JP4745431B2 - Ventilation building - Google Patents

Description

  The present invention relates to a ventilation building, and more particularly to a ventilation building that is attached to a roof ridge for natural ventilation of a back space in a house.

  FIG. 8 is a cross-sectional view showing a schematic structure of a ventilation building disclosed in Patent Document 1. As shown in FIG.

  With reference to the drawing, the ventilation building 61 includes a plate-shaped inclined portion 67 extending obliquely downward from the apex 66 in the width direction, a vertical portion 68 connected to the lower end of the inclined portion 67 and extending vertically downward, It is configured around a ridge plate member 63 including a flange portion 69 extending obliquely downward from a lower end of the vertical portion 68. In the inclined portion 67, three louver-like ventilation ports 64 extending in parallel with the longitudinal direction are formed. A heat insulating material 65 is attached to the lower surface of the building board member 63 on the center side. A draining member 71 having a C-shaped cross section is attached to the lower surface of the inclined portion 67 between the outer end of the heat insulating material 65 and the ventilation port 64, and a vent hole 72 is formed above the draining member 71. Has been. Further, a water stop guard 74 having an L-shaped cross section is attached to the upper surface of the inclined surface of the water draining member 71. A drain hole 75 is formed in the rising portion of the water stop guard 74.

  On the other hand, the roofing material 28 is disposed on a base plate 29 installed on a rafter (not shown), a lower base material 32 installed on the base plate 29 via a waterproof paper (not shown), and the lower base material 32. It is comprised from the flat roof tile 34 made. In addition, it is attached in the state which the drainage drain 33 was inserted between the base plate 29 and the lower dredging material 32.

  At the time of attachment, the ventilation building 61 is arranged so that the lower surface of the draining member 71 is in contact with the waterproof packing 77 attached to the upper surface of the flat roof tile 34 of the roof material 28, and in that state, the ventilation building 61 is used with a fixing nail or the like not shown. 61 is fixed to the roofing material 28.

  The ventilation building 61 installed in this way exhibits both a ventilation function and a waterproof function. In ventilation, as shown by the arrows in the figure, the air discharged from the hut side passes over the water stop guard 74 through the vent hole 72 of the water draining member 71 and passes through the water stop guard 74. Then, it is discharged to the outside through the ventilation port 64 of the inclined portion 67. On the other hand, rainwater entering from the ventilation port 64 is first blocked by the rising portion of the water stop guard 74 and further blocked by the falling portion of the draining member 71. Rainwater that has entered beyond the rising portion of the water stop guard 74 flows down along the inclined surface of the draining member 71 and is discharged to the outside through the flange 78 of the draining member 71 from the upper surface of the flat roof tile 34. In this way, the ventilation building 61 disclosed in Patent Document 1 is configured to exhibit both ventilation performance and waterproof performance.

  However, in such a ventilation building 61, since it is necessary to attach the ventilation building 61 to the roof material 28 in a state where the draining member 71 and the water stop guard 74 are combined with the building plate member 63, it is quick. Installation is difficult. Further, since the intrusion of rainwater is prevented by blocking with the draining member 71 and the water stop guard 74, the reliability as a waterproof function when the amount of rain increases extremely is not sufficient. The ventilation building for solving such problems will be described below.

  FIG. 9 is a cross-sectional view showing a schematic structure of a ventilation building disclosed in Patent Document 2. As shown in FIG.

  With reference to the drawing, the ventilation building 50 is mainly composed of a building plate member 53 and a pair of ventilation members 51 a and 51 b attached to the lower surface of the building plate member 53. The ridge board member 53 is connected to plate-shaped inclined portions 57a and 57b extending obliquely downward from the vertex 56 in the width direction, and outer ends of the inclined portions 57a and 57b, and a pair of vertical portions extending substantially vertically downward. It is comprised from the part 58a, 58b and the flange part 59a, 59b connected to the lower end part of the vertical part 58a, 58b. Each of the inclined portions 57a and 57b is formed with ventilation ports 54a to 54d extending in parallel with the longitudinal direction thereof. The space between the apex 56 and each of the ventilation ports 54b and 54c, which is the lower surface of the inclined portions 57a and 57b, is basically the same as the ridge cover material disclosed in Japanese Patent No. 2610342. Ventilation members 51a and 51b are attached.

