building

Abstract

A building includes a roofing board, an exterior wall panel, a roof air passage disposed along the roofing board, an upper wall air passage on an inside of the exterior wall panel, and a restricting part. The restricting part is provided so as to connect from an upper surface of the roofing board to a waterproofing sheet, and restricts entering of water to an exterior wall base and the upper surface of the roofing board. A panel lower end portion of the exterior wall panel forms an air intake port. A connection passage that connects the roof air passage and the upper wall air passage is formed on an inside of the restricting part.

Description

TECHNICAL FIELD

[0001] The present invention relates to a building having a lean-to structure.BACKGROUND ART

[0002] Conventionally, a building having a lean-to structure is known. The lean-to is disposed at a position lower than a roof of a purlin, and is disposed so as to protrude from the purlin.

[0003] Patent Literature 1 discloses a building having the lean-to structure as described above. In the building, an air layer continuous from the lean-to along an exterior wall of a second floor of the purlin is formed. The air layer on the lean-to is disposed to be inclined below a waterproofing sheet and a roofing board. On the other hand, the air layer on the exterior wall is disposed further on an inside of the moisture-permeable waterproofing sheet on an inside of the exterior wall. The two air layers formed on the inside of each of the roof and the exterior wall in this manner communicate with each other at an upper end portion of the lean-to. Such a structure allows air discharged from the first floor and an attic of the lean-to to be discharged to an outside from an upper end portion of the exterior wall of the second floor.CITATION LISTPatent Literature

[0004] Patent Literature 1: JP 2005-83142 A

[0005] In the technique described in Patent Literature 1, in winter, air containing a large amount of moisture that has flowed into the air layer on the lean-to from the first floor and the attic flows into the air layer on the exterior wall of the second floor. Since air containing moisture also flows into the air layer on the exterior wall of the second floor from an indoor side of the second floor, there is a problem that moisture in the air layer increases and the flow of air stagnates, and dew condensation easily occurs in the air layer and a heat insulating material adjacent to the air layer.SUMMARY OF INVENTION

[0006] An object of the present invention is to prevent dew condensation from occurring in a ventilation passage and a periphery of the ventilation passage while maintaining waterproof performance in a periphery of a connection portion between a lean-to and an exterior wall in a building having a lean-to structure.

[0007] The present invention provides a building. The building includes a roof having a roof base and a roof ventilation passage provided below the roof base along the roof base, an exterior wall erected on an end portion of the roof and including an exterior wall base, an exterior wall panel disposed on an outside of the exterior wall base, a waterproof member that is disposed on an outer surface of the exterior wall base so as to extend in an up-down direction and restricts entry of water into the exterior wall base, and an exterior wall ventilation passage provided along the exterior wall panel toward an upper end portion of the exterior wall panel between the exterior wall panel and the waterproof member, and a restricting part that is provided so as to be connected to the waterproof member from an upper surface of the roof base and restricts entry of water into the upper surface of the roof base and the exterior wall base, in which the exterior wall panel includes a panel lower end portion that is disposed above the restricting part at an interval and forms an air intake port communicating with the exterior wall ventilation passage between the panel lower end portion and the restricting part, and a connection passage that connects the roof ventilation passage and the exterior wall ventilation passage is formed on an inside of the restricting part.BRIEF DESCRIPTION OF DRAWINGS

[0008] FIG. 1 is a schematic side sectional view of a building according to an embodiment of the present invention.

[0009] FIG. 2 is a sectional view of a periphery of an upper end portion of a lean-to of a building according to an embodiment of the present invention.

[0010] FIG. 3 is an enlarged sectional view in which a part of FIG. 2 is enlarged.

[0011] FIG. 4A is a horizontal sectional view of a periphery of a connection passage of a building according to an embodiment of the present invention.

[0012] FIG. 4B is a front view of a periphery of a connection passage of a building according to an embodiment of the present invention.

[0013] FIG. 4C is a side sectional view of a vicinity of a connection passage of a building according to an embodiment of the present invention.

[0014] FIG. 5A is a front view of a flashing of a building according to an embodiment of the present invention.

[0015] FIG. 5B is a side view of a flashing of a building according to an embodiment of the present invention.

[0016] FIG. 6A is a horizontal sectional view of a periphery of a connection passage of a building according to a first modified embodiment of the present invention.

[0017] FIG. 6B is a front view of the periphery of the connection passage of the building according to the first modified embodiment of the present invention.

