roofing materials

Abstract

To provide a roofing material that allows rainwater to flow down appropriately while being suitably connected even in a sandwich panel structure having a heat insulating material. [Solution] A roofing material 1 with a sandwich panel structure comprising an upper plate UB which is the upper side when installed on a building, a lower plate LB which is the lower side, and insulation material I provided between the upper plate UB and the lower plate LB, wherein the upper plate UB has a first seam portion LK1 which protrudes upward at the upper part which is above the slope of the roof, and a second seam portion LK2 which protrudes upward at the lower part which is below the slope of the roof and has its tip bent downward toward the slope, and is provided below the first seam portion LK1 and the second seam portion LK2 and overlaps other roofing materials which are connected below the slope of the roof, and the first plate material UB1 and the lower plate LB are provided below the first seam portion LK1 and the second seam portion LK2 and overlap other roofing materials which are connected below the slope of the roof, and the both ends on the sides perpendicular to the slope are higher above the point where they are sandwiched by the both ends.

Description

[Technical Field]

[0001] The present disclosure relates to roofing materials. [Background technology]

[0002] A technique has been proposed for forming a roof that covers the upper part of a building using multiple roofing materials that are smaller than the area of ​​the upper part of the building (see, for example, Patent Document 1). Here, each roofing material needs to be fixed to other roofing materials. For this reason, a structure that connects roofing materials to each other has been proposed (see, for example, Patent Document 2). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2020-176405 [Patent Document 2] Japanese Patent Publication No. 2020-73776 Summary of the Invention [Problem to be solved by the invention]

[0004] In recent years, sandwich panels have been proposed, with insulation sandwiched between upper and lower panels, and research has been conducted into the use of sandwich panels as roofing materials. However, even when sandwich panels are used as roofing materials, they still need to be connected to each other.

[0005] However, because sandwich panels are thick, it is not possible to connect the upper plates of the sandwich panels by bending them as described in Patent Document 2. In other words, even if an attempt is made to fold the upper plate downward, the presence of the insulating material makes it impossible to perform the bending process, and the connecting structure described in Patent Document 2 cannot be adopted.

[0006] Additionally, it is preferable that the roofing material properly drains rainwater when it rains.

[0007] The object of the present disclosure is to provide a roofing material that can provide suitable connections and allow rainwater to flow off appropriately, even in a sandwich panel structure with insulating material. [Means for solving the problem]

[0008] A roofing material according to one aspect of the present disclosure is a sandwich panel structure roofing material comprising an upper plate that will be on the upper side when installed on a building, a lower plate that will be on the lower side, and insulation material provided between the upper and lower plates, wherein the upper plate has a first seam portion that protrudes upward at the upper part that is above the slope of the roof, and a second seam portion that protrudes upward at the lower part that is below the slope of the roof and has its tip bent toward the downward slope, and is provided with an overlap plate that is provided below the first seam portion and the second seam portion and overlaps another roofing material that is connected to the lower side of the slope of the roof, and wherein both lateral sides of the overlap plate that are perpendicular to the slope are higher above the points sandwiched between the both ends. [Effects of the Invention]

