JPH03166457A - Transversely shingling roof structure - Google Patents

Abstract

PURPOSE:To simplify constitution itself by fixing the fixing projection of a lower stage edge-side transversely shingling roof board member to the fixing groove of the mounting piece of a rafter member, and inserting the engaging projection of the upper stage edge-side transversely shingling roof board member into an engaging groove. CONSTITUTION:On a transversely shingling roof board member 1, there are installed a face board part 2, a edge-side molded part 3, and an eaves-side molded part 4. Moreover, the rafter member 21 is provided with each pressing piece 22 to form a fixing groove 23. Next, the molded part 4 of the upper member 1 is made to hang over the pressing piece 22 of the member 21, and also the molded part 3 of the lower member 1 is inserted. Next, the pressing piece 22 is inserted between the engaging turn-up part 5 of the lower stage member 1 and a fixing projection 9, and the projecting piece 9 is opposed to the groove 23. And the molded part 4 is pressed down, and the lower stage member 1 is drawn to the eaves side so as to set the projection 9 in the groove 23 and the engaging projection 12 in an engaging groove 6, respectively. Accordingly, it can be simplified and the cost is reduced.

Description

[Detailed description of the invention]

[Industrial Application Field 1] The present invention relates to a horizontal roof structure in a building, and more particularly, to engaging horizontal roof plate members with each other and fixing a retaining portion on a rafter member. In a horizontal roof that is successively roofed from the ridge side to the eave side, the engagement between the horizontal roof board member located on the upper ridge side and the horizontal roof board member located on the lower eave side, and the stop structure or part. The purpose of this project is to improve the horizontal roof structure so that the height of the roof can be reduced as much as possible, and also to make it easier to install the roof.

[Conventional technology]