[0018] FIG. 6C is a side sectional view of the periphery of the connection passage of the building according to the first modified embodiment of the present invention.

[0019] FIG. 7 is a sectional view of a periphery of an upper end portion of a lean-to of a building according to a second modified embodiment of the present invention.DESCRIPTION OF EMBODIMENTS

[0020] Hereinafter, a building 1 according to each embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic side sectional view of the building 1 according to an embodiment of the present invention. In each of the subsequent drawings including FIG. 1, a front-rear direction, a left-right direction, and an up-down direction are shown as necessary for ease of description, but these directions do not limit the present invention.

[0021] As shown in FIG. 1, the building 1 includes a lower wall portion 2, a roof 3, and an upper wall portion 4. The lower wall portion 2 is a wall extending in the up-down direction on a front side of the building 1. The roof 3 extends upward from an upper end portion of the lower wall portion 2 and covers the inside of the building 1. The upper wall portion 4 is erected so as to extend upward from an upper end portion (tip portion) of the roof 3. The roof 3 and the upper wall portion 4 are connected to each other at a connection portion 5. As an example, the inside of the lower wall portion 2 constitutes a first floor of the building 1. The inside of the upper wall portion 4 constitutes a second floor of the building 1. In other words, in the present embodiment, the roof 3 is disposed below a roof (not shown) of a purlin and corresponds to a lean-to protruding from the purlin.

[0022] As shown in FIG. 1, a lower wall air passage 2A is formed on an inside of the lower wall portion 2, and an upper wall air passage 4A (exterior wall ventilation passage) is formed on an inside of the upper wall portion 4. A roof air passage 3A (roof ventilation passage) is formed on an inside of the roof 3. In the present embodiment, air in the lower wall air passage 2A flows into the roof air passage 3A and flows toward the connection portion 5. In the connection portion 5, the air flows into the upper wall air passage 4A. Air flows into the upper wall air passage 4A from the second floor of the building 1. The air in the upper wall air passage 4A is discharged to the outside at an upper end portion of the upper wall portion 4. Hereinafter, an inflow structure of air from the roof air passage 3A to the upper wall air passage 4A will be described in detail.

[0023] FIG. 2 is a sectional view of a periphery of the connection portion 5 of the building 1, and FIG. 3 is an enlarged sectional view in which a part of FIG. 2 is enlarged. The building 1 includes a roofing board 30, a heat insulating layer 31, a plurality of tiles 32, and a roofing 33.

[0024] The roofing board 30 corresponds to a roof base in the present embodiment. The roofing board 30 is disposed so as to be inclined upward toward the upper wall portion 4 (exterior wall). The roofing board 30 includes, for example, a wooden plate member. The roof air passage 3A is provided below the roofing board 30 along the roofing board 30.

[0025] The heat insulating layer 31 is disposed below the roofing board 30 at an interval. Although not shown in FIG. 2, the roofing board 30 is supported by a plurality of rafter members arranged at intervals in a direction orthogonal to the sheet surface of FIG. 2. Each of the rafter members is disposed so as to extend upward along the roofing board 30. The heat insulating layer 31 is disposed between adjacent rafter members or below the rafter members. The roof air passage 3A is formed between the roofing board 30 and the heat insulating layer 31.

[0026] The plurality of tiles 32 are disposed on the roofing board 30. Although two tiles 32 are shown in FIG. 2, the plurality of tiles 32 is further arranged in the front-rear direction and the left-right direction along the roof 3 in FIG. 1. The tiles 32 are engaged with a crosspiece 32H (FIG. 3) disposed on the roofing board 30.

[0027] The roofing 33 prevents water from entering an inside of the roofing board 30 and the upper wall portion 4. In the present embodiment, a roofing splice plate 33S (FIG. 3) including a metal plate is disposed on the roofing board 30 in advance, and the roofing 33 is disposed along the roofing splice plate 33S. The roofing 33 and the roofing splice plate 33S are disposed so as to be bent from an upper end portion of the roofing board 30 to a furring strip 54 described later.

[0028] An airtight sheet (not shown) is disposed below the heat insulating layer 31 or the like, and suppresses movement of moisture between the indoor and the outdoor through the roof 3.

[0029] Furthermore, the building 1 includes a pillar 40, a heat insulating material 41, a plasterboard 43, an exterior wall panel 46, a base material 47, a waterproofing sheet 48 (waterproof member), a heat insulating material 49, a heat insulating material 50, a base plate 51 (FIG. 3), a base wood 52, a crossrail 53, a furring strip 54 (support), a base furring strip 55, a flashing 56, a flashing 57, and a watertight material 58.