At the time of attachment, the fixing nails 36a and 36b are inserted in a state where the waterproof packings 37a and 37b are attached below the attachment holes (not shown). In the ventilation state, as shown by the arrows in the figure, the air rising from between the drains 33a and 33b passes through the ventilation holes of the ventilation members 51a and 51b to the outside, and then ventilates. It is discharged outward through the ports 54a to 54d. Further, rainwater enters under the inclined portions 57a and 57b mainly through the ventilation ports 54a to 54d. The infiltrated rainwater cannot pass inward through the vent holes of the ventilation members 51a and 51b having basically the same configuration as the ridge cover material of the above-mentioned Japanese Patent No. 2610342.
That is, since the ventilation building 50 is formed by integrating the building board member 53 and the ventilation members 51a and 51b that exhibit the ventilation and waterproof functions, the ventilation building 50 can be easily installed on the roofing material 28 and reliably infiltrated with rainwater. Can be prevented.

JP 2001-329668 A JP 2006-9293 A

  The ventilation building disclosed in Patent Document 2 as described above is easy to install and has a high waterproof effect, but there is a possibility that the ventilation capacity of the ventilation building is insufficient. Details will be described below.

  Air from the back of the cabin space is discharged outward through a louvered vent formed mainly in the upper part of the building board member. Therefore, in order to increase the ventilation capacity of the ventilation building, the area of this ventilation port may be increased. However, since the ventilation opening is formed in the upper part of the ridge plate member, if the area of the ventilation opening is enlarged, the amount of rainwater entering the ventilation ridge increases, which is not preferable from the viewpoint of waterproofing. Therefore, the expansion of the ventilation capacity of the ventilation building is limited, and there is a possibility that the ventilation capacity is insufficient.

  The present invention has been made to solve the above-described problems, and an object thereof is to provide a ventilation building having high waterproof performance and easy expansion of ventilation capacity.

  In order to achieve the above object, the invention according to claim 1 is a ventilation building installed on a roof material having an approximately chevron shape and an opening at the center thereof, and is sealed to the top of the roof material. And a first member having a pair of flat surfaces extending obliquely downward in the width direction in a parallel state separated from the roof material by a predetermined distance from the opening portion. , Installed on each flat surface of the first member, and having a cross section in the width direction having a rectangular shape and a bar shape extending in the longitudinal direction along the opening portion, and from one side surface to the other side surface in the width direction A pair of ventilation members having a plurality of ventilation holes penetrating into the ventilation member, and a second member comprising a pair of flat plate portions that are installed so as to cover the ventilation member and extend obliquely downward in the width direction in a substantially chevron shape, The end of the second member in the width direction is on the outer side of the flat surface. A pair of hanging portions extending downward toward the installation, the lower end of each hanging portion is located on a virtual plane including each of the opposing flat surfaces, and the ventilation members are arranged at predetermined intervals in the longitudinal direction. The plurality of Ω-shaped metal bands are fixed to the first member, and the second member is fixed to the upper surface of each of the metal bands.

  If comprised in this way, while the space between the lower end of drooping part and a roof material will become a vent hole, the blowing of the wind and rain added to a roof material does not go directly to a ventilation member. Further, the second member is attached in a state where the ventilation member is protected.

  According to a second aspect of the present invention, in the configuration of the first aspect of the invention, the predetermined distance is determined according to the ventilation capacity of the ventilation member.

  If comprised in this way, the ventilation capability between the lower end of a drooping part and a roof material will interlock | cooperate with the ventilation capability of a ventilation member.

  The invention according to claim 3 is the structure of the invention according to claim 1 or 2, further comprising a heat insulating material attached at least to the lower surface on the apex side of the second member to which the ventilation member is not attached. is there.

  If comprised in this way, dew condensation from the 2nd member is prevented.

  As described above, in the first aspect of the present invention, the space between the lower end of the hanging portion and the roof material serves as a vent hole, so that the ventilation capacity can be easily increased. Further, since the blowing of wind and rain applied to the roofing material does not go directly to the ventilation member, the reliability of the waterproof performance is further improved. Furthermore, since the second member is attached with the ventilation member protected, the second member can be stably attached without damaging the ventilation member.

  In addition to the effect of the invention of claim 1, the invention of claim 2 has the ventilation capacity of the ventilation wing because the ventilation capacity between the lower end of the hanging part and the roofing material is linked to the ventilation capacity of the ventilation member. It can be adjusted easily.

  In addition to the effects of the invention described in claim 1 or 2, the invention described in claim 3 prevents condensation from the second member, thereby preventing water droplets from falling and improving reliability.

