. A daylighting board 300 covers the daylighting opening, and a sealing layer 400 is disposed between the daylighting board 300 and the roof panel 200. A support member 500 extends along the first direction L1, and the support member 500 is supported between the roof panel 200 and the purlin 100.

[0032] Exemplarily, the skylight 300 can be a FRP skylight, that is, glass fiber reinforced polyester, commonly known as FRP, also known as transparent tiles, anti-corrosion tiles, sunshine tiles, etc. The FRP skylight is mainly composed of a high-performance upper film, reinforced polyester and glass fiber, wherein the upper film plays a good role in anti-ultraviolet and anti-static. Anti-ultraviolet is to protect the polyester of the FRP skylight from yellowing and aging, and premature loss of light transmission properties. Due to the different types of resins used, there are polyester FRP, epoxy FRP, and phenolic FRP. Anti-static is to ensure that the dust on the surface is easily washed away by rain or wind, maintaining a clean and beautiful surface. Among them, the thickness of the skylight 300 can be 1.5mm to 2.0mm (including the endpoint values).

[0033] According to the roofing system 10 of the embodiment of the present application, by providing a sealing layer 400 between the skylight board 300 and the roof panel 200, and supporting members 500 supported between the roof panel 200 and the purlin 100, the skylight board 300, the sealing layer 400, the roof panel 200, the supporting members 500 and the purlin 100 can be connected into a whole, so that the connection between the skylight board 300 and the roof panel 200 is more stable, the overlap strength and overlap sealing of the skylight board 300 and the roof panel 200 are improved, and leakage at the overlap position of the skylight board 300 and the roof panel 200 is avoided. Moreover, the roofing system 10 has a simple structure, does not need to set up an additional keel, can reduce the amount of materials used, reduce costs, simplify the construction process, improve the construction speed, and shorten the construction period.

[0034] In one embodiment, if Figure 1 and Figure 3 As shown, the support member 500 may include a first support portion 510, a second support portion 520 and a connection portion 530. The roof panel 200 is overlapped with the first support portion 510, and the first support portion 510 is parallel to the first direction L1 and the second direction L2. The second support portion 520 is overlapped with the purlin 100, and the second support portion 520 is parallel to the first support portion 510. The connection portion 530 is connected between the first support portion 510 and the second support portion 520. For example, Figure 1 and Figure 3 In the example of FIG. 5 , the support member 500 may be formed in a “Z” shape. The first support portion 510 , the second support portion 520 , and the connection portion 530 may all extend along the first direction L1 . The connection portion 530 may be perpendicular to the first support portion 510 .

[0035] In this embodiment, by making the support member 500 include a first support portion 510, a second support portion 520 and a connecting portion 530, the first support portion 510 can be firmly connected to the roof panel 200, the second support portion 520 can be firmly connected to the purlin 100, and the connecting portion 530 can be supported between the first support portion 510 and the second support portion 520, thereby avoiding deformation of the overlapping position of the roof panel 200 and the skylight panel 300, and further ensuring the strength and stability of the overlapping position of the skylight panel 300 and the roof panel 200.

[0036] In one embodiment, the sealing layer 400 may include a butyl waterproof tape layer and a weather-resistant adhesive layer in contact with each other. For example, at least part of the weather-resistant adhesive layer may be located on the side of the butyl waterproof tape layer away from the purlin 100. Thus, by making the sealing layer 400 include the butyl waterproof tape layer and the weather-resistant adhesive layer, since the butyl waterproof tape layer has a certain thickness, the overlapping position of the lighting board 300 and the roof panel 200 has a certain thickness of sealant, which can ensure the sealing of the overlapping position of the lighting board 300 and the roof panel 200 to a certain extent, and avoid the sealing of the overlapping position due to the overlapping of the lighting board 300 and the roof panel 200. Thinning or even causing the overlap of the sealing at the overlapping position without sealing; the weather-resistant adhesive layer can fully fill the gap at the overlapping position whose thickness is greater than the butyl waterproof tape layer, ensuring that the overlapping position of the lighting board 300 and the roof panel 200 has a good sealing and waterproof effect, thereby avoiding leakage.