[0030] The pillar 40 constitutes a part of the upper wall portion 4. The pillar 40 is disposed so as to extend in the up-down direction. Although not shown in FIGS. 2 and 3, a plurality of pillars 40 is disposed at intervals in the left-right direction (direction orthogonal to the sheet of FIG. 2).

[0031] The heat insulating material 41 is disposed in a space between the plurality of pillars 40 adjacent in the left-right direction. The heat insulating material 41 may be a soft heat insulating material or a hard heat insulating material, and both the hard heat insulating material and the soft heat insulating material may be used. The heat insulating material 41 may be a foamable heat insulating material or a fiber heat insulating material. The same applies to a heat insulating material described later.

[0032] An airtight sheet (not shown) is disposed on an inner surface of each pillar 40 so as to extend in the up-down direction.

[0033] The plasterboard 43 (FIG. 2) is disposed on an inside of the pillar 40. The plasterboard 43 defines an indoor space inside the upper wall portion 4.

[0034] The exterior wall panel 46 constitutes an outer surface of the upper wall portion 4. As an example, the exterior wall panel 46 is a ceramic-based siding. The exterior wall panel 46 has a panel lower end portion 46S corresponding to a lower end portion of the exterior wall panel 46 (FIG. 3).

[0035] The base material 47 includes wood disposed on an inside of the exterior wall panel 46. The base material 47 is a member for supporting the exterior wall panel 46, and a thickness of the base material 47 forms a space for the upper wall air passage 4A.

[0036] The waterproofing sheet 48 is disposed on the inside of the exterior wall panel 46 and on outer surfaces of the heat insulating materials 49 and 50 so as to extend in the up-down direction. The waterproofing sheet 48 restricts and prevents water from entering the inside of the upper wall portion 4, particularly, the heat insulating materials 49 and 50, the base plate 51, and the like. The heat insulating materials 49 and 50 are disposed on the inside of the exterior wall panel 46, and have a function as so-called exterior heat insulation. The heat insulating material 50 extends to an upper end side of the upper wall portion 4 along the base plate 51.

[0037] The base plate 51 (FIG. 3) is disposed so as to extend in the up-down direction along an outer surface of the pillar 40 and an outer surface of the crossrail 53. The base plate 51 functions as a base of the heat insulating materials 49 and 50.

[0038] The base wood 52 (support) is disposed continuously in the left-right direction. The base wood 52 has a function of supporting the exterior wall panel 46 with the base material 47 interposed therebetween.

[0039] The crossrail 53 is disposed between the pillars 40 adjacent to each other in the left-right direction, and extends along the left-right direction. The crossrail 53 has a function of supporting the base plate 51 and the base wood 52.

[0040] The furring strip 54 is disposed below the base wood 52 so as to extend in the up-down direction. The furring strip 54 is fixed to the pillar 40 by a nail (not shown) and supports the base furring strip 55.

[0041] The base furring strip 55 (FIG. 3) is disposed below the exterior wall panel 46. Although not shown in FIGS. 2 and 3, the base furring strip 55 is fixed to the furring strip 54 by a nail (not shown). The base furring strip 55 has a function of supporting the flashings 56 and 57.

[0042] The flashing 56 prevents water from entering the inside of the roof 3 and the upper wall portion 4 through an upper surface of the uppermost tile 32 of the plurality of tiles 32. An upper end portion of the flashing 56 is connected to a lower end portion of the waterproofing sheet 48, and a waterproof line is formed by the upper end portion and the lower end portion. The waterproof line also includes the flashing 57 and also the roofing 33 described above (FIGS. 2 and 3). Note that the structure of the flashing 56 will be described later in detail. The flashing 57 is disposed on an inside of the flashing 56 and prevents water from entering the inside of the roof 3 and the upper wall portion 4 through the upper surface of the uppermost tile 32. A watertight material 58 is fixed to a tip of the flashing 57, and the watertight material 58 is disposed so as to be in close contact with the upper surface of the tile 32. As shown in FIG. 3, the flashings 56 and 57 are fixed to the base furring strip 55 by screws or fixing means (not shown).

