Roof joint structure and method for constructing the same

Abstract

To provide a roof joint structure which holds waterproof performance and has beauty at a joint of divided unit roofs, and a method for constructing the same.SOLUTION: A roof joint structure comprises a waterproof tape 20 that covers a joint edge part 15 of adjacent roof units 10, 10, and a joint roof material 21 laid over the waterproof tape 20. Multiple joint roof materials 21 are provided along the joint edge part 15, and the horizontal butt joint position of a roof material 14 and the joint roof material 21 on the higher side of the roof gradient is offset horizontally with respect to the butt joint position of the adjacent roof materials 14 on the lower side of the roof gradient and the joint roof material 21. The lower side edge part of the joint roof material 21 on the higher side of the roof gradient covers the upper surface of the higher side edge part of the adjacent joint roof materials 21 on the lower side, and the side edge part 24 of the higher side edge part of the joint roof material 21 (second joint roof material 23) is inserted into the lower side of the side edge part 18 closer to the joint edge part 15 of the roof material 14 (outside roof material 14a).SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a roof joint structure and a method for constructing the same. [Background technology]

[0002] In the past, the conventional method of assembling materials on-site was the norm for house construction, but prefabricated construction, in which units are formed in a factory and then assembled on-site, is attracting attention. Prefabricated construction was carried out by house manufacturers who supplied a large number of standardized buildings, but in recent years it has been spreading to general builders as well. Prefabricated construction allows for simple construction, allows the supply of high-quality housing regardless of the skill level of the workers, and shortens construction time.

[0003] In conventional prefabricated construction methods, if roofing materials are laid on the roof before assembly, waterproofing at the joints of the roof is difficult, so the units often only include underlayment and no roofing materials. However, in recent years, a construction method has been developed in which roofing materials are laid on divided roofs in advance to form units, and these roof units are assembled at the construction site to waterproof the joints of the roof (see, for example, Patent Document 1). At the joints of the roof in Patent Document 1, wooden square timbers are installed along the joint edges. After the roof units are assembled, waterproof tape is laid across the adjacent wooden square timbers, and a cover metal sheet is placed on top of it. Note that the waterproof tape may not be laid. The roofing materials are laid up to the vicinity of the side edges of the wooden square timbers. At such joints of the roof, the gaps between the roof units are covered with a cover metal sheet, so that the waterproofing of the roof joints can be ensured. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2008-57256 A Summary of the Invention [Problem to be solved by the invention]

[0005] In the structure of Patent Document 1, two wooden beams are lined up at the roof joint and covered with a metal cover, so a protrusion is formed along the joint. In other words, the continuity of the roof material is lost, and there is a problem that the aesthetics are deteriorated.

[0006] Therefore, an object of the present invention is to provide a roof joint structure that has an aesthetic appearance while ensuring waterproof performance at the joints of divided unit roofs, and a method for constructing the same. [Means for solving the problem]

[0007] The first invention for solving the above-mentioned problem is a roof joint structure for joining roof units which have roof material laid in advance up to the vicinity of the joint edge, comprising a waterproof tape covering the joint edge between adjacent roof units, and a joining roof material laid on top of the waterproof tape, wherein the joining roof material is provided in multiple sheets along the joint edge, the lateral butt position between the roof material on the upstream side of the roof slope and the joining roof material is offset laterally from the lateral butt position between the adjacent roof material and the joining roof material on the downstream side of the roof slope, the downstream end of the joining roof material on the upstream side of the roof slope covers the upper surface of the upstream end of the joining roof material adjacent to the downstream side, and the side edge of the upstream end of the joining roof material is inserted under the side edge of the roof material closer to the joint edge.

[0008] According to the roof joint structure of the present invention, the joint edges between the roof units are covered with waterproof tape, and the joint roof material is laid on top of the waterproof tape, so that waterproof performance can be ensured. In addition, since the butt positions arranged on the roof slope are offset laterally, the downstream roof material or the joint roof material is located below the butt position, so that waterproof performance is improved. Meanwhile, since the roof material and the joint roof material are laid continuously, the continuity of the roof material is ensured, and the aesthetic appearance is improved. Furthermore, since the side edge of the roof material near the joint edge covers the side edge of the upstream end of the joint roof material, waterproof performance is further improved, and the continuity between the roof material and the joint roof material is increased, so that the aesthetic appearance is further improved.