[0009] According to the present disclosure, it is possible to provide a roofing material that can be suitably connected and allows rainwater to flow off appropriately, even in a sandwich panel structure with insulating material. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a perspective view showing a roofing material according to an embodiment of the present invention. [Figure 2] FIG. 2 is a front view of the roofing material shown in FIG. 1 as viewed along the tilt direction. [Figure 3] FIG. 10 is an enlarged view of the main part when the roofing materials according to this embodiment are stacked in the inclined direction. [Figure 4] 4 is a cross-sectional view of a main part of the upper plate along the inclination direction shown in FIG. 3. [Figure 5]1A and 1B are cross-sectional views of the main part showing a connecting structure using a first seam portion and a second seam portion, where (a) shows the first step, (b) shows the second step, (c) shows the third step, and (d) shows the fourth step. [Figure 6] FIG. 3 is an enlarged front view showing the upper plate shown in FIG. 2. [Figure 7] FIG. 10 is a perspective view showing an overlapping portion of a roofing material according to a comparative example. [Figure 8] This is a process diagram showing the manufacturing method of the first panel of the roofing material in this embodiment, where (a) is the unwinding process, (b) is the cutting process, (c) is the overlapping process, (d) is the temporary fixing process, and (e) is the processing process. [Figure 9] This is a process diagram showing the manufacturing method of the lower panel of the roofing material in this embodiment, where (a) is the second unwinding process, (b) is the second cutting process, (c) is the second overlapping process, (d) is the second temporary fixing process, and (e) is the second processing process. [Figure 10] 9 is a perspective view showing a part of a manufacturing device for manufacturing a first plate material by carrying out the steps shown in FIG. 8. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0011] The present disclosure will be described below in accordance with preferred embodiments. Note that the present disclosure is not limited to the embodiments shown below and can be modified as appropriate without departing from the spirit of the present disclosure. In addition, in the embodiments shown below, some configurations are omitted from illustration and description, but it goes without saying that publicly known or well-known technologies are applied as appropriate to the details of the omitted technologies within the scope of the content described below.

[0012] Fig. 1 is a perspective view showing a roofing material according to this embodiment, and Fig. 2 is a front view of the roofing material shown in Fig. 1 when viewed along the slope direction. As shown in Figs. 1 and 2, the roofing material 1 is intended to be installed, for example, on a sloped structure at the top of a building, and is configured as a so-called sandwich panel comprising an upper plate UB, a lower plate LB, and a thermal insulating material I. In other words, the roofing material 1 has a structure of a predetermined thickness, with the thermal insulating material I sandwiched between the upper plate UB and the lower plate LB.

[0013] Such a roofing material 1 has two parallel ridges 10 on the upper plate UB and a flat portion 20 formed between the two ridges 10. The two ridges 10 are portions that protrude upward from the roofing material 1. When the roofing material 1 is used in a sloped structure at the top of a building, the two ridges 10 are arranged along the slope direction as shown in Figure 1. The two ridges 10 ensure the rigidity of the roofing material 1. When viewed from the front as shown in Figure 2, the two ridges 10 are roughly trapezoidal in shape, tapering upward.

[0014] As shown in Figure 2, the roofing material 1 has two ridges 10, one of which, ridge 10a, is filled with insulating material I, and the other ridge 10b is not filled with insulating material I. As shown in Figure 1, the roofing material 1 is arranged so that the other ridge 10b overlaps one of the ridges 10a of the adjacent roofing material 1 in the width direction, which is perpendicular to the tilt direction. In this arranged state, the roofing materials 1 are firmly connected by inserting a rod-shaped member R, such as a piece of tex, into one of the ridges 10a from above the other ridge 10b.

[0015] As shown in Fig. 1, some of the rod-shaped members Ra among the rod-shaped members R are long enough to extend to the building frame F. Therefore, the roofing material 1 is firmly fixed to the building itself by the rod-shaped members Ra.

[0016] The lower plate LB also has four ridges 10. The first and second ridges 10c, 10d are closely spaced on one side of the lower plate LB in the width direction, and the third and fourth ridges 10e, 10f are closely spaced on the other side in the width direction. The spaces between these adjacent ridges 10c-10f function as gutter-like water catchers when rainwater seeps in through the upper plate UB and the thermal insulation I. Furthermore, a flat surface 20 is formed between the relatively wide second ridge 10d and third ridge 10e, which functions as, for example, a storage space for heat storage material or a water catcher similar to the above. While no flat surface 20 exists between the first and second ridges 10c, 10d or between the third and fourth ridges 10e, 10f in FIG. 2, this is not a limitation, and flat surfaces 20 may be formed.

[0017] In this embodiment, the roofing material 1 is not limited to that shown in Figures 1 and 2. For example, the roofing material 1 may have three or more ridges 10 on the upper plate UB. In addition, the roofing material 1 may be installed so as to be layered on top of another roofing material already installed on top of the building. In this case, it is sufficient that some of the rod-shaped members Ra have a length that reaches at least the other roofing material.