[0043] In the present embodiment, the upper wall air passage 4A is provided along the exterior wall panel 46 toward an upper end portion of the exterior wall panel 46 between the exterior wall panel 46 and the waterproofing sheet 48. The heat insulating materials 49 and 50, the base plate 51, and the furring strip 54 constitute an exterior wall base G in the present embodiment. The exterior wall panel 46 is disposed on an outside of the exterior wall base G at an interval. Furthermore, the roofing 33, the base furring strip 55, and the flashings 56 and 57 function as restricting parts R. The restricting part R is provided so as to connect from an upper surface of the roofing board 30 to the waterproofing sheet 48, and restricts the entering of water to the exterior wall base G and the upper surface of the roofing board 30. As shown in FIG. 3, the panel lower end portion 46S of the exterior wall panel 46 is disposed above the flashing 56 at an interval, and forms an air intake port P communicating with the upper wall air passage 4A between the panel lower end portion and the flashing 56. In such a configuration, a connection passage Q that connects the roof air passage 3A and the upper wall air passage 4A is formed on an inside of the restricting part R.

[0044] The connection passage Q includes a main passage Q1 and a sub passage Q2 (FIG. 3). The main passage Q1 has a lower end portion communicating with the roof air passage 3A, and extends in the up-down direction on the inside of the restricting part R. On the other hand, the sub passage Q2 allows the main passage Q1 and the upper wall air passage 4A to communicate with each other in the front-rear direction (inner-outer direction) above the panel lower end portion 46S of the exterior wall panel 46.

[0045] FIG. 4A is a horizontal sectional view of a vicinity of the connection passage Q of the building 1 according to the present embodiment, FIG. 4B is a front view thereof, and FIG. 4C is a side sectional view thereof. In the present embodiment, the heat insulating material 49, the base wood 52, and the furring strip 54 constitute a main passage Q1 of the connection passage Q. Specifically, as described above, the plurality of furring strips 54 is arranged at intervals in the left-right direction. Note that a heat insulating material 54X is disposed between adjacent furring strips 54. An air slit 54H (support groove) is formed in each furring strip 54 extending in the up-down direction so as to face the restricting part R (FIG. 3). As shown in FIG. 4A, the air slit 54H is a groove formed in the furring strip 54 so as to extend in the up-down direction.

[0046] Similarly, a base wood slit 52H (support groove) is formed in the base wood 52 disposed above the furring strip 54. As shown in FIGS. 4B and 4C, the base wood slit 52H is a groove formed in the base wood 52 so as to extend in the up-down direction. Furthermore, a heat insulating material slit 49H (heat insulating material groove) is formed in the heat insulating material 49 disposed above the base wood 52. As shown in FIGS. 4B and 4C, the heat insulating material slit 49H is a groove formed in the heat insulating material 49 so as to extend in the up-down direction.

[0047] A lower end portion of the air slit 54H communicates with the roof air passage 3A. An upper end portion of the air slit 54H communicates with a lower end portion of the base wood slit 52H. An upper end portion of the base wood slit 52H communicates with a lower end portion of the heat insulating material slit 49H.

[0048] FIG. 5A is a front view of the flashing 56 (covering member) of the building according to the present embodiment, and FIG. 5B is a side view of the flashing 56. The flashing 56 is disposed to cover the exterior wall base G on the inside of the exterior wall panel 46. The flashing 56 is formed by bending a plate-shaped metal member, and includes a first vertical portion 56A (vertical portion), a first inclined portion 56B (inclined portion), a second inclined portion 56C (inclined portion), and a second vertical portion 56D. The first vertical portion 56A constitutes an upper portion of the flashing 56. A plurality of air slits 56H (through holes) is formed in the first vertical portion 56A at intervals in the left-right direction. Each of the air slits 56H extends in an elongated hole shape in the up-down direction. The air slit 56H has a shape not limited to the elongated hole shape, and may have other shapes such as a cross shape. The first inclined portion 56B is disposed so as to extend downward from a lower end portion of the first vertical portion 56A toward the outside. The second inclined portion 56C is connected to a lower end portion of the first inclined portion 56B via a slight step, and is disposed so as to extend downward toward the outside similarly to the first inclined portion 56B. The second vertical portion 56D extends downward from a lower end portion of the second inclined portion 56C. When the flashing 56 is supported by the base furring strip 55, the first vertical portion 56A is disposed to face the heat insulating material 49 and an upper portion of the base wood 52. On the other hand, the roofing splice plate 33S described above is disposed to face a lower portion of the crossrail 53 and the furring strip 54. As a result, the heat insulating material slit 49H, the base wood slit 52H, and the air slit 54H described above are closed from the outside, and an air passage is formed.