In the horizontal roof structure of a building, the construction method that enables roofing construction by sequentially engaging the horizontal roof plate members from the ridge side to the eave side, that is, from the top to the bottom, includes the following method: There is a method called the "packing method" proposed by the present inventor, and many proposals have already been made because it has various advantages during and after roofing construction. As is well known, the general type of horizontal roof structure using this type of packing method is to leave a face plate in the center along the longitudinal direction of a long thin metal sheet, and Using the required number of horizontal roofing board members, each with a ridge-side molded part on one side and an eave-side molded part on the other side, and appropriate hanging members, first place them on the upper ridge side. A backup material such as wood wool cement board is interposed between the horizontal roofing board member (hereinafter simply referred to as the upper horizontal roofing board member) and the roof base, and the upper horizontal roofing board member is The corresponding part of the eave side molded part is temporarily held in place with the end of the backup material by the hanger member, and then the lower part is attached to the eave side molded part of the upper horizontal roof board member. After engaging the ridge side molded part of the horizontal roofing board member placed on the eave side (hereinafter simply referred to as the lower horizontal roofing board member) from the inside from below, the hanger member is attached to the rafter on the roof base side. By fixing it to a member, etc., and then inserting a backup material between the lower side horizontal roofing board member and the roof base, and repeating the above operations in sequence, the desired result can be achieved. Then, each horizontal roof board member is thatched from the ridge side to the eave side. In addition, as another similar type, the ridge side molding part of the lower horizontal roof board member is engaged from the inside with the eave side molding part of the upper horizontal roof board member, and the rafter member on the roof base side is The molded part of the ridge side of the lower horizontal roof plate member is pressed from above to the hanger member fixed to the hanger member, etc., so that it fits elastically, and as in the previous example, each of these horizontal roof plate members A method has also been proposed in which the roof shingles are raised from the ridge side to the eave side. [Problem to be solved by the invention] A conventional horizontal roof structure in which horizontal roof board members are roofed from the ridge side to the eave side is configured as described above.
The main points when applying the former type of packing method are:
After all, the space for the back-up material that supports the face plate part of the horizontal roofing board member made of metal thin steel plates from the back side is used as the suspension member that is secured to the eave side molding part of the upper horizontal roofing board member. , and as an operating space for securing the ridge side molded part of the lower side horizontal roofing board member, thereby making it possible to raise the roof from the ridge side to the eave side as planned. On the one hand, this horizontal roof structure has a variety of extremely excellent performances. After roofing, the engagement structure of the upper and lower horizontal roof plate members and the finished height of the fastening components inevitably become large and bulky, and In order to secure the retaining parts to the rafter members, separate hanger members are required, making the roofing work itself extremely complicated, and the overall structure is relatively complicated. Therefore, it has the disadvantage of high cost. In the case of the latter type, when the ridge side molding part of the lower horizontal roofing board member is engaged from the inside with the eave side molding part of the upper horizontal roofing board member, this engaging part By pressing from above, the ridge side molded part of the lower side horizontal roofing board member is elastically fitted to the hanger member.
A height dimension corresponding to the vertical mating stroke required for this elastic mating is essential, and similarly, the finished height of the securing and fastening components after roofing becomes large. Katsuko also requires a separate suspender member,
Since the elastic fitting due to the springback of the thin steel plate itself is used to secure the engaging part, if the rigidity of the thin steel plate material is high, it will be difficult to fit and secure, resulting in poor workability. There were various undesirable problems such as a significant decrease in workability. This invention is an attempt to improve these conventional problems, and its purpose is to minimize the finished height of the engagement and fastening components after roofing. This type of horizontal roof structure avoids bulkiness after finishing, reduces the overall cost by simplifying the structure itself, and is easy to construct with good workability. The object of the present invention is to provide a horizontal roof structure that can be successively engaged and fixed from the ridge side to the eave side. [Means for Solving the Problems] In order to achieve the above object, the horizontal roof structure according to the present invention has the following features: Engagement with the ridge side molded part and direct and fastening to the rafter members can be simultaneously performed by pulling the lower eave side horizontal roof plate member toward the lower eave side, so that the roof can be constructed. This is what I did. That is, the present invention has a face plate portion left in the center along the longitudinal direction of the long metal plate material, a ridge side molded portion on one side, and an eave side molded portion on the other side, and the ridge side molded portion is formed on the other side. The side molding part is formed with a series of engagement grooves that are open at least on the front side of the face plate part, and a fastening protrusion bent toward the back side of the face plate part. The horizontal roof plate member is bent at least toward the back side of the face plate part and has a series of engagement protrusions corresponding to the engagement grooves; It has mounting pieces that are cut and raised at pitch intervals corresponding to the effective width of the plate member in the ridge direction and extend toward the ridge side, and the lower surface side of each of these mounting pieces corresponds to the fixing protrusion part. Using a rafter member formed with a fastening groove,
The rafter member is installed on the roof structure at a predetermined roof slope, and the ridge side molded part of the lower ridge side horizontal roof plate member is attached to the fixing groove of the attachment piece extended to the ridge side of the rafter member. Inserting and fixing the fastening protrusion formed on the upper ridge side horizontal roof plate member, and inserting and engaging the engagement protrusion formed on the eave side molding of the upper ridge side horizontal roof board member into the engagement groove. It has a horizontal roof structure that is characterized by its horizontal roof structure. Further, in the horizontal roof structure, the present invention provides a predetermined interval in the ridge eave direction between the engagement groove and the engagement protrusion formed in the ridge side molded part of the horizontal roof plate member, and The length of each attachment piece extending toward the ridge side of the roof panel is made shorter than the distance between the engagement groove and the fixing protrusion, and At least a portion of the attaching protruding pieces are overlapped in the vertical position, and there is an upper part between the engaging groove formed in the ridge side molding part of the horizontal roofing board member and the fixing protruding piece. It is characterized by having a bulging crown. [Function J] Therefore, in this invention, the rafter member is installed on the roof structure at a predetermined roof slope, and the lower ridge side is attached to the fixing groove of the attachment piece extended to the ridge side of the rafter member. A fastening protrusion formed on the ridge side molding part of the horizontal roofing sheet member is inserted and fixed, and the fastening protrusion formed on the ridge side molding part of the lower ridge side horizontal roofing sheet member is inserted and fixed to the engagement groove. The fixing protrusion is inserted and fixed, and the engagement protrusion formed on the eave side molding of the upper ridge side horizontal roofing plate member is inserted and engaged with the engagement groove. As a result, it became possible to roof each horizontal roof board member from the ridge side to the eave side as planned, and
In the horizontal roof structure configured in this way, the mutual engagement and fastening of the horizontal roof plate members on the upper ridge side and the lower eave side are performed in parallel to the roofing direction. ,
These engaging and fastening components are arranged in the same direction, allowing the required height to be set sufficiently low, and the roofing work can be done by simply pulling the lower eave-side horizontal roof board members toward the eaves. It can be done very simply and easily by just manipulating it, and it does not require any hangers for fastening.
The number of parts required for roofing can be reduced, and the roofing pitch can be maintained accurately. In addition, in a structure in which the engagement groove and the fastening protrusion are located apart from each other by a predetermined distance in the direction of the eaves, the mutually engaging component of each horizontal roofing board member and the fastening lateral part are separated. In order to be able to arrange it, the required height of these engagement and fastening components can be reduced to the limit, and the engagement groove and the fastening protrusion are positioned so that at least a part of them overlaps vertically. In terms of structure, since the mutually engaging components and fastening components of each horizontal roofing board member can be arranged overlapping each other, these engaging and fastening components can be made highly rigid and compact, and the engagement and fastening components can be made highly rigid and compact. With a structure in which a crown part that bulges upwards is provided between the groove and the fastening protrusion, it is possible to prevent water from seeping into the internal roof base side by ensuring the rigidity of these engagements and the fastening component. .

