JP2012002006A - Ventilation structure of building - Google Patents

Abstract

PROBLEM TO BE SOLVED: To maintain comfortable and healthy indoor environment in a manner that provides a ventilation layer between an outer wall and an inner wall, makes the inner wall air permeable, and keeps the ventilation layer in negative pressure by forcibly exhausting air therein to gradually discharge VOC and humidity through the inner wall.SOLUTION: The present invention includes: outer walls 2 forming side walls parts 1 of first and second floors of a building and inner walls 3 of the first and second floors which air permeable and arranged on an inner side of outer walls 2; a ventilation layers 4 which are spaces between the outer walls 2 of the first and second floors and the inner walls 3 of the first and second floors; a ventilation opening 7 which is formed to be freely opened and closed and positioned at a rising part 6 of a foundation 5 below the side wall 1 of the first floor; a lower communication part 9 which communicates an underfloor space 8 open to external air through the ventilation opening 7 with the ventilation layer 4 at a lowest part of the side wall 1 of the first floor; an upper communication part 11 which communicates the ventilation layer 4 with an attic space 10 at a highest part of the side wall 1 of the second floor; an intermediary communication part 12 which communicates the ventilation layer 4 of the side wall 1 of the first floor with the ventilation layer 4 of the side wall 1 of the second floor; and an attic fan 13 to exhaust air for depressurizing the attic space 10 and the ventilation layers 4 of the first and second floors.

Description

  In the present invention, a high outdoor temperature is generated while exhausting indoor air including volatile organic compounds (VOC) and moisture without causing a strong air flow in the room by opening a ventilation opening in a hot season. It is a building that can always keep the room comfortable according to the outside temperature, such as shutting off and closing the ventilation opening in the cold time to use the air layer as a heat insulation layer to shut off the cold in winter. It relates to the ventilation structure.

  There are several proposals for the ventilation structure of a building that forms a ventilation layer in the wall structure of the building for ventilation.

  In Patent Document 1, an internal ventilation layer that is provided between a wall structure material and an indoor wall and communicates with an underfloor space that opens to the outside as well as an underfloor space that opens to the outside, and the underfloor space is disposed. Intake means for taking in outdoor air, the indoor wall and ceiling made of a material that allows permeation of air, and a fan provided in the back space, the concentration of volatile substances in the indoor space and the ventilation By utilizing the difference between the concentration of the volatile substance in the layer and the concentration of the volatile substance in the attic space, the air in the indoor space is passed through the indoor wall and the ceiling, respectively, in the ventilation layer or in the hut. It is a building that is configured to be able to pass through the inside of the back and allow the air in the indoor space that has permeated to be discharged outside by the fan.

  Although the technique of this patent document 1 is an excellent technique, it tries to exhaust the air in the indoor space by the difference between the indoor concentration of the volatile substance and the concentration in the ventilation layer or the back of the hut, It seems that it is difficult to obtain a sufficient exhaust effect.

In Patent Document 2, an internal ventilation layer is provided between a wall structure material made of a heat insulating material and an indoor wall having moisture permeability, and the internal ventilation layer is in communication with an underfloor space communicating with the outside and an attic. And a method for controlling the indoor environment of a building having a ventilation insulation structure that automatically and intermittently controls the communication state between the underfloor space and the internal ventilation layer and the communication state between the attic and the outdoors according to the outside air temperature. Because
A dehumidifier communicating with the underfloor space is provided, an exhaust fan that exhausts the inside air from the room to the outside, and an intake port for intake of the outside air into the room,
The temperature and humidity in the room and the internal ventilation layer are always measured, and the water vapor partial pressure is detected from the temperature and humidity in the room and the internal ventilation layer by a controller. It is an indoor environment control method for a building having a ventilation heat insulating structure that maintains the indoor environment by controlling the operation of the dehumidifier so as to always exceed the water vapor partial pressure of the layer.

  The technique of Patent Document 2 is for intermittently controlling the introduction of outside air and the discharge of inside air according to the measurement result of outside air temperature, and automatically introduces extremely low cold air or extremely high hot air into a building. In addition, the water vapor partial pressure of the internal ventilation layer is always kept lower than the water vapor partial pressure in the room, so that the water vapor can move from the room to the internal gas ventilation layer. In particular, there is an advantage that indoor moisture can be discharged from the rainy season to the summer. However, this requires a slightly complicated configuration for measuring outdoor and indoor water vapor partial pressure, controlling the dehumidifier based on the measured partial pressure, measuring the outside air temperature, and controlling the opening and closing of the intake and exhaust ports. .