[0049] The flashing 56 further includes a first turnup portion 561 (protrusion), a second turnup portion 562 (protrusion), and a turndown portion 563. The first turnup portion 561 protrudes downward from an upper portion of the plurality of air slits 56H toward the outside. Similarly, the second turnup portion 562 protrudes downward from a lower portion of the plurality of air slits 56H toward the outside. The first turnup portion 561 and the second turnup portion 562 have a function of suppressing entry of water into the plurality of air slits 56H. The turndown portion 563 protrudes toward the inside from a lower end portion of the second vertical portion 56D. Note that a protruding direction of each of the turnup and turndown portions may be limited to a form shown in FIG. 5.

[0050] When the first vertical portion 56A of the flashing 56 is disposed to extend in the up-down direction along the outer surfaces of the heat insulating material 49 and the heat insulating material 50 on the inside of the exterior wall panel 46, the air slit 56H formed in the first vertical portion 56A is disposed to face the heat insulating material slit 49H in FIG. 4B. As a result, the air slit 56H forms the sub passage Q2, and the main passage Q1 and the upper wall air passage 4A communicate with each other in the inner-outer direction. On the other hand, as shown in FIG. 3, the first inclined portion 56B of the flashing 56 forms the intake port P with the panel lower end portion 46S of the exterior wall panel 46. Furthermore, a portion of the flashing 56 extending upward from the first turnup portion 561 receives the waterproofing sheet 48.

[0051] As described above, in the present embodiment, the waterproofing sheet 48 and the restricting part R can maintain high waterproof performance around the connection portion 5 from the roof 3 to the upper wall portion 4, and allow the air of the roof air passage 3A to flow into the upper wall air passage 4A through the connection passage Q. Therefore, the air on the roof 3 and the air on an upper floor can be discharged to the outside from the same ventilation passage, and generation of dew condensation in the roof air passage 3A and the upper wall air passage 4A can be suppressed. At this time, since outside air flows into the upper wall air passage 4A from the intake port P between the panel lower end portion 46S of the exterior wall panel 46 and the restricting part R, the air flowing in from the roof air passage 3A and the air flowing in from the inside of the exterior wall base G can be quickly guided upward by the upward airflow. Furthermore, even when air containing moisture flows into the upper wall air passage 4A from the roof air passage 3A through the connection passage Q in winter or the like, a relative humidity can be lowered by the outside air taken in from the intake port P. Therefore, it is possible to stably suppress generation of dew condensation around the upper wall air passage 4A due to the moisture of the air flowing in from the roof air passage 3A and the moisture of the air flowing in from the inside of the upper wall portion 4.

[0052] In the present embodiment, since the connection passage Q has the main passage Q1 and the sub passage Q2, the main passage Q1 can guide the air flowing in from the roof air passage 3A to a position above the panel lower end portion 46S, and then the sub passage Q2 allows the air to flow into the upper wall air passage 4A.

[0053] Furthermore, in the present embodiment, the main passage Q1 includes the heat insulating material slit 49H formed along the up-down direction in the heat insulating material 49 so as to face the restricting part R. Such a configuration can guide the air flowing in from the roof air passage 3A upward by using the heat insulating material slit 49H formed in the heat insulating material 49.

[0054] The main passage Q1 includes the base wood 52 so as to face the restricting part R, the base wood slit 52H formed along the up-down direction in the furring strip 54, and the air slit 54H. Such a configuration can guide the air flowing in from the roof air passage 3A upward by using each slit formed in the base wood 52 and the furring strip 54.

[0055] Furthermore, the present embodiment allows the air in the main passage Q1 to flow into the upper wall air passage 4A along the inner-outer direction by using the air slit 56H formed in the flashing 56.

[0056] In particular, the flashing 56, which has the first vertical portion 56A and the first inclined portion 56B, can have a waterproof function for the exterior wall base G, a function of allowing air to flow from the main passage Q1 into the upper wall air passage 4A, and a function of taking the outside air into the upper wall air passage 4A.

[0057] In the present embodiment, even if water enters a periphery of the flashing 56 from the exterior wall panel 46, the flashing 56, which has the first turnup portion 561 and the second turnup portion 562, can prevent the water from entering the air slit 56H. Note that the flashing 56 may have one of the first turnup portion 561 or the second turnup portion 562.

[0058] Although the building 1 according to an embodiment of the present invention has been described above, the present invention is not limited thereto, and for example, the following modified embodiments can be adopted.