【Example】

Hereinafter, various embodiments of the horizontal roof structure for buildings according to the present invention will be explained in detail with reference to FIGS. 1 to 7. Figures 1 (a) and (b) are perspective views showing the general configuration of a horizontal roof plate member and a rafter member to which the first embodiment of the present invention is applied, and Figure 2 is a perspective view showing a roofing structure using each of the above members. 3(a) to 3(d) are explanatory diagrams sequentially showing the same roofing construction process, and FIG. 4 and FIG. FIG. 5 is a perspective view showing the general configuration of a horizontal roof board member to which the second embodiment is applied, and an enlarged view of the engagement configuration of a horizontal roof structure constructed using the same horizontal roof board member and rafter members. The cross-sectional view, FIGS. 6 and 7 are perspective views showing the general structure of a horizontally-roofed roof board member to which the third embodiment is applied, and a horizontally-thatched roof constructed using the same horizontally-roofed roofboard member and rafter members. FIG. 3 is an enlarged sectional view showing an engagement structure of the structure. First, the horizontal roof structure according to the first embodiment will be described. Horizontal roof plate member (1) applied to this first embodiment structure
As shown in Fig. 1<8), a long metal thin steel plate is used, the face plate part (2) is left in the center along the longitudinal direction, and the ridge side or The shape part (3) and the eave side molded part (4) are molded on the other side, and one ridge side molded part (3) has one side end part (2) of the face plate part (2). 2a) is folded upward and inward, and a predetermined engagement length (W1
) with an engaging groove (6) formed therein;
(W.+Wz<Ws). However, the top of the head (7) is folded upward and outward by an equivalent length (L/(W*) will be described later), and is formed to bulge out to the upper side, and the outer end of this top of the head (7). The ridge side hanging part (8) is shaped by bending it downward, and the lower end of this ridge side hanging part <<8>> has a predetermined length (L, (L>Wi/L'wl)) equivalent dimension. Just below and inside. In other words, the fixing protrusion (9) is formed by bending downward and inward corresponding to the back side of the face plate (2), and the end of this fixing protrusion (9) is folded and extended downward and outward. a series of abutting portions (lO) formed by
In the case of the embodiment configuration, the distance (W4) between the innermost innermost part of the engagement groove (6) and the outermost starting end of the fastening protrusion (9) is , at least (W.>W.,
However, we have the following relationship (we will be described later), and on the other hand. The other eave side molded part includes an eave side hanging part (11) formed by bending the other end (2b) of the face plate part (2) downward, and an eave side hanging part (11) of the eave side hanging part (11). Engagement protrusions (l2) formed by bending the lower end part downward and inward by a dimension equivalent to a predetermined length (Wa, (It<W@)) are provided in series, and the eaves direction Effective width (Wa)
It is being used. In addition, as for the rafter member (2l) applied in combination with the horizontal roof board member <<1>>, as shown in Fig. 1(b), the horizontal roof board member (1) is Pitch interval (Wb, (
Wa=Wb)), each of which has respective holding piece parts (22) cut up and extending toward the ridge side, and which is located at a corresponding part on the back side of each of these holding piece parts (22), and has the predetermined length. (W
The predetermined length (ws,
A fixing groove (23) with dimensions (w.>via) is formed. As shown in FIG. 2l)
are installed in parallel on the roof frame structure at a predetermined roof slope, and extend to the ridge side of each of these rafter members (2l), and the length dimension formed on the back side of each holding piece (22). (W
The length dimension (w2) at the ridge side molding part (3) of the horizontal roof board member (1) on the lower eave side with respect to the fastening groove (25) in 6)
Insert and fix the fixing protrusion part (9) with a stroke corresponding to the interval (W4), and at the same time, the length dimension (W1) of the lower ridge side molded part (3) is fixed. Matching groove (6
), the engagement protrusion part (12) of the length dimension (WS) at the eave side molding part (4) of the upper horizontal roof sheet member (1)
are similarly inserted and engaged with a stroke corresponding to the interval (W4) and the roof is raised. That is, in the case of a horizontal roof structure using the combination of the horizontal roof board of the first embodiment configured as described above and the rafter for its attachment, the attachment protrusion (23) for the attachment groove (23) is 9
) and the engagement protrusion (l) in the engagement groove (6).
In order for the insertion and engagement in 2) to be carried out in the direction of the eaves within a narrow and limited range that corresponds to the thickness of the material thin steel plate, these engagement and fastening components are This means that the finished height can be set as low as possible. Now, the procedure for hoisting each horizontal roof board member (1) to the rafter member (2l) will be described with reference to Fig. 3. As described above, each rafter member (2l) is attached to the roof assembly structure at a predetermined roof slope, and each holding piece (22), and thus,