JP 2008-007999 A Japanese Patent No. 4108682

  In the present invention, a ventilation layer is formed between the outer wall and the inner wall of the side wall portion, the inner wall is configured to be permeable, and the air in the ventilation layer is forcibly evacuated to a negative pressure with respect to the room. An object of the present invention is to provide a ventilation structure for a building that can maintain a comfortable and healthy environment by maintaining and allowing the VOC and moisture to be gradually discharged through the inner wall.

1 of the present invention is an outer wall that constitutes a side wall portion of a building having a level of one or more floors, and a breathable inner wall that is spaced apart from the inner wall,
A ventilation layer configured between an outer wall and an inner wall of the side wall;
A vent for introducing outside air configured to be openable and closable at the rising portion of the foundation below the side wall of the building;
A lower communication part that communicates the underfloor space in which the ventilation port is opened to the outside with the ventilation layer at the lowermost part of the side wall part;
An upper communication part that communicates the ventilation layer with the upper shed of the building at the uppermost part of the side wall part;
Forced exhaust means for exhausting the inside of the shed and the ventilation layer communicating with the shed to depressurize, arranged in the shed at the top of the building;
It is a ventilation structure of a building composed of

  2 of the present invention is the building ventilation structure of 1 of the present invention, wherein the inner wall is composed of a gypsum board and a painted wall material applied thereto.

  3 of the present invention is the ventilation structure of the building according to 1 or 2 of the present invention, wherein the lower communication portion is arranged such that the lower outer surface is joined to the inner surface of the base and the upper end is directly or indirectly in contact with the lower end of the inner wall. Among the hanging portions, a portion exceeding the upper surface of the base is constituted by a plurality of ventilation notches formed by continuously notching at regular intervals along the length direction.

  According to a fourth aspect of the present invention, in the ventilation structure of a building according to the first, second or third aspect of the present invention, a vertical trunk edge for attaching the upper communication portion with the inner wall interposed between the inner wall and the pillar is interposed between the roof and the roof. By extending to the upper part of the ceiling material constituting the lower surface of the roof, it is constructed in a ventilation space generated between the girders constituting the outer periphery of the cabin back, the vertical trunk edge and the end of the ceiling material is there.

  A fifth aspect of the present invention is the ventilation structure for a building according to the first, second, third, or fourth aspect of the present invention, wherein the building is configured as a building having two or more floors, and an intermediate communication portion that communicates the upper and lower floors with a ventilation layer is provided. It is constructed inside the girders placed between the two.

6 of the present invention is the ventilation structure of the building of 5 of the present invention, wherein the intermediate communication portion is formed inside the girder arranged between the upper and lower floors, the ventilation layer on the lower floor side, It consists of a lower connection space that connects the main communication part, and an upper connection space that connects the upper floor side ventilation layer and the main communication part,
Extend the main communication part with the vertical drum edge for mounting the inner wall on the lower floor side along the inner surface of the girder to the lower surface of the edge of the base material on the upper floor, and move up and down via the vertical drum edge Arranging a covering material in a disguise extension surface extending up and down the inner wall of the floor, configured as a space between the covering material and the girder,
The lower connection space is formed between the end of the girder, the vertical trunk edge and the lower floor side ceiling material, the lower side opens to the ventilation layer 4 on the first floor, and the upper side opens to the main communication part 121. Configured in the ventilation space
The upper connection space is configured as a plurality of communication holes opened near the end of the base material of the floor connected to the upper end of the girder so as to communicate between the main communication portion and the ventilation layer on the upper floor side. It is a thing.

  According to the building ventilation structure of 1 of the present invention, in summer, when the ventilating port formed in the rising part of the foundation is in an open state and the forced exhaust means arranged in the back of the hut is in an operating state, The cool air rises through the ventilation layer and is exhausted through the forced exhaust means. As a result, the outside of the side walls and the roof are illuminated by the strong sunlight in the summer, and even if some of the solar heat enters through the insulation, the heat rises through the ventilation layer. The cool air is taken away and exhausted, so that it is less likely to reach the room. As a result, the indoor temperature does not rise easily, and a comfortable temperature state can be maintained, and the cooling efficiency of the air conditioner is improved, which is economical.