[0059] (1) FIG. 6A is a horizontal sectional view of a vicinity of a connection passage of a building according to a first modified embodiment of the present invention, FIG. 6B is a front view thereof, and FIG. 6C is a side sectional view thereof. In the above embodiment, as shown in FIG. 4, the slits are formed in the furring strip 54, the base wood 52, and the heat insulating material 49 from the bottom, but the present invention is not limited to this form. As shown in FIG. 6, the main passage Q1 may be formed between the furring strips 54 adjacent to each other in the left-right direction. In this case, the air slit 54H is formed in the heat insulating material 54X, and sequentially communicates with the base wood slit 52H and the heat insulating material slit 49H similar to those in the embodiment described previously. In such a case, the air flowing in from the roof air passage 3A can be also guided upward.

[0060] (2) FIG. 7 is a sectional view of a periphery of an upper end portion of a lean-to of a building according to a second modified embodiment of the present invention. In the above embodiment, the description has been given in a form in which the building 1 has a so-called exterior heat insulating structure, but the building 1 is not required to have the structure. In FIG. 7, a plywood plate 73 is disposed on an outer surface of the heat insulating material 41 similar to the heat insulating material in FIG. 3. Then, the waterproofing sheet 48 is disposed on an outer surface of the plywood plate 73. The main passage Q1 of the connection passage Q is formed by an air spacer 71 and an air spacer 72 provided on the outer surface side of the heat insulating material 41 so as to sandwich the crossrail 53 from above and below in addition to the crossrail 53. The air slit 53H (not shown) is formed in the crossrail 53 in the up-down direction. On the other hand, the air spacer 71 and the air spacer 72 are constituted by an elastic member having a cell structure through which air passes. Also in the present modified embodiment, the air slit 56H of the flashing 56 is disposed so as to face the air spacer 71. Note that, in a case where the plywood plate 73 and the air spacer 71 are disposed so as to overlap each other, it is sufficient to form an air slit also in the plywood plate 73. In such a configuration, the air flowing into the main passage Q1 of the connection passage Q from the roof air passage 3A can flow into the upper wall air passage 4A through the main passage Q1 and the sub passage Q2.

[0061] The above specific embodiments of the present invention mainly include the invention having the following configurations. A building according to a first aspect of the present invention includes a roof having a roof base and a roof ventilation passage provided below the roof base along the roof base, an exterior wall erected on an end portion of the roof and including an exterior wall base, an exterior wall panel disposed on an outside of the exterior wall base, a waterproof member that is disposed on an outer surface of the exterior wall base so as to extend in an up-down direction and restricts entry of water into the exterior wall base, and an exterior wall ventilation passage provided along the exterior wall panel toward an upper end portion of the exterior wall panel between the exterior wall panel and the waterproof member, and a restricting part that is provided so as to be connected to the waterproof member from an upper surface of the roof base and restricts entry of water into the upper surface of the roof base and the exterior wall base, in which the exterior wall panel includes a panel lower end portion that is disposed above the restricting part at an interval and forms an air intake port communicating with the exterior wall ventilation passage between the panel lower end portion and the restricting part, and a connection passage that connects the roof ventilation passage and the exterior wall ventilation passage is formed on an inside of the restricting part.

[0062] In this configuration, the waterproof member and the restricting part can maintain the high waterproof performance from the roof to the exterior wall, and allow the air of the roof ventilation passage to flow into the exterior wall ventilation passage through the connection passage. Therefore, the air on the roof and the air on the upper floor can be discharged to the outside from the same ventilation passage, and generation of dew condensation in the roof ventilation passage and the exterior wall ventilation passage can be suppressed. At this time, since outside air flows into the exterior wall ventilation passage from the intake port between the lower end portion of the exterior wall panel and the restricting part, the air flowing in from the roof ventilation passage and the air flowing in from the inside of the exterior wall base can be quickly guided upward by the upward airflow. Furthermore, even when air containing moisture flows into the exterior wall ventilation passage from the roof ventilation passage through the connection passage in winter or the like, a relative humidity can be lowered by the outside air taken in from the intake port. Therefore, it is possible to stably suppress generation of dew condensation around the exterior wall ventilation passage due to the moisture of the air flowing in from the roof ventilation passage and the moisture of the air flowing in from the inside of the exterior wall.

[0063] A building according to a second aspect of the present invention is the building according to the first aspect, in which the connection passage desirably includes a main passage that has a lower end portion communicating with the roof ventilation passage and extends in the up-down direction on the inside of the restricting part, and a sub passage that communicates the main passage and the exterior wall ventilation passage in an inner-outer direction above the panel lower end portion.