[0037] In one embodiment, referring to Figure 1-Figure 3 The roof panel 200 includes crest portions 210 and trough portions 220 that are periodically and alternately arranged in the second direction L2, and the crest portions 210 protrude from the trough portions 220; the skylight panel 300 has two first edge areas 310 that are relatively arranged in the second direction L2, and each first edge area 310 overlaps the corresponding crest portion 210.

[0038] For example, in combination Figure 1-Figure 3 , the crest portion 210 protrudes relative to the trough portion 220 in a direction away from the purlin 100. The crest portion 210 can overlap the first support portion 510 of the support member 500. The shape of the lighting panel 300 can be adapted to the shape of the roof panel 200. The lighting panel 300 may include lighting crest portions and lighting trough portions that are periodically and alternately arranged in the second direction L2, and the lighting crest portions protrude from the lighting trough portions. The first edge area 310 may include a lighting crest portion, and the lighting crest portion may be snap-fitted and overlapped with the crest portion 210. Optionally, the size of each first edge area 310 in the second direction L2 may be 280 mm to 320 mm (including the endpoint values), such as 300 mm, but is not limited thereto.

[0039] In this embodiment, by overlapping each first edge area 310 with the corresponding peak portion 210, since the peak portion 210 protrudes from the trough portion 220, the peak portion 210 can play a certain limiting role on the light board 300, avoiding displacement of the light board 300, thereby effectively improving construction efficiency.

[0040] Figure 4 Shown along Figure 1 Sectional view along the midline BB; Figure 5 Show Figure 4 An enlarged view of the D section circled in the middle; Figure 6 Show Figure 5 In one embodiment, as Figure 1 , Figure 4-Figure 6 As shown, the skylight panel 300 has two first edge areas 310 arranged opposite to each other in the second direction L2 and a second edge area 320 and a third edge area 330 arranged opposite to each other in the first direction L1. The first edge areas 310 and the second edge areas 320 are respectively overlapped with the roof panel 200, and the third edge area 330 is located between the roof panel 200 and the purlin 100; wherein, in the second direction L2, the third edge area 330 is higher than the second edge area 320.

[0041] For example, Figure 4 The arrow direction in the figure is the drainage direction. In the drainage direction, the third edge region 330 is located upstream of the second edge region 320. The length of the second edge region 320 in the second direction L2 may be equal to the length of the third edge region 330 in the second direction L2, and the length of the first edge region 310 in the first direction L1 is greater than the length of the second edge region 320 in the second direction L2.

[0042] In this embodiment, by overlapping the first edge area 310 and the second edge area 320 on the roof panel 200 respectively, and the third edge area 330 being located between the roof panel 200 and the purlin 100, it helps to more effectively guide rainwater along the roof panel 200 and the skylight panel 300 to the drainage system, thereby avoiding rainwater retention and infiltration.

[0043] In one embodiment, in combination Figure 1 , Figure 4-Figure 6 The roof panel 200 includes a crest portion 210 and a trough portion 220 periodically and alternately arranged in the second direction L2, and the crest portion 210 protrudes from the trough portion 220. The roof system 10 also includes a first fastener 610 and a second fastener 620, the first fastener 610 is inserted through the second edge region 320, the crest portion 210 and the purlin 100, and the second fastener 620 is inserted through the trough portion 220, the third edge region 330 and the purlin 100.

[0044] Exemplarily, since the crest portion 210 protrudes from the trough portion 220, and the first fastener 610 is disposed through the crest portion 210, and the second fastener 620 is disposed through the trough portion 220, the length of the first fastener 610 may be greater than the length of the second fastener 620. For example, the length of the first fastener 610 may be 68 mm, and the length of the second fastener 620 may be 35 mm. Optionally, the first fastener 610 and the second fastener 620 may both be self-tapping screws, but are not limited thereto.