1 is a schematic exploded perspective view of a ventilation building according to a first embodiment of the present invention. It is an expanded sectional view of the II-II line shown in FIG. It is the schematic perspective view which showed the external appearance shape of the ventilation member shown in FIG. It is a general | schematic disassembled end view which showed the 1st attachment process to the roof material of the ventilation building shown in FIG. It is a schematic decomposition | disassembly end view which showed the 2nd attachment process to the roof material of the ventilation building shown in FIG. It is the schematic end elevation which showed the attachment state to the roof material of the ventilation building shown in FIG. It is a schematic end view which showed the attachment state to the roof material of the ventilation building by 2nd Embodiment of this invention, Comprising: It corresponds to FIG. 6 of 1st Embodiment. It is sectional drawing which shows schematic structure of the conventional ventilation building. It is sectional drawing which shows schematic structure of the other conventional ventilation building.

  FIG. 1 is a schematic exploded perspective view of a ventilation building according to the first embodiment of the present invention, and FIG. 2 is an enlarged sectional view taken along line II-II shown in FIG.

  With reference to these drawings, the ventilation building 5 is indicated by a first member 10 formed by pressing a steel plate, a pair of ventilation members 8a and 8b installed on the first member 10, and arrows in the figure. Thus, it is mainly comprised from the 2nd member 20 formed by the press work of the steel plate installed so that ventilation member 8a, 8b may be covered.

  The first member 10 has a pair of flat surfaces 11a and 11b extending obliquely downward in the width direction in a parallel state with respect to a roof member (not shown) from the opening portions 16a to 16c formed at the center thereof, and the flat surface 11a. , 11b connected to the outer ends of each of the vertical portions 12a, 12b extending substantially vertically downward, and connected to the lower ends of the vertical portions 12a, 12b, and outward substantially parallel to the flat portions 11a, 11b. It is comprised from the flange parts 13a and 13b extended in this. Further, a plurality of mounting holes 46 are formed in the longitudinal direction on the outer sides of the flat surfaces 11a and 11b for inserting a fixing nail or the like to be described later.

  The ventilation members 8a and 8b are installed on each of the flat surfaces 11a and 11b, have a rectangular cross section in the width direction, and are formed in a bar shape extending in the longitudinal direction along the opening portions 16a to 16c. . The detailed structure of the ventilation members 8a and 8b will be described later.

  Further, draining members 15a and 15b extending in the longitudinal direction along the opening portions 16a to 16c and having an L-shaped cross section in the width direction are arranged on the inner sides of the ventilation members 8a and 8b. Further, waterproof plates 25a to 25d formed so as to cover the inner side from the vicinity of the longitudinal ends of the ventilation members 8a and 8b are fixed to the flat portions 11a and 11b by rivets or the like.

  In addition, a plurality of Ω-shaped metal bands 41a and 41b are installed in the ventilation members 8a and 8b at predetermined intervals in the longitudinal direction so as to cover a part of the ventilation members 8a and 8b. And the part which touches each flat surface 11a, 11b of metal band 41a, 41b is being fixed to flat surface 11a, 11b by the rivets 42a-42d. Further, mounting holes 47a and 47b are formed on the upper surfaces of the metal bands 41a and 41b. The effects of the metal bands 41a and 41b will be described later.

  The second member 20 includes a pair of flat plate portions 21a and 21b that extend substantially obliquely downward in the width direction in parallel with each of the flat surfaces 11a and 11b in an approximately chevron shape, and the outer sides of the flat plate portions 21a and 21b. It consists of a pair of drooping parts 22a and 22b which are connected to one end and extend downward toward the position on the outer side of the flat surfaces 11a and 11b in the installed state. Further, in each of the flat plate portions 21a and 21b, mounting holes 48 are formed at positions corresponding to the mounting holes 47a and 47b on the upper surfaces of the metal bands 41a and 41b in the installed state. Furthermore, the heat insulating material 9 is attached to the portion on the apex side where the ventilation members 8a and 8b are not in contact with the lower surfaces of the flat plate portions 21a and 21b in the installed state.

  Next, the detailed structure of the ventilation members 8a and 8b will be described.

  FIG. 3 is a schematic perspective view showing the external shape of the ventilation member shown in FIG.