[0064] In this configuration, the main passage can guide the air flowing in from the roof ventilation passage to the position above the panel lower end portion, and then the sub passage allows the air to flow into the exterior wall ventilation passage.

[0065] A building according to a third aspect of the present invention is the building according to the second aspect, in which the exterior wall base desirably includes a heat insulating material disposed on the inside of the restricting part, and the main passage desirably includes a heat insulating material groove formed in the heat insulating material along the up-down direction so as to face the restricting part.

[0066] This configuration can guide the air flowing in from the roof ventilation passage upward by using the heat insulating material groove formed in the heat insulating material.

[0067] A building according to a fourth aspect of the present invention is the building according to the second or third aspect, in which the exterior wall base desirably includes a support that supports the exterior wall panel, and the main passage desirably includes a support groove formed in the support along the up-down direction so as to face the restricting part.

[0068] This configuration can guide the air flowing in from the roof ventilation passage upward by using the support groove formed in the support.

[0069] A building according to a fifth aspect of the present invention is the building according to any one of the second to fourth aspects, in which the restricting part desirably includes a covering member disposed so as to cover the exterior wall base on an inside of the exterior wall panel, and the sub passage is desirably formed by a through hole formed so as to penetrate the covering member in the inner-outer direction.

[0070] This configuration allows the air in the main passage to flow into the exterior wall ventilation passage by using the through hole formed in the covering member.

[0071] A building according to a sixth aspect of the present invention is the building according to the fifth aspect, in which the covering member desirably includes a vertical portion that is disposed on the inside of the exterior wall panel so as to extend in the up-down direction along an outer surface of the exterior wall base and is provided with the through hole, and an inclined portion that is disposed so as to extend downward toward an outside from a lower end portion of the vertical portion and forms the intake port with the panel lower end portion.

[0072] In this configuration, the covering member can have a waterproof function for the exterior wall base, a function of allowing air to flow into the exterior wall ventilation passage from the main passage, and a function of taking outside air into the exterior wall ventilation passage.

[0073] A building according to a seventh aspect of the present invention is the building according to the sixth aspect, in which the covering member desirably further includes a protrusion protruding outward from at least one of an upper portion or a lower portion of the through hole so as to suppress entry of water into the through hole.

[0074] Even if water enters the periphery of the covering member from the exterior wall panel, this configuration can prevent the water from entering the through hole.

[0075] The present invention can prevent dew condensation from occurring in the ventilation passage and the periphery of the ventilation passage while maintaining the waterproof performance in the periphery of the connection portion between the lean-to and the exterior wall in a building having a lean-to structure.

Examples

Embodiment Construction

[0020]Hereinafter, a building 1 according to each embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic side sectional view of the building 1 according to an embodiment of the present invention. In each of the subsequent drawings including FIG. 1, a front-rear direction, a left-right direction, and an up-down direction are shown as necessary for ease of description, but these directions do not limit the present invention.

[0021]As shown in FIG. 1, the building 1 includes a lower wall portion 2, a roof 3, and an upper wall portion 4. The lower wall portion 2 is a wall extending in the up-down direction on a front side of the building 1. The roof 3 extends upward from an upper end portion of the lower wall portion 2 and covers the inside of the building 1. The upper wall portion 4 is erected so as to extend upward from an upper end portion (tip portion) of the roof 3. The roof 3 and the upper wall portion 4 are connected to each oth...

TECHNICAL FIELD

[0001] The present invention relates to a building having a lean-to structure.BACKGROUND ART

[0002] Conventionally, a building having a lean-to structure is known. The lean-to is disposed at a position lower than a roof of a purlin, and is disposed so as to protrude from the purlin.

[0003] Patent Literature 1 discloses a building having the lean-to structure as described above. In the building, an air layer continuous from the lean-to along an exterior wall of a second floor of the purlin is formed. The air layer on the lean-to is disposed to be inclined below a waterproofing sheet and a roofing board. On the other hand, the air layer on the exterior wall is disposed further on an inside of the moisture-permeable waterproofing sheet on an inside of the exterior wall. The two air layers formed on the inside of each of the roof and the exterior wall in this manner communicate with each other at an upper end portion of the lean-to. Such a structure allows air discharged from the first floor and an attic of the lean-to to be discharged to an outside from an upper end portion of the exterior wall of the second floor.CITATION LISTPatent Literature