[0018] Fig. 3 is an enlarged view of the main part when the roofing material 1 according to this embodiment is stacked in the tilt direction. As shown in Fig. 3, the upper plate UB of the roofing material 1 has a two-plate structure consisting of two overlapping plates UB1 and UB2.

[0019] The first plate UB1, which is the lower of the two-plate structure, has its end facing downward in the water direction, which is at the bottom of the slope, protruding downward in the water direction beyond the insulating material I. The first plate UB1 of roofing material 1a facing above the water is arranged so that it is overlapped on top of the first plate UB1 of roofing material 1b facing below the water. The overlapping portion between the first plates UB1 of roofing materials 1a and 1b in this manner is called the overlapping portion OL.

[0020] Furthermore, the lower plate LB of roofing material 1b facing downward in the water direction has its end facing upward in the water direction, which is the upper end in the tilting direction, protruding further in the water direction than the insulating material I. The lower plate LB of roofing material 1b facing downward in the water direction is arranged so that it overlaps under the lower plate LB of roofing material 1a facing upward in the water direction. The overlapping portion between the lower plate LB of roofing material 1b and the lower plate LB of roofing material 1a in this manner is also referred to as the overlapping portion OL.

[0021] Figure 4 is a cross-sectional view of the main part of the upper plate UB along the inclination direction shown in Figure 3. The upper second plate UB2 has a first seam portion LK1 at its upper part, which faces above the water. The first seam portion LK1 is composed of a plate bent upward and protruding. Furthermore, the second plate UB2 has a second seam portion LK2 at its lower part, which faces below the water. The second seam portion LK2 has a base portion BP2 bent upward and protruding, and a tip plate EP2 bent from the base portion BP2 toward the belowwater direction. Here, the tip plate EP2 of the second seam portion LK2 is bent downward by a predetermined angle θ. Note that, unlike the second seam portion LK2, the first seam portion LK1 does not have a tip plate bent toward the belowwater direction.

[0022] When the overlapping portion OL is overlapped, the first seam portion LK1 and the second seam portion LK2 are bent by a worker to connect the roof materials 1a and 1b together. In particular, the worker connects the two by, for example, stepping on the second seam portion LK2 with his / her foot.

[0023] Figure 5 is a cross-sectional view of a key part showing a connecting structure utilizing the first seam portion LK1 and the second seam portion LK2, where (a) shows the first step, (b) shows the second step, (c) shows the third step, and (d) shows the fourth step.

[0024] First, as shown in Figure 5(a), the worker overlaps the first upper panel UB1 of the roofing material 1a (facing the water) on the first upper panel UB1 of the roofing material 1b (facing the water), forming an overlapping portion OL. Next, as shown in Figure 5(b), the worker bends the base BP2 of the second seam portion LK2 from its base toward the water. This brings the base BP2 of the second seam portion LK2 into contact with the first seam portion LK1.

[0025] From the state shown in Figure 5(b), the worker steps on the second seam portion LK2 from directly above. As a result, as shown in Figure 5(c), the base portion BP2 of the second seam portion LK2 falls further downward in the water. At the same time, the first seam portion LK1 also falls downward in the water. Then, the tip plate EP2 of the second seam portion LK2 comes into contact with the second upper plate UB2 of the roof material 1b in the downward direction.

[0026] Here, as shown in Figure 5(c), when the tip plate EP2 of the second seam portion LK2 contacts the second upper plate UB2 of the roofing material 1b facing downwater, the tip plate EP2 extends slightly above the water from the tip of the base portion BP2. In particular, the predetermined angle θ (see Figure 4) of the second seam portion LK2 is set so that the tip plate EP2 extends above the water when it contacts the second upper plate UB2 of the roofing material 1b facing downwater. Therefore, if the worker further steps on the second seam portion LK2 from directly above, the tip plate EP2 of the second seam portion LK2 bends above the water and engages with the first seam portion LK1, as shown in Figure 5(d).