[0045] In this embodiment, by passing the first fastener 610 through the second edge region 320, the crest portion 210 and the purlin 100, the second edge region 320 of the lighting board 300 and the crest portion 210 can be firmly fastened and overlapped, thereby preventing rainwater from flowing into the room through the gap between the second edge region 320 and the crest portion 210. By passing the second fastener 620 through the trough portion 220, the third edge region 330 and the purlin 100, the third edge region 330 of the lighting board 300 and the trough portion 220 can be firmly overlapped, and installation is facilitated.

[0046] Figure 7 FIG. 7 is a schematic diagram showing the structure of a metal pressure strip 700 according to an embodiment of the present application. Figure 1 , Figure 2 , Figure 5 and Figure 7 The roof system 10 may further include a metal bead 700, the metal bead 700 is overlapped on the second edge region 320, and the second fastener 620 is passed through the metal bead 700, the second edge region 320, the crest portion 210 and the purlin 100. Exemplarily, the shape of the metal bead 700, the shape of the lighting board 300 and the shape of the roof panel 200 may be adapted. A butyl tape may be provided between the metal bead 700 and the second edge region 320 to ensure a sealing effect. The metal bead 700 may be an aluminum alloy bead, but is not limited thereto.

[0047] In this embodiment, by providing the metal pressure strip 700 , it is possible to prevent rainwater from flowing back into the room through the raised gap due to the second edge area 320 being lifted up at a position corresponding to the trough portion 220 , thereby further ensuring the sealing and waterproof effect of the roof system 10 .

[0048] In one embodiment, if Figure 1 and Figure 6As shown, the roofing system 10 may further include a waterproof covering sheet 800, which is connected to the roofing panel 200 and covers the corresponding second fasteners 620. Thus, the waterproof covering sheet 800 can effectively prevent the second fasteners 620 from being exposed, prevent the second fasteners 620 from contacting the natural environment, and ensure the sealing of the installation hole for installing the second fasteners 620, thereby preventing the second fasteners 620 from rusting or falling off, and further preventing the roofing system 10 from leaking.

[0049] Figure 8 FIG. 6 is a schematic diagram showing the connection between the fourth fastener 640 and the lighting board 300, the sealing layer 400, the roofing board 200 and the support member 500 according to an embodiment of the present application. Figure 1 , Figure 3 and Figure 8 As shown, the roof system 10 may further include a third fastener 630 and a fourth fastener 640. The third fastener 630 is disposed through the lighting board 300, the sealing layer 400, the roof panel 200, the support member 500 and the purlin 100. The fourth fastener 640 is staggered with the purlin 100, and the fourth fastener 640 is disposed through the lighting board 300, the sealing layer 400, the roof panel 200 and the support member 500, and the length of the fourth fastener 640 is less than the length of the third fastener 630.

[0050] Exemplarily, the third fastener 630 can be threadedly connected to the purlin 100 after passing through the lighting board 300, the sealing layer 400, the roof panel 200 and the first support part 510 respectively. The fourth fastener 640 can be threadedly connected to the first support part 510 after passing through the lighting board 300, the sealing layer 400 and the roof panel 200 respectively. Among them, the third fastener 630 and the fourth fastener 640 can both be self-tapping screws, and the nail head of the third fastener 630 can be provided with a waterproof gasket. The second support part 520 of the support member 500 can be connected to the purlin 100 by a threaded fastener. Optionally, the length of the third fastener 630 can be 68 mm, and the length of the fourth fastener 640 can be 30 mm, but it is not limited thereto.

[0051] In this embodiment, the fourth fastener 640 can connect the light board 300, the sealing layer 400, the roof panel 200 and the support member 500 into a whole, and the third fastener 630 can fix the light board 300, the sealing layer 400, the roof panel 200 and the support member 500 to the purlin 100, further ensuring the lap strength and sealing of the light board 300 and the roof panel 200.

[0052] In one embodiment, the roof panel 200 may include a plurality of composite panels arranged in sequence in the second direction L2, each composite panel includes a stacked metal layer and a waterproof layer, the waterproof layer is located on the side of the metal layer away from the purlin 100, and the waterproof layers of two adjacent composite panels are sealed and connected. Exemplarily, the waterproof cover sheet 800 may be hot-air welded to the waterproof layer.