[0009] In the roof joint structure of the present invention, it is preferable that the side edge of the roof material near the joint edge is elastically deformable upward and away from the base material. With this configuration, the side edge of the roof material near the joint edge can be turned up and the side edge of the upstream end of the joint roof material can be inserted, making construction easier.

[0010] The second invention for solving the above-mentioned problem is a method for constructing a roof joint structure to join roof units which have roof material laid in advance up to the vicinity of the joint edge, comprising a waterproof tape laying step of covering the joint edge of adjacent roof units with waterproof tape, and a joint roof material laying step of laying the joint roof material on top of the waterproof tape, wherein in the joint roof material laying step, after the joint roof material on the downstream side of the roof slope is laid, the joint roof material on the upstream side is laid in sequence, so that the downstream end of the joint roof material on the upstream side of the roof slope covers the upper surface of the upstream end of the adjacent joint roof material on the downstream side, and the side edge of the upstream end of the joint roof material is inserted under the side edge of the roof material closer to the joint edge and covered with the side edge of the roof material closer to the joint edge. This is a method for constructing a roof joint structure, characterized in that

[0011] According to the method for constructing a roof joint structure of the present invention, the joint edges of the roof units are covered with waterproof tape, and then the joint roof material is laid on top of the waterproof tape, so that waterproof performance can be ensured. In addition, the roof material and the joint roof material are laid continuously, so that the continuity of the roof material can be ensured and the aesthetic appearance is improved.

[0012] In the method for constructing a roof joint structure of the present invention, in the step of laying the joint roofing material, it is preferable to roll up the side edge of the roofing material close to the joint edge, insert the side edge of the upstream end of the joint roofing material, and return the side edge of the roofing material close to the joint edge to a flat state so as to cover the side edge of the upstream end of the joint roofing material. This method makes it easier to insert the side edge of the upstream end of the joint roofing material, and improves the continuity between the roofing material and the joint roofing material, thereby further improving the aesthetic appearance. Effect of the Invention

[0013] According to the roof joint structure and the method for constructing the same of the present invention, it is possible to maintain a beautiful appearance while ensuring waterproof performance at the joints of divided unit roofs. [Brief description of the drawings]

[0014] [Figure 1] FIG. 2 is a side view showing a roof joint structure according to an embodiment of the present invention. [Diagram 2] 1 is a side view showing the state in which a roof unit of a roof joint structure according to an embodiment of the present invention is installed. [Diagram 3] 1 is a side view showing a roof unit installation process of a method for constructing a roof joint structure according to an embodiment of the present invention. FIG. [Figure 4] FIG. 2 is a side view showing the waterproof tape laying process of the method for constructing a roof joint structure according to an embodiment of the present invention. [Diagram 5] FIG. 1 is a side view showing the connecting roof material laying process of the method for constructing a roof joint structure according to an embodiment of the present invention, where (a) is a side view showing the state where the first connecting roof material is installed, and (b) is a side view showing the state where the second connecting roof material is installed. [Figure 6]FIG. 1 is a side view showing the connecting roof material laying process of the method for constructing a roof joint structure according to an embodiment of the present invention, where (a) is a side view showing the state after the second connecting roof material has been installed, and (b) is a side view showing the state after the upper first connecting roof material has been installed. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] A roof joint structure and a method for constructing the same according to an embodiment of the present invention will be described in detail with reference to the drawings. First, the configuration of the roof joint structure will be described. The roof joint structure according to this embodiment joins together roof units on which roofing materials have been laid in advance up to the vicinity of the joint edge. The roof units are formed in advance in a factory and transported from the factory to the construction site by a transport vehicle such as a truck.

[0016] As shown in FIG. 2, the roof unit 10 is hung by a crane and installed on the roof 3 of a building 2 such as a house. The roof unit 10 is installed on the wall panel 4 of the top floor in the roof 3. As also shown in FIG. 3, the roof unit 10 is constructed by laying an underlayment 13 and a roof material 14 on a base panel 12 stretched on a roof frame 11. The roof frame 11 includes a rafter erected on a rafter, and a ridgepole and a purlin material hung on the rafter, and supports the base panel 12 in a state inclined in the direction of the roof slope. A plurality of roof units 10 are provided and are connected along the extension direction of the purlin material (hereinafter sometimes referred to as the "horizontal direction"). The vertical edge along the roof slope of the parts where adjacent roof units 10, 10 are joined to each other becomes the joint edge 15 between the roof units 10, 10. The underlayment material 13 is a waterproof sheet laid under the roof material 14, and is laid over the entire surface of the roof on which the roof material 14 is laid.