Install in advance so that each fastening groove (23) faces the ridge side. In this state, first, attach the eave side molding part (4) of the horizontal roof board member (1) on the upper ridge side to each of these holding pieces (2
2) so as to overlap with each other, but at this time, the end surface of the engagement projection part (l2) at the eave side molding part (4) and the top surface of the engagement protrusion part (l2) at the rafter member (2l) The distance (W,) between each presser piece (22) and the tip surface is (wt
:wl-w+, or W? >W3-Wl). As is clear from the construction procedure described below, this interval (W,) is determined by stopping the molded part (3) on the ridge side of the horizontal roof plate member (1) on the upper ridge side at the corresponding part. It can be set automatically by putting it on (Figure 3 (a)
). Next, in the state shown in FIG. 3(a), the eave side molded part (4) of the horizontal roof board member (1) on the upper ridge side is lifted upwards or slightly upwards as shown by the arrow (31). Then, the ridge side molded part (3) of the horizontal roof board member (1) on the lower eave side is inserted into the upper side of the rafter member (2l) as shown by the arrow (32), but in this state, By appropriately selecting each of the above-mentioned dimensions, the rafter member (2L ) at the presser part (24), and also press the presser part (24) against the starting end of the fastening projection part (9).
24), the opening ends of the engagement grooves (25) on the back side can be opposed to each other (FIG. 3(b)). After that, in the state shown in FIG. 3(b), the eave side molded part (4) of the horizontal roof board member (1) on the upper ridge side that had been lifted upward was lowered, and In addition to the same state, by slightly pressing down downward as shown by the arrow (33), the engaging protrusion of the eave side molded part (4) of the horizontal roof board member (1) on the upper ridge side The tip of the part (l2) can be opposed to the open end of the engagement groove (6) of the ridge side molded part (3) of the horizontal roof board member (1) on the lower eave side (Fig. 3). (C)). Next, while in the state shown in FIG. 3(c), the lower horizontal roof board member (1) is pulled toward the lower eaves as shown by the arrow (34), and the hanger member ( For the fastening groove (25) at the holding part (24) of the lower eave side, the fastening protrusion (9 ) is inserted and fixed, and at the same time,
Eave side molding part (4) of horizontal roof board member (1) on the upper ridge side
For the engagement protrusion (l2) at , the engagement groove (
6) are inserted and engaged (Fig. 3(d)), and by repeating the above operation, each horizontal roofing board member (1) is moved from the ridge side to the eave side as expected, that is, It can be easily roofed from top to bottom. Therefore, when using the structure of the first embodiment, the mutual engagement and fastening of the horizontal roofing board members (1) on the upper ridge side and the lower eave side with respect to each hanger member (2l) are different. Each operation is performed in parallel to the roofing direction, not in the vertical direction orthogonal to the roofing direction as in the past, and each position of mutual engagement and fastening, as well as the ridge side engaging portion (3 )
Because the engagement groove (6) and the fixing protrusion (9) are spaced apart in the direction of the eave to accommodate the holding part (24) of the rafter member (2l), these engagement grooves (6) and the fixing protrusion (9) The mating groove (6) and the fastening protrusion (9) can be held in almost the same plane, and as a result, the required height of the engaging and fastening structure can be reduced as described above. The height can be lowered to the limit, and the presence of the crown part (7) that bulges out to the upper side at the ridge side engaging part (3)
In addition to increasing the rigidity of this ridge-side engaging part (3) itself, the eave-side engaging part (4) after roofing is also made more rigid, and at the same time, rainwater that enters from the retaining part reaches the roof base side. In addition, the overall structure has been simplified and simplified, and since the engagement and fastening are performed at the same time, it is extremely easy to work with and has no problems. It can be done extremely simply and easily without requiring any skill. Next, in the horizontal roofing board member (1) of the second embodiment shown in FIGS. 4 and 5, the horizontal roofing board member (1) of the first embodiment is
In step 1), the fastening protrusion (9) bent downward and inward from the ridge-side hanging part (8) of the ridge-side molded part (3) is inserted into the engagement groove (
6) so that they are superimposed on each other at the top and bottom positions, and the abutting part (lO) is omitted, and the ridge-side drooping part (8) side of the crown part (7) is further By bulging out above, the face plate part 《2