  Referring to the drawing, the ventilation member 8 has a rectangular cross section in the width direction, and has a rod shape having substantially the same length as the length of the opening portions 16a to 16c shown in FIG. is doing. Specifically, the ventilation member 8 is connected and integrated with each other by heat fusion in a state where a plurality of synthetic resin sheets each having an uneven cross-sectional shape are stacked. A large number of vent holes 26 penetrating from one side wall to the other side wall are formed.

  In this embodiment, the length A in the width direction of the rectangular cross-sectional shape is 30 mm, and the length B corresponding to the height is 38 mm. The vent hole 26 is set to have a rectangular opening size of approximately 1 mm × 4 mm. Such a ventilation member 8 has basically the same structure as the ridge cover material disclosed in Japanese Patent No. 2610342, like the ventilation member shown in FIG. Thus, under certain conditions, the ventilation member 8 can ventilate through the vent hole 26, and also exhibits a ventilation performance and a waterproof performance that prevent rainwater from entering through the vent hole 26. .

  Next, the attachment of the ventilation building shown in FIG. 1 to the roof material will be described.

  FIG. 4 is a schematic exploded end view showing a first attachment process to the roof material of the ventilation building shown in FIG.

  Referring to the drawing, the roofing material 28 has a substantially chevron shape and an opening at the center. Specifically, the roofing material 28 includes a pair of field boards 29a and 29b installed on rafters (not shown), waterproof paper 30a and 30b installed on the upper surfaces of the field boards 29a and 29b, and waterproof paper. It is comprised from the lower eaves material 32a, 32b installed on each of 30a, 30b, and the flat roof tiles 34a, 34b installed on the lower eaves material 32a, 32b. The draining drains 33a and 33b are attached on the waterproof paper 30a and 30b, and the lower brazing materials 32a and 32b are installed in this state. In addition, sealing materials 39a and 39b are provided on the upper portions of the drainage drains 33a and 33b, respectively.

  When mounting, first, on the flat surface 11a of the first member 10, the draining member 15a and the ventilation member 8a are installed in this order from the inside, and the metal band 41a is covered from above, and the outside of the metal band 41a is placed. The inner side is fixed with the rivet 42a, and the inner side is fixed to the flat surface 11a with the draining member 15a with the rivet 42b. Then, the draining member 15a and the ventilation member 8a are fixed on the flat surface 11a. The ventilation member 8b and the draining member 15b are similarly fixed to the flat surface 11b by the metal band 41b.

  Next, the first member 10 to which the ventilation members 8 a and 8 b are attached is lowered from above so that the opening portion 16 faces the center of the roof material 28 above the roof material 28. Then, the lower surfaces of the flat surfaces 11 a and 11 b are in contact with the sealing materials 39 a and 39 b, and the flange portions 13 a and 13 b are installed on the roof material 28. That is, the first member 10 is installed in a sealed state with respect to the roof material 28.

  Thus, when the 1st member 10 which attached ventilation member 8a, 8b on the roofing material 28 is installed, it will be in the state shown in FIG.

  FIG. 5 is a schematic exploded end view showing a second attaching step to the roof material of the ventilation building shown in FIG.

  Referring to the drawing, the flat surfaces 11a and 11b of the first member 10 installed in a sealed state on the roof material 28 are in a parallel state separated from the roof material 28 by a predetermined distance. Then, the fixing nails 36a and 36b are inserted in the state where the waterproof packings 37a and 37b are attached to the lower side of the attachment hole 46 shown in FIG. 1, and the first member 10 is fixed to the roof material 28 by driving.

  Next, when the second member 20 is lowered from above so as to cover the ventilation members 8a and 8b above the first member 10 and the ventilation members 8a and 8b fixed on the roof material 28, the state shown in FIG. It becomes.

  FIG. 6 is a schematic end view showing a state in which the ventilation building shown in FIG. 1 is attached to the roofing material.

  Referring to the drawing, the second member 20 installed so as to cover the ventilation members 8a and 8b passes through the attachment holes 48 and the attachment holes 47a and 47b formed in the metal bands 41a and 41b shown in FIG. The metal bands 41a and 41b are fixed by screws 43a and 43b. That is, the second member 20 is attached in a state where the ventilation members 8a and 8b are protected by the metal bands 41a and 41b having high rigidity. Therefore, the 2nd member 20 is stably attached, without damaging ventilation member 8a, 8b by the impact from the outside.