[0017] The roofing material 14 is, for example, a plate material formed by impregnating and coating a glass substrate with asphalt. The roofing material 14 has characteristics such as excellent waterproofness, light weight, softness, and resistance to cracking. The material of the roofing material 14 is only an example and is not limited to the above configuration. A plurality of roofing materials 14 are arranged along the roof slope, and the downstream end of the upstream roofing material 14 (in this embodiment, a range slightly wider than the downstream half) is arranged so as to cover the upstream end of the downstream roofing material 14 (in this embodiment, a range slightly wider than the upstream half). The downstream tip, which is a part of the downstream end of the upstream roofing material 14, also overlaps the upstream tip of the roofing material 14 further downstream of the downstream roofing material 14 (the roofing material 14 on the second downstream side), so that the roofing materials 14 are triple-layered (see FIG. 5(a)). The roofing material 14 is laid on the surface of the roof unit 10 except for the joint edge portion 15. In other words, the roof material 14 is laid from the lateral middle part of the roof unit 10 to the vicinity of the joint edge 15 .

[0018] The butt positions of the roof materials 14, 14 adjacent in the horizontal direction are alternately offset in the horizontal direction from the upstream side to the downstream side of the roof slope. The butt positions of the roof materials 14, 14 arranged at intervals in the vertical direction of the roof slope are arranged on the same straight line. The end 17 of the roof material 14 on the joint edge 15 side is alternately offset in the horizontal direction from the upstream side to the downstream side of the roof slope, similar to the butt positions of the roof materials 14, 14. The end 17 of the roof material 14 on the joint edge 15 side arranged at intervals in the vertical direction of the roof slope is arranged on the same straight line. In other words, the end 17 of the roof material 14 on the joint edge 15 side is located in two places: close to the joint edge 15 and a certain distance (offset length) away from the joint edge 15. Hereinafter, when distinguishing between roofing materials 14 having different positions of the end 17, the roofing material 14 having the end 17 in a position close to the joint edge 15 may be referred to as the "outer roofing material 14a", and the roofing material 14 having the end 17 at a position a certain distance (offset length) away from the joint edge 15 may be referred to as the "inner roofing material 14b". The side edge 18 near the joint edge 15 of the outer roofing material 14a is formed to be elastically deformable upwardly away from the underlayment 13 (base material). The elastically deformable part is composed of a member formed by, for example, impregnating and coating a glass substrate with asphalt. The elastically deformable part of the outer roofing material 14a may be only the side edge 18, or may be the entire outer roofing material 14a.

[0019] The roof joint structure 1 of this embodiment includes a waterproof tape 20 laid on the joint edges 15, 15 of adjacent roof units 10, 10, and a joint roof material 21 laid on the waterproof tape 20.

[0020] The waterproof tape 20 covers the joint edges 15, 15 of the adjacent roof units 10, 10 and also covers the clearance between the adjacent roof units 10, 10, and is laid across the joint edges 15, 15 on both sides. The waterproof tape 20 extends vertically over the entire length of the joint edge 15 and is adhered to the joint edge 15.

[0021] The joining roof material 21 is a roof material that is installed on-site at the joint between adjacent roof units 10, 10, and is placed on the waterproof tape 20 in a position that covers the clearance between the adjacent roof units 10, 10. The joining roof material 21 is composed of a first joining roof material 22 and a second joining roof material 23 that are different in size.

[0022] The first connecting roof material 22 is a connecting roof material 21 that is butted against the end 17 of the outer roof material 14a (the end 17 at a position close to the joint edge 15). The first connecting roof material 22 has the same vertical dimension as the roof material 14, and is rectangular in shape with a horizontal dimension equivalent to the distance between the end 17 of the outer roof material 14a and the end 17 of the adjacent outer roof material 14a. Both horizontal ends of the first connecting roof material 22 are butted against the ends 17 of the adjacent outer roof materials 14a on both sides, respectively.