》The horizontal roofing board member (1) of the third embodiment shown in Figs. 6 and 7 has this structure. In addition to the structure of the horizontal roof board member (1) of the second embodiment, the retaining folded part (5) and the ridge side drooping part (8) are formed into a single part, so that they bulge upward in a mountain shape. This is the top of the head (7). Therefore, even in the case of the configurations of the second and third embodiments, by the same operation as the configuration of the first embodiment,
Each horizontal roofing board member (1) can be roofed from the ridge side to the eave side as planned, and in addition to obtaining the same effect and effect as the roof, the lower side of the engagement groove (6) Fastening protrusion (9)
Because the two are inserted and overlapped with each other at the top and bottom positions, the configuration of the engagement and fastening parts is made even more compact and rigid. The top of the head (7) is attached to the eave side molding part (2) on the upper ridge side.
By pressing against the back surface of the other end (2b) of the sloped surface portion (2), it is possible to completely prevent rainwater from entering. [Effects of the Invention] As described in detail above, according to the present invention, the engagement groove is provided in the ridge side molding part and is opened at least on the surface side of the face plate part. and a fixing protrusion bent toward the back side of the face plate part, and a fixing protrusion part bent toward the back side of the face plate part at least on the eave side molding part, and an engaging protrusion part bent toward the back side of the face plate part. A horizontal roofing sheet member formed with an engaging protrusion that corresponds to the groove, and a surface portion that is cut up and raised at pitch intervals corresponding to the effective width in the ridge direction of the horizontal roofing sheet member on the ridge side. , and on the bottom side of each of these mounting pieces,
Using a rafter member formed with a fastening groove corresponding to the fastening protrusion, the rafter member is extended to the ridge side with the rafter member attached to the roof structure at a predetermined roof slope. Inserting and fixing the fixing protrusion formed on the ridge side molded part of the lower ridge side horizontal roofing board member into the fixing groove of the attached attachment piece,
In addition, since the engaging protrusion formed on the eave-side molded part of the upper ridge side horizontal roofing plate member is inserted and engaged with the engagement groove, the horizontal roofing plate member can be inserted and engaged as expected. can be raised from the ridge side to the eave side, and in the horizontal roof structure configured in this way, the mutual engagement and fastening of the horizontal roof board members on the upper ridge side and the lower eave side are Since each operation is performed in parallel to the roofing direction, each of these engaging and fastening components is arranged in the same direction, so that insertion in the direction of the eave can be done as much as possible. Coupled with the simultaneous fastening and fastening within a thin and limited area, the required height can be set sufficiently low, and the roofing work can be done by simply using the eaves of the lower eave side horizontal roof board members. Since it can be carried out by pulling it to the side, the roofing can be done very simply and easily with good work efficiency. In addition, here, the mutually securing parts of each horizontal roofing board member are
Since it is fixed directly to each holding piece cut and raised at a predetermined pitch interval on the rafter member, it is completely different from the conventional case of using a hanger member, and can be used for many hangings. There is no need for sub-members or attachments such as bolts and nuts for attaching them individually, and the number of parts required for roofing a horizontal roof structure can be greatly reduced. When using rafter members in which each holding piece is individually cut and raised at a predetermined pitch interval as a mounting means, each horizontal roof board member is raised to a predetermined pitch interval, in other words,
This allows the roof to be laid automatically and in an orderly manner with accurate dimensions. When creating a structure in which the engagement groove and the fastening protrusion are located apart from each other by a predetermined distance in the direction of the eaves, the engagement component and the fastening component of each horizontal roofing board member are separated. Since the required height of these engagement and fastening components can be set as low as possible, the engagement groove and the fastening protrusion can be arranged at least partially. When creating a structure in which they are positioned so as to overlap vertically, the retaining component and the fastening component of each horizontal roof board member can be placed overlapping, and simultaneous engagement and fastening can be achieved by inserting them in the direction of the eaves. Together with this, it is possible to make these engagement and fastening components more compact and highly rigid, and furthermore, there is a space between the engagement groove and the fastening protrusion that bulges upward. When using a structure with a crown, it not only ensures greater rigidity of the engagement and fastening components, but also has excellent features such as effectively preventing water from seeping into the internal roof base. .