[0053] Exemplarily, the metal layer can be a coated steel plate such as a galvanized steel plate, and the waterproof layer can be a thermoplastic polyolefin waterproof membrane, for example, it can be a new type of waterproof membrane made of a thermoplastic polyolefin (TPO) synthetic resin that combines ethylene propylene rubber and polypropylene using polymerization technology as the base material, with antioxidants, anti-aging agents, and softeners added. Polyester fiber mesh cloth can be used as an internal reinforcement material to make an enhanced waterproof membrane.

[0054] Therefore, by making each composite panel include a stacked metal layer and a waterproof layer, and the waterproof layers of two adjacent composite panels are sealed and connected, the waterproof layers of multiple composite panels can be sealed and connected into an integral structure, thereby ensuring the air tightness of the roof panel 200 and effectively preventing rainwater and dust from entering the room.

[0055] In the description of this specification, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0056] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0057] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0058] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0059] The disclosure above provides many different embodiments or examples to realize the different structures of the present application. In order to simplify the disclosure of the present application, the parts and settings of specific examples are described above. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeat reference numerals and / or reference letters in different examples, and this repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed.

[0060] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of various changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A roofing system, characterized in that: include: A plurality of purlins, wherein the plurality of purlins are arranged at intervals in a first direction, and each of the purlins extends in a second direction perpendicular to the first direction; A roof panel is disposed above the plurality of purlins, wherein the roof panel defines a daylighting opening; A skylight panel covers the skylight opening, and a sealing layer is provided between the skylight panel and the roof panel; A support member extends along the first direction, and the support member is supported between the roof panel and the purlin.

2. The roofing system according to claim 1, characterized in that: The support member comprises: A first supporting portion, the roof panel is overlapped on the first supporting portion, and the first supporting portion is parallel to the first direction and parallel to the second direction; A second supporting portion, overlapped with the purlin, and the second supporting portion is parallel to the first supporting portion; The connecting portion is connected between the first supporting portion and the second supporting portion.

3. The roofing system according to claim 1, characterized in that: The sealing layer comprises a butyl waterproof tape layer and a weather-resistant adhesive layer in contact with each other.

4. The roofing system according to claim 1, characterized in that: The roof panel includes crests and troughs periodically and alternately arranged in the second direction, and the crests protrude from the troughs; the skylight has two first edge areas that are oppositely arranged in the second direction, and each of the first edge areas overlaps the corresponding crest.

5. The roofing system according to claim 1, characterized in that: The skylight has two first edge areas arranged opposite to each other in the second direction, and a second edge area and a third edge area arranged opposite to each other in the first direction. The first edge areas and the second edge areas are respectively overlapped with the roof panel, and the third edge area is located between the roof panel and the purlin; wherein, in the second direction, the third edge area is higher than the second edge area.

6. The roofing system according to claim 5, characterized in that: The roof panel includes crests and troughs periodically and alternately arranged in the second direction, and the crests protrude from the troughs; the roof system also includes a first fastener and a second fastener, the first fastener is passed through the second edge area, the crests and the purlin, and the second fastener is passed through the troughs, the third edge area and the purlin.

7. The roofing system according to claim 6, characterized in that: Also includes: A metal strip is overlapped on the second edge region, and the second fastener is passed through the metal strip, the second edge region, the crest portion and the purlin.

8. The roofing system according to claim 6, characterized in that: Also includes: A waterproof covering sheet is connected to the roof panel, and the waterproof covering sheet covers the corresponding second fastener.

9. The roofing system according to claim 1, characterized in that: Also includes: A third fastener is provided through the lighting board, the sealing layer, the roof panel, the support member and the purlin; The fourth fastener is staggered with the purlin, and the fourth fastener passes through the lighting board, the sealing layer, the roof panel and the support member. The length of the fourth fastener is less than that of the third fastener.

10. The roofing system according to any one of claims 1 to 9, characterized in that: The roof panel includes a plurality of composite panels arranged in sequence in the second direction, each of the composite panels includes a stacked metal layer and a waterproof layer, the waterproof layer is located on a side of the metal layer away from the purlin, and the waterproof layers of two adjacent composite panels are sealed and connected.

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