  As described above, the inside of the hut and the inside of the ventilation layer are forcibly exhausted and depressurized by the forced exhausting means to be negative pressure, while the inner wall is configured to be breathable as described above. Therefore, indoor air at normal pressure moves into the ventilation layer through the inner wall. Along with the movement of this air, harmful gases such as volatile organic compounds (VOC) that may be present in the indoor air and moisture move to the ventilation layer through the inner wall, and the air rising in the ventilation layer At the same time, it can be released to the outside air. Therefore, as described above, the indoor temperature can be controlled appropriately and economically, and at the same time, the indoor air can be cleaned and problems such as sick house syndrome can be prevented. be able to.

  Further, in winter, the ventilation opening formed in the rising part of the foundation is closed, and the operation of the forced exhaust means in the back of the hut is stopped to prevent external cold air from entering, and in the ventilation layer It is possible to secure the heat insulation effect by the air that is stationary. In addition to the heat insulating effect by the heat insulating material arranged separately, a higher heat insulating effect can be obtained by ensuring the heat insulating effect by the air in the ventilation layer.

  According to the ventilation structure of a building of 2 of the present invention, it is possible to easily create an inner wall that can be ventilated and to have a humidity control function at the same time if an appropriate one is selected for the painted wall material. Is also possible.

  According to the building ventilation structure of the third aspect of the present invention, the lower communication portion can be easily configured with good air permeability, and the communication between the underfloor space and the ventilation layer can be easily performed.

  According to the ventilation structure for a building of 4 of the present invention, the upper communication portion can be easily configured with good air permeability, and communication between the back of the hut and the ventilation layer can be easily performed.

  According to the building ventilation structure of 5 of the present invention, the intermediate communication portion can be easily configured with good air permeability, and the ventilation layers on the upper and lower floors can be easily communicated.

The longitudinal cross-sectional explanatory drawing of the building (2 stories) of the Example which abbreviate | omitted the floor part of the 2nd floor. The longitudinal cross-section explanatory drawing of the building of the Example which abbreviate | omitted the roof part. (a) Cross-sectional explanatory view of the side wall portion of the second floor, (b) Cross-sectional explanatory view of the side wall portion of the first floor, (c) Front explanatory view of the joist hanging that constitutes the lower communication hole.

  Embodiments of the present invention will be described in detail based on examples with reference to the drawings.

  The building ventilation structure of this embodiment is applied to a two-story building. As shown in FIGS. 1 and 2, basically, the outer wall 2 constituting the side wall 1 of the first and second floors of the building is used. And the first and second floor air-permeable inner walls 3 spaced inside each of them, the ventilation layer 4 which is the space between the outer and inner walls 2 and 1 of the first and second floors, Inside, a ventilation port 7 configured to be openable and closable at a rising portion 6 of the foundation 5 below the side wall portion 1 on the first floor, and an underfloor space 8 in which the ventilation port 7 is opened to the outside air are provided on the side wall portion 1 of the first floor. A lower communication portion 9 that communicates with the ventilation layer 4 at the lowermost portion, an upper communication portion 11 that communicates the ventilation layer 4 with the upper shed 10 at the uppermost portion of the sidewall portion 1 on the second floor, and a side wall portion on the first floor An intermediate communication portion 12 for communicating the ventilation layer 4 of 1 and the ventilation layer 4 of the side wall portion 1 on the second floor, The attic ventilation fan (forced draft means) 13 for exhausting order to reduce the internal pressure of the internal and 該小Ya first floor communicating with the back 10 and the second floor of the ventilation layer 4 of Yaura 10, in those configured.

  As shown in FIGS. 1, 2, 3 (a) and 3 (b), the side wall 1 basically includes an outer wall 2 and an inner wall 3 and a ventilation layer 4 which is a space between them. Become.

  In detail, as shown in the figure, the outer wall 2 is arranged on the outer surfaces of the columns 26 and 27, the outer surface of the base 14 on the outer periphery of the building, between the first and second floors, and the outer periphery of the hut 10. A load bearing member 21 that is fixed to the outer surface of the girder member 15, a plurality of vertical body edges 22 that are disposed on the outer surface side of the load bearing member 21 and fixed to the pillar 26 or the intermediate pillar 27 via these members, and It is composed of an exterior material 23 disposed on the front side of the vertical body edge 22, and a heat insulating material 24 is provided on the inner surface side of the load bearing surface material 21.