[0027] FIG. 6 is an enlarged front view of the upper plate UB shown in FIG. 2. As is clear from the above and FIG. 6, the second seam portion LK2 is formed in the second plate UB2. The same is true for the first seam portion LK1 (see FIG. 3). The first plate UB1, which is provided below the second plate UB2, has two protrusions 10 on both ends in the width direction. As already explained, the two protrusions 10 are higher than the flat portion 20. As shown in FIG. 3, the first plate UB1 of the roofing material 1a overlaps the first plate UB1 of the other roofing material 1b connected in the tilt direction, forming an overlapping portion OL. Therefore, the first plate UB1 of the roofing material 1a functions as an overlapping plate that overlaps the other roofing material 1b, and the first plate UB1 of the roofing material 1b functions as an overlapped plate that is covered by the overlapping plate.

[0028] With this structure, rainwater that falls on the roofing material 1 flows down the slope as the first plate UB1 acts like a gutter. Moreover, the first plate UB1 overlaps other roofing materials 1 that are connected in the water flow direction. Therefore, the first plate UB1 is unlikely to allow rainwater to seep in through gaps between the first plate UB1 and the first plate UB1 of a different roofing material 1. Therefore, the roofing material 1 of this embodiment is configured to allow rainwater to flow down appropriately while being connected in the slope direction.

[0029] Here, the roofing material 1 according to this embodiment also functions as an overlapping plate for the lower plate LB. As shown in FIG. 3, the lower plate LB of the roofing material 1b facing downstream overlaps the lower plate LB of the roofing material 1a facing above the water, forming an overlapping portion OL. Therefore, the lower plate LB of the roofing material 1a facing above the water overlaps the upper side of the lower plate LB of the roofing material 1b facing below the water. In addition, the lower plate LB also has ridges 10c-10f on both ends, which are higher than the flat portion 20, as shown in FIG. 2. Therefore, even if rainwater seeps into the roofing material 1, the ridges 10c-10f act like gutters, allowing the infiltrating water to flow down. Therefore, the roofing material 1 according to this embodiment is configured to allow rainwater to flow down appropriately from the lower plate LB as well.

[0030] Fig. 7 is a perspective view showing an overlapping portion OL of roofing materials according to a comparative example. As shown in Fig. 7, when roofing materials 201 with the exact same cross-sectional shape are stacked, the upper roofing material 201a is pressed in the width direction by the lower roofing material 201b, causing the flat surface 220 of the roofing material 201a to bend upward. When the upper roofing material 201a bends, wind and rain enter the gap between the roofing materials 201a and 201b, increasing the possibility of water leakage.

[0031] Therefore, the roofing material 1 according to this embodiment is configured to suppress curvature at the overlapping portion OL. Specifically, the width of the flat surface 20 of the first plate material UB1 in the roofing material 1a facing above the water as shown in Figure 3 is made smaller than the width of the flat surface 20 of the first plate material UB1 in the roofing material 1b facing below the water. This suppresses curvature between the first plate materials UB1, which are the upper plates UB.

[0032] Similarly, the width of the flat surface 20 of the lower plate LB in the roofing material 1a facing above the water as shown in Figure 3 is made smaller than the width of the flat surface 20 of the lower plate LB in the roofing material 1b facing below the water, thereby suppressing bending between the lower plates LB.

[0033] Next, we will explain the manufacturing method of the roofing material 1 according to this embodiment. Figure 8 is a process diagram showing the manufacturing method of the first plate UB1 of the roofing material 1 according to this embodiment, where (a) is the unwinding process, (b) is the cutting process, (c) is the overlapping process, (d) is the temporary fixing process, and (e) is the processing process.

[0034] First, in this embodiment, the metal plate M constituting the first plate material UB1 is wound in a coil shape, and the metal plate M is fed in a feeding step as shown in Fig. 8(a). In this way, the flat metal plate M is transported.

[0035] Next, as shown in FIG. 8(b), in the cutting process, the conveyed flat metal plate M is cut in a direction (thickness direction) that intersects with the conveyance direction. In this process, for example, the metal plate M is cut by being sandwiched between cutting members CM provided above and below the metal plate M. The cut piece that precedes the conveyance direction becomes the first metal plate MP1, and the cut piece that follows the conveyance direction becomes the second metal plate MP2. Furthermore, in this cutting process, the first metal plate MP1 is shifted in the height direction relative to the second metal plate MP2.