  And in the 2nd member 20 installed in this way, as above-mentioned, each of the hanging parts 22a and 22b is extended below toward the outward side of each of the flat surfaces 11a and 11b. Furthermore, the position of each lower end of the drooping portions 22a and 22b is located on a virtual plane (portion indicated by a two-dot chain line in the drawing) including each of the opposing flat surfaces 11a and 11b. Therefore, even if the blowing of wind and rain applied to the roofing material 28 as shown by the alternate long and short dash line in the figure occurs, there is no possibility that the blowing of wind and rain is directed directly to the ventilation members 8a and 8b. Therefore, the reliability of the waterproof performance of the ventilation building 5 is further improved. In the case where wind and rain are blown from between the first member 10 and the roof material 28, the first member 10 is installed in a sealed state on the roof material 28 by the sealing materials 39a and 39b as described above. As a result, intrusion of wind and rain to the inside is prevented.

  In the vented state, the air that has risen from between the drainage drains 33 a and 33 b in the central portion of the roof material 28 passes through the opening portion 16 of the first member 10 as indicated by an arrow. Then, it passes from the inner side to the outer side through the ventilation holes of the ventilation members 8a and 8b. And the air which passed each of the ventilation members 8a and 8b is discharged | emitted outside through the vent holes 18a and 18b which consist of the space between each lower end of the hanging parts 22a and 22b and the roofing material 28. FIG.

  In the vent holes 18a and 18b configured as described above, by increasing the predetermined distance from the roof material 28 on the flat surfaces 11a and 11b of the first member 10, that is, the distance X shown in the drawing, the ventilation area of the vent holes is increased. Can be enlarged. Therefore, expansion of the ventilation capacity is facilitated.

  In the ventilation building 5 according to this embodiment, the distance X is set to 17 mm so as to correspond to the ventilation capacity of the ventilation member having the dimensions shown in FIG. That is, the ventilation area between the lower ends of the hanging parts 22a and 22b and the roof material 28 is set based on the ventilation capacity of the ventilation members 8a and 8b. As described above, since the adjustment of the ventilation area of the ventilation holes 18a and 18b can be adjusted by a predetermined distance from the roof material 28 on the flat surfaces 11a and 11b, it is easily set based on the ventilation capacity of the ventilation members 8a and 8b. Can do. That is, the ventilation capacity of the ventilation building 5 can be easily adjusted.

  In addition, as described above, the heat insulating material 9 is attached to the lower surface of the second member 20 on the top side of the second member 20 where the ventilation members 8a and 8b are not attached. Therefore, condensation from the second member 20 is prevented. Therefore, since the drop of the water drop to the shed space through the opening part 16 of the 1st member 10 and the center part of the roofing material 28 is prevented, the reliability of the ventilation building 5 is improved.

  FIG. 7 is a schematic end view showing the state of attachment of the ventilation building to the roof material according to the second embodiment of the present invention, and corresponds to FIG. 6 of the first embodiment.

  With reference to the drawings, the basic structure of the ventilation building 6 according to this embodiment is the same as that of the ventilation building shown in FIG. In this embodiment, the size of the ventilation members 8a and 8b and the predetermined distance between the flat surfaces 11a and 11b of the first member 10 and the roof material 28 are different.

  In each of the ventilation members 8a and 8b, the length in the width direction of the rectangular cross-sectional shape is 30 mm, and the height is 50 mm. Therefore, compared with the ventilation member in 1st Embodiment, since the passage area of air increases, it becomes the ventilation members 8a and 8b with a large ventilation capability. Then, the flat surfaces 11a and 11b of the first member 10 and the roofing material 28 are arranged so that the ventilation area between the lower ends of the hanging parts 22a and 22b and the roofing material 28 is based on the ventilation capacity of the ventilation members 8a and 8b. Is set to 22 mm. That is, the ventilation building 6 has a larger ventilation capacity than the ventilation building according to the first embodiment.

  Here, the basis for setting the distance Y, which is a predetermined distance, will be described.

The dimensions of each of the ventilation members 8a and 8b in the ventilation building 5 shown in FIG. 6 are a width of 30 mm and a height of 38 mm, and a distance X that is a predetermined distance between each of the flat surfaces 11a and 11b and the roof material 28 is 17 mm. It is. Here, let A be the opening ratio of the ventilation holes for the respective heights of the ventilation members 8a and 8b. A coefficient for converting the air passage area of the ventilation members 8a and 8b into a predetermined distance is α. Then, the distance X which is a predetermined distance is
X = 38 × A × α = 17 (1)
It becomes.