  The space between the plurality of vertical body edges 22 is an external ventilation layer 25, and the lowermost part opens to the outside under the drainage 29, and the uppermost part opens to the outside under the roof 17. It has become. In this embodiment, the exterior material 23 is made of wood siding.

  In detail, the inner wall 3 includes a face member fixed inside an inner vertical body edge 28 disposed on the pillar 26 and a surface member thereof, as shown in FIGS. 1, 2 and 3A, 3B. It is comprised with the coating wall material apply | coated to. More specifically, gypsum board was used as the face material, and that using volcanic ash and shirasu was used as the coating wall material. The thickness is 15 mm as a whole, and air permeability can be secured.

  The air-permeable layer 4 is a space between the outer wall 2 and the inner wall 3 as shown in FIGS. 1, 2 and 3 (a), 3 (b). This is a space between the heat insulating material 24 provided on the inner surface side of the load bearing surface material 21 and the inner surface of the gypsum board constituting the inner wall 3.

  As described above and shown in FIGS. 1 and 2, the ventilation port 7 is a general one configured to be openable and closable at the rising portion 6 of the lowermost foundation 5 of the side wall portion 1. A general structure comprising a frame fixed to the opening formed in the rising portion 6 of the foundation 5 and a lid member slidably disposed on the frame, and can be opened and closed by manually sliding the lid member. It is. Thus, the ventilation port 7 can freely open or close the underfloor space 8 that is the space inside the rising portion 6 of the outer periphery of the foundation 5 to the outside air.

  As shown in FIGS. 1, 2, 3 (b) and 3 (c), the lower communication portion 9 is configured by creating an opening structure in a joist hook 91 disposed on the base 14 located on the outer periphery of the building. Is. As shown in the figure, the joist hook 91 is a member in which the lower outer surface is fixed to the inner surface of the base 14 installed on the rising portion 6 of the foundation 5 located on the outer periphery of the building, and its upper end is It is in contact with the lower surface of the outer end of the structural floor plywood 16 on the first floor. The lower end of the inner wall 3 and the lower end of the vertical trunk edge 28 are in contact with the upper surface of the outer end of the structural floor plywood 16, and the joist hook 91 is connected to the structural floor plywood 16 via the structural floor plywood 16. It is in contact with the inner wall 3.

  The lower communication portion 9 is a continuous portion of the joist hook 91 that exceeds the upper surface of the base 14 at regular intervals along its length, particularly as shown in FIGS. 3 (b) and 3 (c). A large number of ventilation cutout portions 911 are formed by cutting out and are constituted by these. A large number of ventilation notches 911 constituting the lower communication portion 9 are open to the lowermost part of the ventilation layer 4 located immediately above the upper surface of the base 14, and on the other hand, the outer periphery of the underfloor space 8. It opens to the upper part, and communicates the ventilation layer 4 and the underfloor space 8 well.

  As shown in FIGS. 1 and 2, the upper communication portion 11 has a vertical trunk edge 28 for attaching a face material constituting the inner wall 3 to a column 26 or an intermediate column 27 interposed between them. The ventilation space formed between the girder 15, the vertical trunk edge 28, and the end portion of the ceiling material 101 constituting the outer peripheral portion of the cabin back 10 by extending to above the ceiling material 101 constituting the lower surface of the roof. It is configured.

  In this embodiment, the ceiling material 101 employs a gypsum board. Therefore, the ceiling material 101 can ensure air permeability, like the inner wall 3.

  As shown in FIGS. 2 and 3 (a), the intermediate communication portion 12 includes a main communication portion 121 configured on the inner side of the beam 15 arranged between the first floor and the second floor, and a ventilation layer on the first floor side. 4 and a lower connection space 122 that connects the main communication portion 121, and an upper connection space 123 that connects the second floor side ventilation layer 4 and the main communication portion 121.

  Further, as shown in FIG. 2, the main communication portion 121 described above serves as a base for the floor on the second floor along the inner surface of the girder 15 with the vertical body edge 28 for attaching the face material constituting the inner wall 3 on the first floor side. A covering material 1211 is arranged in a temporary extending surface extending to the lower surface of the end portion of the structural plywood 30 and extending up and down the inner walls 3 of the first floor and the second floor through the vertical body edge 28, and the covering material 1211 and It is configured as a space between the girders 12. As the covering material 1211, a wood board was used.