[0036] Then, as shown in FIG. 8(c), in the overlapping step, one end of the first metal plate MP1 and the other end of the second metal plate MP2 are overlapped by a length corresponding to the overlapping portion OL (see FIG. 3). During this process, the manufacturing equipment transports the second metal plate MP2 at a speed faster than that of the first metal plate MP1. This allows the second metal plate MP2 to catch up with the first metal plate MP1, which has shifted in the height direction during the cutting step, forming an overlapping portion D where the two are overlapped. While the overlapping portion D is formed by the first metal plate MP1 and the second metal plate MP2 being in contact with each other in FIG. 8(c), they may not be in contact with each other and may have a certain degree of clearance as long as it does not interfere with the subsequent temporary fixing step.

[0037] Next, as shown in FIG. 8(d), in a temporary fixing process, the overlapping portion D is temporarily fixed in a releasable manner to form a temporary fixed portion TF. At this time, the overlapping portion D is temporarily fixed by, for example, a spot clincher. As an example, the manufacturing device includes a punch unit PP that punches the overlapping portion D in the plate thickness direction without penetrating the first metal plate MP1 and the second metal plate MP2. The manufacturing device then temporarily fixes both the first metal plate MP1 and the second metal plate MP2 by utilizing the shape deformation that occurs when punched by the punch unit PP.

[0038] 8(e), the first metal plate MP1 and the second metal plate MP2 are processed in a processing step. In this step, the manufacturing device transports the first metal plate MP1 and the second metal plate MP2 with the overlapping portion D temporarily fixed, and performs roll forming in the roll forming unit RF. In this processing step, a first plate material UB1 having the two protrusions 10 and the flat portion 20 shown in FIG. 1 is produced.

[0039] In this way, in the manufacturing method of the roofing material 1 according to this embodiment, the roll forming process is performed while the overlapping portion D is temporarily fixed, so the cross-sectional shapes of the first plates UB1 do not completely match at the overlapping portion OL. In other words, the width of the planar portion 20 of the first plate UB1 overlapping above is smaller than the width of the planar portion 20 of the first plate UB1 overlapping below.

[0040] Meanwhile, in a separate process not shown, a second plate material UB2 having a first seam portion LK1 and a second seam portion LK2 is prepared. Then, the second plate material UB2 is placed on the first plate material UB1 and fixed by welding or the like to form the upper plate UB. In the upper plate UB as described above, the curvature at the overlapping portion OL is eliminated. If possible, the first seam portion LK1 and the second seam portion LK2 may be attached to the first plate material UB1 by welding or the like.

[0041] Next, a method for manufacturing the lower plate LB will be described. Figure 9 is a process diagram showing the method for manufacturing the lower plate LB of the roofing material 1 according to this embodiment, where (a) is the second feeding step, (b) is the second cutting step, (c) is the second overlapping step, (d) is the second temporary fixing step, and (e) is the second processing step.

[0042] First, as shown in FIG. 9(a), the metal plate M constituting the lower plate LB is wound in a coil shape, and the metal plate M is fed in a second feeding step as shown in FIG. 9(a). As a result, the flat metal plate M is transported. Next, the metal plate M is cut in a second cutting step (see FIG. 9(b)). At this time, the cut part preceding the transport direction becomes the third metal plate MP3, and the cut part following the transport direction becomes the fourth metal plate MP4. Furthermore, in this second cutting step, the third metal plate MP3 is shifted in the height direction relative to the fourth metal plate MP4.

[0043] Next, as shown in FIG. 9(c), in the second overlapping step, one end of the third metal plate MP3 and the other end of the fourth metal plate MP4 are overlapped by a length corresponding to the overlapping portion OL (see FIG. 3), forming a second overlapping portion D2. During this process, the manufacturing equipment transports the succeeding fourth metal plate MP4 at a speed faster than that of the preceding third metal plate MP3. This allows the fourth metal plate MP4 to catch up with the third metal plate MP3, which has shifted in the height direction in the cutting direction, thereby forming the second overlapping portion D2 where the two are overlapped. Note that the third metal plate MP3 and the fourth metal plate MP4 may be spaced apart from each other within a range that does not interfere with the subsequent second temporary fixing step.