[0023] The second connecting roof material 23 is a connecting roof material 21 that is butted against the end 17 of the inner roof material 14b (the end 17 at a certain distance from the connecting edge 15). The second connecting roof material 23 has the same vertical dimension as the roof material 14. The second connecting roof material 23 has a horizontal dimension equivalent to the distance between the end 17 of the inner roof material 14b and the end 17 of the adjacent inner roof material 14b. In other words, the second connecting roof material 23 has a rectangular shape with a vertical dimension the same as that of the first connecting roof material 22 and a horizontal dimension larger than that of the first connecting roof material 22. Both horizontal ends of the second connecting roof material 23 are butted against the ends 17 of the adjacent inner roof materials 14b on both sides.

[0024] The first connecting roof material 22 and the second connecting roof material 23 are arranged alternately along the roof slope. The downstream end (in this embodiment, a range slightly wider than the downstream half) of the upstream connecting roof material 21 (first connecting roof material 22 (or second connecting roof material 23)) is arranged so as to cover the upstream end (in this embodiment, a range slightly wider than the upstream half) of the downstream connecting roof material 21 (second connecting roof material 23 (or first connecting roof material 22)). The downstream tip, which is a part of the downstream end of the upstream connecting roof material 21, also overlaps the upstream tip of the connecting roof material 14 (the connecting roof material 14 two steps downstream) further downstream of the downstream connecting roof material 21, so that the connecting roof materials 21 are triple-overlapped (see FIG. 1 and FIG. 6(b)).

[0025] In detail, the downstream end of the roof slope of the first connecting roof material 22 (in this embodiment, an area slightly wider than the downstream half) covers the upper surface of the lateral middle part of the upstream end of the adjacent second connecting roof material 23 on the downstream side (in this embodiment, an area slightly wider than the upstream half) on the waterproof tape 20. The upstream end of the roof slope of the first connecting roof material 22 is laid on the waterproof tape 20 and covered by the downstream end of the adjacent second connecting roof material 23 on the upstream side. The end 17 of the outer roof material 14a is the butt position of the roof material 14 and the first connecting roof material 22.

[0026] The downstream end of the roof slope of the second connecting roof material 23 (in this embodiment, a range slightly wider than the downstream half) covers the upper surface of the upstream end of the first connecting roof material 22 adjacent to the downstream side (in this embodiment, a range slightly wider than the upstream half) and the upper surface of the upstream end of the edge of the outer roof material 14a adjacent to both sides in the lateral direction of the first connecting roof material 22. The lateral middle part of the upstream end of the roof slope of the second connecting roof material 23 is covered by the downstream end of the first connecting roof material 22 adjacent to the upstream side. The side edges 24 on both sides of the upstream end of the roof slope of the second connecting roof material 23 are inserted under the downstream end (on the base panel 12 side) of the side edge 18 near the joint edge 15 of the outer roof material 14a adjacent to both sides in the lateral direction to the first connecting roof material 22 adjacent to the upstream side. In other words, the upper surfaces of the side edges 24 on both sides of the upstream end of the roof slope of the second connecting roof material 23 are covered by the side edges 18 of the outer roof material 14a. The end 17 of the inner roof material 14b is the butt position of the roof material 14 and the second connecting roof material 23.

[0027] As explained above, the butt position (end 17 of the outer roofing material 14a) of the outer roofing material 14a and the first connecting roofing material 22 is offset laterally from the butt position (end 17 of the inner roofing material 14b) of the inner roofing material 14b and the second connecting roofing material 23. In other words, the butt position in the lateral direction between the roofing material 14 on the upstream side of the roof slope and the connecting roofing material 21 is offset laterally from the butt position in the lateral direction between the adjacent roofing material 14 on the downstream side of the roof slope and the connecting roofing material 21.

[0028] Next, we will explain the method for constructing the above-mentioned roof joint structure 1. The method for constructing the roof joint structure 1 according to this embodiment is a method for joining roof units 10, 10 installed on the roof portion 3 of a building 2 such as a house, and includes a waterproof tape laying step and a joining roof material laying step.

[0029] The waterproof tape laying process is a process of covering the joint edges 15, 15 of adjacent roof units 10, 10 with a waterproof tape 20, as shown in Fig. 4. In the waterproof tape laying process, the waterproof tape 20 is laid across the joint edges 15, 15 on both sides so as to cover the clearance between the roof units 10, 10. The waterproof tape 20 is placed in contact with the left and right joint edges 15, 15 with the same width, and laid over the entire vertical length of the joint edges 15. In this way, the waterproof tape 20 is laid over almost the entire surface between the left and right outer roof materials 14a, 14a.