  As shown in the figure, the lower connection space 122 is configured as a ventilation space formed between the end portions of the girder 15, the vertical trunk edge 28 and the ceiling material 1212 on the first floor, The lower side opens to the ventilation layer 4 on the first floor, and the upper side opens to the main communication part 121.

  Further, as shown in FIGS. 2 and 3A, the upper connection space 123 is connected to the main communication portion 121 and the second floor near the end of the second floor structural plywood 30 connected to the upper end of the beam 15. A plurality of communication holes 301 opened to communicate with the side ventilation layer 4 are configured.

  As shown in FIG. 1, the attic ventilation fan 13 is a forced exhaust means that decompresses the interior of the attic and the ventilation layer 4 on the first and second floors that communicate with the inside, as shown in FIG. 1. It is installed in the shed 10 so as to exhaust to the wife side of the building. This attic ventilation fan 13 is a general ventilation means for exhausting the air in the building itself, but as its exhaust capacity, the inside of the attic 10, the first floor and the second floor ventilation layer 4 is set to a negative pressure. It adopts that which can be decompressed as much as possible. In addition, the inside of the shed 10, the first floor and the second floor of the ventilation layer 4 can be decompressed to a lower pressure than the outside air and the indoor space. Except for the inner wall 3, it is configured to maintain high airtightness.

  In the figure, 18 is a floor material on the first floor, 31 is a floor material on the second floor, 102 is a base material on the ceiling on the second floor, and 1213 is a base material on the ceiling on the first floor.

  Therefore, according to the ventilation structure of the building of this embodiment, for example, in the summer, the ventilation port 7 formed in the rising part 6 of the foundation 5 is opened by sliding the lid part manually and in the hut 10. By using the arranged attic ventilation fan 13 in the exhaust operation state, cool air located in the underfloor space 8 is raised through the ventilation layer 4 on the first floor and the second floor, and this is passed through the attic ventilation fan 13 through the attic ventilation fan 13. It is possible to exhaust from the wife side.

  For this reason, even if the outer surface of the side wall portion 1 and the surface of the roof 17 are illuminated by the strong sunlight in the summer, and the temperature becomes high and a part of the solar heat is transmitted through the heat insulating material 24, the heat of those heats. Is raised by the cool air rising through the ventilation layer 4 on the first and second floors, while the heat that is transferred from the roof 17 to the hut 10 and enters is also similarly increased. The air is exhausted from the wife side of the building through the attic ventilation fan 13 arranged in the attic 10. Therefore, even in the summertime when the sunlight is strong, solar heat is not easily transmitted to the room, and an increase in the room temperature can be suppressed. Therefore, the cooling efficiency of the air conditioner can be improved, which is economical.

  Further, as described above, the shed 10 and the ventilation layer 4 on the first floor and the second floor are forcibly exhausted and depressurized to have a negative pressure, while the inner wall 3 is as described above. Furthermore, since the plasterboard and the painted wall material are configured to be air permeable, indoor air at normal pressure moves into the air permeable layer 4 through the inner wall 3. Through this movement of air, harmful gases such as volatile organic compounds (VOC) that may be present in the indoor air and moisture are moved into the ventilation layer 4 through the inner wall 3 and rise in the ventilation layer 4. Can be released to the outside air with cool air. Therefore, as described above, the indoor temperature can be controlled well and economically, and at the same time, the air can be cleaned and problems such as sick house syndrome can be prevented. Can do.

  The ceiling material 101 on the second floor is also made of gypsum board in this embodiment and has air permeability like the inner wall 3, so that indoor air at normal pressure moves into the shed 10 through the ceiling material 101. Will do. Accordingly, as described above, through the movement of the air, harmful gas such as volatile organic compounds (VOC) and moisture that may exist in the indoor air, moisture, and the like are passed through the ceiling material 101 and the roof 10 It can be moved in and released into the outside air together with the air rising from the ventilation layer 4. Thus, the ceiling material 101 functions in the same manner as the inner wall 3.