[0044] 9(d), in a second temporary fixing step, the second overlapping portion D2 is temporarily fixed in a releasable manner to form a second temporary fixed portion TF2. At this time, the second overlapping portion D2 is temporarily fixed by, for example, a spot clincher in the same manner as described above.

[0045] 9(e), the third metal plate MP3 and the fourth metal plate MP4 are processed in the second processing step. In this step, the manufacturing device transports the third metal plate MP3 and the fourth metal plate MP4 with the second overlapping portion D2 temporarily fixed, and performs roll forming. In this second processing step, a lower plate LB having a predetermined shape is produced.

[0046] This makes it possible to prevent the lower plate LB from curving at the overlapping portion OL in the same manner as the upper plate UB.

[0047] Fig. 10 is a perspective view showing a part of a manufacturing apparatus for manufacturing the first plate material UB1 by carrying out the steps shown in Fig. 8. Note that Fig. 10 shows a part of the manufacturing apparatus for manufacturing the first plate material UB1, but the same applies to the manufacturing apparatus for manufacturing the lower plate LB.

[0048] As shown in FIG. 10, the manufacturing apparatus 100 includes conveying rollers 110 and 120, a traveling cutting shear 130, and a traveling spot clincher 140.

[0049] The first conveying rollers 110 convey the metal sheet M conveyed from upstream to the traveling cutting shear 130. The second conveying rollers 120 convey the metal sheet M downstream to the roll forming section RF (see FIG. 8(e)).

[0050] The traveling cutting shear 130 has a cutting member CM as shown in Figures 8(b) and 10 and is movable along the conveyance direction. The traveling cutting shear 130 cuts the metal sheet M by operating the cutting member CM while moving in accordance with the conveyance speed of the metal sheet M. As a result of cutting by this traveling cutting shear 130, a first metal sheet MP1 leading in the conveyance direction and a second metal sheet MP2 following in the conveyance direction are formed.

[0051] The first metal plate MP1 cut by the traveling cutting shear 130 is transported by the second transport rollers 120, and the second metal plate MP2 is transported by the first transport rollers 110. Here, the rotation speed of the first transport rollers 110 is set higher than the rotation speed of the second transport rollers 120. As a result, the second metal plate MP2 is transported so as to catch up with the first metal plate MP1, and an overlapping portion D (see FIG. 8(c)) corresponding to the length of the overlapping portion OL (see FIG. 3) is formed.

[0052] The traveling spot clincher 140 has a punch portion PP as shown in Figure 8(d) and is movable along the conveying direction. The traveling spot clincher 140 operates the punch portion PP while moving in accordance with the conveying speed of the overlap portion D, thereby temporarily fixing the first metal plate MP1 and the second metal plate MP2 together. As shown in Figure 10, the traveling spot clincher 140 is configured to temporarily fix the first metal plate MP1 and the second metal plate MP2 near their widthwise ends.

[0053] After being temporarily fixed, the first metal plate MP1 and the second metal plate MP2 are transported to the roll forming section RF shown in FIG. 8(e), where the first plate material UB1 as shown in FIGS. 1 and 2 is formed.

[0054] In this way, with the roofing material 1 according to this embodiment, when connected along the slope, the first seam portion LK1 and the second seam portion LK2 are not bent at the location where the insulating material I is present, and so-called flat seams can be formed. Furthermore, the roofing material 1 has the first plate material UB1 and the lower plate LB below the first seam portion LK1 and the second seam portion LK2, and the first plate material UB1 and the lower plate LB are higher than the flat portion 20 sandwiched between the protrusions 10a to 10f at both lateral ends. For this reason, a gutter-like structure can be formed with the first plate material UB1 and the lower plate LB, allowing rainwater to flow down and reducing the possibility of leakage. Therefore, It is possible to provide a roofing material 1 that can be suitably connected and allows rainwater to flow off appropriately even in a sandwich panel structure having a heat insulating material I.