[0030] The joint roofing material laying process is a process of laying a joint roofing material 21 on a waterproof tape 20, as shown in Figures 5 and 6. In the joint roofing material laying process, after laying the joint roofing material 21 on the downstream side of the roof slope, the joint roofing material 21 on the upstream side is laid in sequence, and the downstream end of the joint roofing material 21 on the upstream side of the roof slope covers the upper surface of the upstream end of the joint roofing material 21 adjacent to the downstream side. Specifically, as shown in Figure 5 (a), first, the first joint roofing material 22 is installed between the ends 17, 17 of the outer roofing materials 14a, 14a adjacent to each other on the left and right, and the left and right ends of the first joint roofing material 22 are butted against each end 17, 17. At this time, the first joint roofing material 22 is laid on the waterproof tape 20.

[0031] Next, as shown in Fig. 5(b), the second connecting roof material 23 is laid. The second connecting roof material 23 is laid in a horizontal position between the ends 17, 17 of the inner roof materials 14b, 14b at a vertical position where it overlaps with the upstream end of the first connecting roof material 22 laid in Fig. 5(a). At this time, the side edges 18, 18 near the joint edge 15 of the outer roof materials 14a, 14a located upstream of the inner roof materials 14b, 14b are rolled up upward, and the side edges 24 on both sides of the upstream end of the roof slope of the second connecting roof material 23 are inserted into the part where the side edges 18, 18 have been rolled up.

[0032] Then, as shown in FIG. 6(a), the side edges 18, 18 are released from being rolled up and returned to their original flat state, and the side edge 18 of the outer roofing material 14a is placed over the upper surface of the side edge 24 of the second connecting roofing material 23. In this state, the downstream end of the left-right middle part of the second connecting roofing material 23 covers the upstream end of the first connecting roofing material 22. Meanwhile, the end 17 of the outer roofing material 14a is the butt position of the roofing material 14 (outer roofing material 14a) and the first connecting roofing material 22, and the end 17 of the inner roofing material 14b is the butt position of the roofing material 14 (inner roofing material 14b) and the second connecting roofing material 23. Then, the butt positions of the outer roofing material 14a and the first connecting roofing material 22 and the butt positions of the inner roofing material 14b and the second connecting roofing material 23 are offset from each other in the horizontal direction.

[0033] Next, as shown in Fig. 6(b), the upstream first connecting roof material 22 is laid. As in Fig. 5(a), the first connecting roof material 22 is installed between the ends 17, 17 of the outer roof materials 14a, 14a adjacent to each other on the left and right, and both left and right ends of the first connecting roof material 22 are butted against the ends 17, 17. The downstream end of the first connecting roof material 22 covers the upstream end of the left-right middle part of the second connecting roof material 23.

[0034] After that, the second connecting roof material 23 and the first connecting roof material 22 are installed alternately in the above-mentioned procedure. The connecting roof material 21 (which is the second connecting roof material 23 in this embodiment) installed at the upper end of the roof slope is placed with its entire surface exposed. Finally, a roof coping is installed to cover the upstream end of the connecting roof material 21.

[0035] The effects of the roof joint structure 1 of this embodiment and the method for constructing it will be described below. According to the roof joint structure 1 of this embodiment, the joint edges 15, 15 between the roof units 10, 10 are covered with the waterproof tape 20, and the joint roof material is laid on the waterproof tape, so that waterproof performance can be ensured. In addition, since the butt position between the roof material 14 and the joint roof material 21 is offset laterally, the downstream roof material 14 or the joint roof material 21 is located below the butt position, so that waterproof performance is improved. On the other hand, since the roof material 14 and the joint roof material 21 are laid continuously, the continuity of the roof materials 14, 21 can be ensured over the entire roof surface, and the aesthetic appearance is improved. Furthermore, the side edge 18 near the joint edge 15 of the outer roof material 14a covers the side edge 24 of the upstream end of the second joint roof material 23, so that the waterproof performance is further improved, and the continuity between the roof material 14 and the joint roof material 21 is increased, and the aesthetic appearance is further improved.