Next, the dimensions of the ventilation members 8a and 8b in the ventilation building 6 according to this embodiment are a width of 30 mm and a height of 50 mm. Since the shape of each of the ventilation holes of the ventilation members 8a and 8b and the ventilation member shown in FIG. 6 is the same, the distance Y which is a predetermined distance is
Y = 50 × A × α (2)
It becomes. Here, when the equation (1) is transformed,
A × α = 17/38 (3)
When substituting equation (3) into equation (2),
Y = 50 × (17/38) = 22 (4)
It becomes. In this way, the distance Y is set.

  In addition, by setting the predetermined distance based on the ventilation capacity of the ventilation members 8a and 8b as described above, the predetermined distance can be set for the ventilation members having various dimensions. Therefore, the ventilation capacity of the ventilation building 6 can be set freely.

  In each of the above embodiments, the structure of the roofing material is specified. However, as long as it is a substantially chevron shape and the central part is opened, the same applies to roofing materials of other structures. it can.

  In each of the above embodiments, the first member is formed in a specific shape including a vertical portion and a flange portion, but if the flat surface is installed in a parallel state with a predetermined distance from the roofing material, The first member may have another shape.

  Furthermore, in each said embodiment, although the dimension and shape of the ventilation member are specified, as long as the same ventilation function and waterproof function are exhibited, another dimension and shape may be sufficient. In this case, it is preferable that the same effect is exhibited under the same conditions as the wind and rain test described in the specification of Japanese Patent No. 2610342.

  Furthermore, in each of the above embodiments, the hanging portion of the second member is formed in a specific shape, but each hanging portion extends downward toward the position on the outer side of the flat surface of the first member. As long as the position of each lower end is located on a virtual plane including each of the flat surfaces of the first member facing each other, it may be formed in another shape.

  Further, in each of the above-described embodiments, the predetermined distance between each flat surface of the first member and the roofing material is determined according to the ventilation capacity of the specific ventilation member. It may be determined based on a simple structure. Needless to say, a predetermined distance may be set according to the ventilation capacity of other ventilation members. On the other hand, the predetermined distance may not be determined according to the ventilation capacity of the ventilation member.

  Further, in each of the embodiments described above, the ventilation member is fixed to the first member by the metal band, but may be fixed to the first member by another member, adhesion, or the like.

  Further, in each of the above embodiments, the second member is fixed to the upper surface of each metal band. However, as long as the second member can maintain the installation state, other methods may be used for the first member or the like. It may be fixed.

  Furthermore, in each said embodiment, although the heat insulating material is attached to the lower surface of the flat plate part of a 2nd member, the heat insulating material may be attached to the whole lower surface of a flat plate part. Or there may be no heat insulating material.

5, 6 ... Ventilation building 8 ... Ventilation member 9 ... Heat insulating material 10 ... First member 11 ... Flat surface 16 ... Opening part 18 ... Vent 20 ... Second member 21 ... Flat plate part 22 ... Hanging part 26 ... Vent 28 ... Roof material 41... Metal band Note that the same reference numerals in the drawings indicate the same or corresponding parts.

Claims (3)

It is a ventilation building that is installed on the roof material that has an almost chevron shape and an open center.
It is installed in a sealed state on the roof material, and has an opening portion facing the center portion, and obliquely toward the width direction in a parallel state separated from the opening portion by a predetermined distance with respect to the roof material. A first member having a pair of flat surfaces extending downward;
It is installed on each of the flat surfaces of the first member, the cross section in the width direction has a rectangular shape and has a bar shape extending in the longitudinal direction along the opening portion, and one side surface in the width direction A pair of ventilation members having a plurality of ventilation holes penetrating from one side to the other side;
A second member comprising a pair of flat plate portions installed so as to cover the ventilation member and extending obliquely downward in the width direction in a substantially chevron shape;
The ends in the width direction of the second member constitute a pair of hanging portions that extend downward toward a position on the outer side of the flat surface, and the positions of the lower ends of the hanging portions are opposed to the flat surface. Located on a virtual plane containing each of
The ventilation member is fixed to the first member by a plurality of Ω-shaped metal bands arranged at predetermined intervals in the longitudinal direction,
The second member is a ventilation building fixed to the upper surface of each of the metal bands.   The ventilation building according to claim 1, wherein the predetermined distance is determined according to a ventilation capacity of the ventilation member.   The ventilation building according to claim 1, further comprising a heat insulating material attached to at least a lower surface on the apex side of the second member to which the ventilation member is not attached.

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