[0055] Furthermore, in the roofing material 1 according to this embodiment, the width of the flat portions 20 sandwiched between the ridges 10a-10f is wider at the bottom than at the top. If the widths of the flat portions 20 were different, for example, if they were the same, the overlying plate would bend upward as it was sandwiched between the ridges 10a-10f of the underlying plate. However, if the width of the flat portions 20 sandwiched between the ridges 10a-10f is wider at the bottom than at the top, the bending is suppressed. This reduces the possibility of wind and rain entering gaps created by the bending, resulting in water leakage.

[0056] Furthermore, since the roofing material 1 of this embodiment has a two-plate structure in which the upper plate UB is made of a first plate material UB1 and a second plate material UB2, the connecting structure and a rainwater flow structure such as a gutter can be formed using only the upper plate UB.

[0057] The present disclosure has been described above based on the embodiments, but the present disclosure is not limited to the above embodiments, and modifications may be made within the scope of the spirit of the present disclosure, and publicly known or well-known technologies may be combined to the extent possible.

[0058] For example, the roofing material 1 is not limited to the above and can be modified in various ways. That is, although the roofing material 1 has a two-plate structure in which the upper plate UB is made of a first plate UB1 and a second plate UB2, the roofing material 1 is not limited to this and may be made of, for example, only the second plate UB2. In this case, the protrusions 10 may be made of a separate plate, and the separate plate may be connected to the second plate UB2 by welding or the like, or may be formed on the second plate UB2.

[0059] Furthermore, in the roofing material 1, the lower plate LB also functions as an overlap plate and acts as a water catcher like a gutter, but is not limited to this and may be made of, for example, a flat plate. Furthermore, in the roofing material 1, the width of the flat portion 20 is not adjusted to suppress curvature, and for example, gaps that occur in the curved part may be closed by another means such as an adhesive, or the curvature may be suppressed by the adhesive, etc.

[0060] Additionally, the upper plate UB of the roofing material 1 may also have three or more ridges 10, or may have a structure in which the flat surface portion 20 has two or more stages of flat surface portions 20 with different heights.

[0061] Furthermore, in the above embodiment, temporary fixing portions TF, TF2 are formed by traveling spot clincher 140. However, this is not limiting, and temporary fixing portions TF, TF2 may be formed by bonding with a thermoplastic adhesive and released by heating. Similarly, temporary fixing portions TF, TF2 may be formed by a fixture attached in a position that does not interfere with the roll forming process and released by removing the fixture. [Explanation of symbols]

[0062] 1, 1a, 1b: Roofing materials 10,10a~10f: Projection 20: Flat part BP1,BP2: Base EP1, EP2: End plate I: Insulation material LB: Lower plate (overlapped plate, overlapped plate) LK1: First seam LK2: Second seam OL: Overlapped area UB: Upper plate UB1: First plate (overlap plate, overlapped plate) UB2: 2nd plate material

Claims

1. A roofing material of sandwich panel structure comprising an upper plate that becomes the upper side when installed on a building, a lower plate that becomes the lower side, and a heat insulating material provided between the upper plate and the lower plate, The upper plate has a first seam portion that protrudes upward at an upper portion that is above the slope of the roof, and a second seam portion that protrudes upward at a lower portion that is below the slope of the roof and has a tip that is bent downward toward the slope, An overlap plate is provided below the first seam portion and the second seam portion and overlaps another roof material connected to the lower side in the slope direction of the roof, The overlap plate has both ends on the sides perpendicular to the inclination direction that are higher than the portion sandwiched by the both ends. A roofing material characterized by:

2. The overlapping plate and the overlapped portion of the other roofing material where the overlapping plate overlaps have a cross section in the inclination direction that is approximately the same shape, and the width of the portion sandwiched between the both ends is wider at the bottom than at the top.

2. The roofing material according to claim 1.

3. The upper plate includes a plate material including the first seam portion and the second seam portion, and a plate material including the overlap plate provided in contact with the lower surface of the plate material.

2. The roofing material according to claim 1.

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