  Further, in winter, the ventilation opening 7 formed in the rising portion 6 of the foundation 5 is manually closed, and the operation of the cabin ventilation fan 13 in the cabin 10 is also stopped, so that the outside cold space under the outside air can be obtained. 8. The entrance to the ventilation layer 4 and the shed 10 can be prevented, and the heat insulation effect by the air stationary in the ventilation layer 4, the underfloor space 8 and the shed 10 can be secured. In addition to the heat insulating effect by the heat insulating material 24 arranged separately, a higher heat insulating effect can be obtained by ensuring the heat insulating effect by the air in the ventilation layer 4 and the underfloor space 8.

  The building ventilation structure of the present invention can be effectively used in the construction field.

DESCRIPTION OF SYMBOLS 1 Side wall part 2 Outer wall 21 Load bearing surface material 22 Vertical trunk edge 23 Exterior material 24 Heat insulating material 25 External ventilation layer 3 Inner wall 4 Ventilation layer 5 Foundation 6 Rising part 7 Ventilation port 8 Underfloor space 9 Lower communication part 91 Radial hook 911 Ventilation notch Part 10 Hut Back 101 Ceiling material on the second floor 102 Ceiling material on the second floor 11 Upper communication part 12 Intermediate communication part 121 Main communication part 1211 Cover material 1212 Ceiling material on the first floor 1213 Ceiling material on the first floor 122 Lower connection space 123 Upper connection space 13 Ventilation fan (forced exhaust means)
14 Base 15 Girder 16 First Floor Structural Floor Plywood 17 Roof 18 First Floor Floor Material 26 Pillar 27 Middle Column 28 Inner Vertical Trunk 29 Draining 30 Second Floor Structural Floor Plywood 301 Communication Hole 31 Second Floor Floor Material

Claims (6)

An outer wall constituting the side wall of a building of the first floor or higher, and a breathable inner wall arranged at an interval inside the outer wall;
A ventilation layer configured between an outer wall and an inner wall of the side wall;
A vent for introducing outside air configured to be openable and closable at the rising portion of the foundation below the side wall of the building;
A lower communication part that communicates the underfloor space in which the ventilation port is opened to the outside with the ventilation layer at the lowermost part of the side wall part;
An upper communication part that communicates the ventilation layer with the upper shed of the building at the uppermost part of the side wall part;
Forced exhaust means for exhausting the inside of the shed and the ventilation layer communicating with the shed to depressurize, arranged in the shed at the top of the building;
Ventilation structure of a building composed of   The ventilation structure of a building according to claim 1, wherein the inner wall is composed of gypsum board and a painted wall material applied thereto.   The lower communication part is connected to the inner surface of the base with the lower outer surface, and the part extending beyond the upper surface of the base in the part of the joist hanging part that is directly or indirectly in contact with the lower end of the inner wall The ventilation structure of a building according to claim 1 or 2, comprising a plurality of ventilation cutout portions that are created by cutting out continuously at regular intervals along the line.   By extending a vertical trunk edge for attaching the upper communication part to the pillar or the interposition between the inner wall and the pillar, it extends to above the ceiling material that constitutes the lower surface of the roof, so that the outer periphery of the roof The ventilation structure of a building according to claim 1, 2 or 3, wherein the ventilation member is formed in a ventilation space formed between an end portion of the girder member, the vertical trunk edge and the ceiling member.   The building according to claim 1, 2, 3 or 4, wherein the building is constructed as a building having two or more floors, and an intermediate communication portion communicating the upper and lower floor ventilation layers is formed inside a girder arranged between the upper and lower floors. Construction. The intermediate communication portion 12 is configured inside a girder arranged between the upper and lower floors, a lower connection space connecting the lower floor side ventilation layer and the main communication portion, and an upper floor side Consists of a ventilation layer and an upper connection space that connects the main communication part,
Extend the main communication part with the vertical drum edge for mounting the inner wall on the lower floor side along the inner surface of the girder to the lower surface of the edge of the base material on the upper floor, and move up and down via the vertical drum edge Arranging a covering material in a disguise extension surface extending up and down the inner wall of the floor, configured as a space between the covering material and the girder,
The lower connection space is formed between the end of the girder, the vertical trunk edge and the lower floor side ceiling material, the lower side opens to the ventilation layer 4 on the first floor, and the upper side opens to the main communication part 121. Configured in the ventilation space
The upper connection space is configured as a plurality of communication holes opened near the end of the base material of the floor connected to the upper end of the girder so as to communicate between the main communication portion and the ventilation layer on the upper floor side. The building ventilation structure according to claim 5.

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