[Brief explanation of the drawing]

Figure 1(a). (b) is a perspective view showing the general structure of a horizontal roof plate member and a rafter member to which the first embodiment of the present invention is applied, and FIG. 3(a) to 3(d) are explanatory views sequentially showing the same roofing construction process, and FIGS. 4 and 5 are sectional views showing the engagement structure in an enlarged manner.
A perspective view showing a general configuration of a horizontally-roofed roof plate member to which an embodiment is applied, a sectional view showing an enlarged engagement configuration of a horizontally-roofed roof structure constructed using the same horizontally-roofed roof plate member and rafter members, 6 and 7 are perspective views showing the general structure of a horizontal roof plate member to which the third embodiment is applied, and an engagement configuration of a horizontal roof structure constructed using the same horizontal roof plate member and rafter members. FIG. 2 is an enlarged cross-sectional view. (1) ...Horizontal roof board members (effective width in the ridge and eave direction (Wa), ...Face plate section, ...Rin side molding section, ...Eave side molding section, ... - Retaining folded part, ... Engagement groove (length (W+)), ... Top of head (length (W.)), ... Ridge side hanging part, ... Stop Attaching protrusion part (length (W2)), ... Contact part, ... Eave side hanging part, ... Engagement protrusion part (length (WS)), ... rafter members,

Claims (4)

[Claims] (1) Leaving a face plate part in the center along the longitudinal direction of the long metal plate material, having a ridge side molding part on one side and an eave side molding part on the other side, said ridge side molding part is formed with a series of engagement grooves that are open at least on the front surface side of the face plate part, and fastening protrusions that are bent toward the back side of the face plate part, and the eave side molded part has at least A horizontal roofing plate member formed of a series of engagement protrusions that are bent toward the back side of a face plate portion and corresponding to the engagement grooves, and a ridge of the horizontal roofing plate member on the front surface portion. It has mounting pieces that are cut and raised at pitch intervals corresponding to the effective width in the direction of the eave and extend toward the ridge side, and a fastening groove that corresponds to the fastening protrusion is provided on the lower surface side of each of these mounting pieces. The rafter member is installed on the roof structure at a predetermined roof slope, and the lower ridge side is attached to the fixing groove of the attachment piece extended to the ridge side of the rafter member. A fastening protrusion formed on the ridge side molding part of the horizontal roofing sheet member is inserted and fixed, and the fastening protrusion formed on the eave side molding part of the upper ridge side horizontal roofing sheet member is inserted and fixed into the engagement groove. A horizontal roof structure characterized by inserting and engaging engaging protrusions. (2) Engagement grooves formed on the ridge side molded part of the horizontal roofing board members, providing a predetermined interval in the ridge eave direction between the engagement protrusions, and each groove cut and raised from the rafter member and extending toward the ridge side. 2. The horizontal roof structure according to claim 1, wherein the length of the attachment piece is shorter than the distance between the engagement groove and the fastening protrusion. (3) The engaging groove formed in the ridge-side molded part of the horizontal roofing plate member and the fastening protrusion part are at least partially overlapped in the vertical position. Horizontal roof structure. (4) A crown part that bulges upward is provided between the engagement groove formed in the ridge side molded part of the horizontal roofing board member and the fastening protrusion part. horizontal thatched roof structure.