[0036] Furthermore, since there are two types of joining roof materials 21, the first joining roof material 22 and the second joining roof material 23, which have different widths, they can be installed butted together between the outer roof materials 14a, 14a and between the inner roof materials 14b, 14b. This can further improve both waterproof performance and aesthetics at the same time.

[0037] In addition, since the side edge 18 of the outer roof material 14a near the joint edge 15 is elastically deformable, the side edge 18 can be rolled up and the side edge 24 of the upstream end of the second joint roof material 23 can be inserted under the side edge 18. This makes it easier to install the joint roof material 21.

[0038] According to the construction method of the roof joint structure 1, the waterproof performance of the roof can be ensured and the aesthetic appearance can be improved, similarly to the roof joint structure 1. Furthermore, the construction work of the roof can be reduced, so the construction time can be shortened. In particular, in the joint roof material laying process, the side edge 18 near the joint edge 15 of the outer roof material 14a is rolled up, the side edge 24 of the upstream end of the second joint roof material 23 is inserted, and the side edge 18 of the outer roof material 14a is returned to a flat state and covered with the side edge 24 of the upstream end of the second joint roof material 23, so that the installation and construction of the joint roof material 21 is easy.

[0039] The above describes the embodiment for carrying out the present invention, but the present invention is not limited to the above embodiment, and the design can be appropriately changed within the scope of the present invention. In the above embodiment, the side edge portion 18 of the outer roof material 14a is elastically deformable, but the present invention is not limited to this, and the outer roof material 14a may be non-elastically deformable. In this case, the side edge portion 18 of the outer roof material 14a is lifted to lift the entire outer roof material 14a at an angle, and the side edge portion 24 of the second joint roof material 23 is inserted under the side edge portion 18 of the outer roof material 14a. Even with such a configuration, a roof joint structure 1 of a similar shape can be constructed. [Explanation of symbols]

[0040] 1 Roof joint structure 10 Roof unit 14 Roofing materials 14a Exterior roofing material 14b Inner roofing material 15 Joint Edge 17 End 18 Side edge (side edge near the joint edge of the roof material) 20 Waterproof Tape 21 Joint roofing materials 22 First joint roofing material 23 Second joint roof material 24 Side edge (side edge of upstream end of joint roof material)

Claims

1. A roof joint structure for joining roof units in which roof materials have been laid in advance up to the vicinity of the joint edge, The roof unit is provided with a waterproof tape that covers the joint edges between adjacent roof units, and a joint roof material that is laid on the waterproof tape, The joint roof material is provided in a plurality of pieces along the joint edge portion, The lateral butting position of the roof material and the joint roof material on the upstream side of the roof slope is offset laterally with respect to the lateral butting position of the adjacent roof material and the joint roof material on the downstream side of the roof slope; The downstream end of the joint roof material on the upstream side of the roof slope covers the upper surface of the upstream end of the joint roof material adjacent to the downstream side, The side edge of the upstream end of the joint roof material is inserted under the side edge of the roof material closer to the joint edge. A roof joint structure characterized by:

2. The side edge portion of the roof material near the joint edge portion is elastically deformable upwardly away from the base material.

2. The roof joint structure according to claim 1 .

3. A method for constructing a roof joint structure in which roof units each having a roof material laid thereon up to the vicinity of a joint edge are joined together, comprising the steps of: a waterproof tape laying step of covering the joint edges of adjacent roof units with waterproof tape; and a joint roofing material laying step of laying a joint roofing material on the waterproof tape, In the joint roofing material laying process, the joint roofing material on the downstream side of the roof slope is laid, and then the joint roofing material on the upstream side is laid in sequence, and the downstream end of the joint roofing material on the upstream side of the roof slope covers the upper surface of the upstream end of the adjacent joint roofing material on the downstream side, and the side edge of the upstream end of the joint roofing material is inserted under the side edge of the roof material closer to the joint edge and covered by the side edge of the roof material closer to the joint edge. A method for constructing a roof joint structure.

4. In the joint roofing material laying step, the side edge of the roofing material near the joint edge is rolled up, the side edge of the upstream end of the joint roofing material is inserted, and the side edge of the roofing material near the joint edge is returned to a flat state so as to cover the side edge of the upstream end of the joint roofing material. A method for constructing a roof joint structure according to claim 3.

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