[0004] Patent Literature 1: JP 2005-83142 A

[0005] In the technique described in Patent Literature 1, in winter, air containing a large amount of moisture that has flowed into the air layer on the lean-to from the first floor and the attic flows into the air layer on the exterior wall of the second floor. Since air containing moisture also flows into the air layer on the exterior wall of the second floor from an indoor side of the second floor, there is a problem that moisture in the air layer increases and the flow of air stagnates, and dew condensation easily occurs in the air layer and a heat insulating material adjacent to the air layer.SUMMARY OF INVENTION

[0006] An object of the present invention is to prevent dew condensation from occurring in a ventilation passage and a periphery of the ventilation passage while maintaining waterproof performance in a periphery of a connection portion between a lean-to and an exterior wall in a building having a lean-to structure.

[0007] The present invention provides a building. The building includes a roof having a roof base and a roof ventilation passage provided below the roof base along the roof base, an exterior wall erected on an end portion of the roof and including an exterior wall base, an exterior wall panel disposed on an outside of the exterior wall base, a waterproof member that is disposed on an outer surface of the exterior wall base so as to extend in an up-down direction and restricts entry of water into the exterior wall base, and an exterior wall ventilation passage provided along the exterior wall panel toward an upper end portion of the exterior wall panel between the exterior wall panel and the waterproof member, and a restricting part that is provided so as to be connected to the waterproof member from an upper surface of the roof base and restricts entry of water into the upper surface of the roof base and the exterior wall base, in which the exterior wall panel includes a panel lower end portion that is disposed above the restricting part at an interval and forms an air intake port communicating with the exterior wall ventilation passage between the panel lower end portion and the restricting part, and a connection passage that connects the roof ventilation passage and the exterior wall ventilation passage is formed on an inside of the restricting part.BRIEF DESCRIPTION OF DRAWINGS

[0008] FIG. 1 is a schematic side sectional view of a building according to an embodiment of the present invention.

[0009] FIG. 2 is a sectional view of a periphery of an upper end portion of a lean-to of a building according to an embodiment of the present invention.

[0010] FIG. 3 is an enlarged sectional view in which a part of FIG. 2 is enlarged.

[0011] FIG. 4A is a horizontal sectional view of a periphery of a connection passage of a building according to an embodiment of the present invention.

[0012] FIG. 4B is a front view of a periphery of a connection passage of a building according to an embodiment of the present invention.

[0013] FIG. 4C is a side sectional view of a vicinity of a connection passage of a building according to an embodiment of the present invention.

[0014] FIG. 5A is a front view of a flashing of a building according to an embodiment of the present invention.

[0015] FIG. 5B is a side view of a flashing of a building according to an embodiment of the present invention.

[0016] FIG. 6A is a horizontal sectional view of a periphery of a connection passage of a building according to a first modified embodiment of the present invention.

[0017] FIG. 6B is a front view of the periphery of the connection passage of the building according to the first modified embodiment of the present invention.

[0018] FIG. 6C is a side sectional view of the periphery of the connection passage of the building according to the first modified embodiment of the present invention.

[0019] FIG. 7 is a sectional view of a periphery of an upper end portion of a lean-to of a building according to a second modified embodiment of the present invention.DESCRIPTION OF EMBODIMENTS

[0020] Hereinafter, a building 1 according to each embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic side sectional view of the building 1 according to an embodiment of the present invention. In each of the subsequent drawings including FIG. 1, a front-rear direction, a left-right direction, and an up-down direction are shown as necessary for ease of description, but these directions do not limit the present invention.

[0021] As shown in FIG. 1, the building 1 includes a lower wall portion 2, a roof 3, and an upper wall portion 4. The lower wall portion 2 is a wall extending in the up-down direction on a front side of the building 1. The roof 3 extends upward from an upper end portion of the lower wall portion 2 and covers the inside of the building 1. The upper wall portion 4 is erected so as to extend upward from an upper end portion (tip portion) of the roof 3. The roof 3 and the upper wall portion 4 are connected to each other at a connection portion 5. As an example, the inside of the lower wall portion 2 constitutes a first floor of the building 1. The inside of the upper wall portion 4 constitutes a second floor of the building 1. In other words, in the present embodiment, the roof 3 is disposed below a roof (not shown) of a purlin and corresponds to a lean-to protruding from the purlin.

[0022] As shown in FIG. 1, a lower wall air passage 2A is formed on an inside of the lower wall portion 2, and an upper wall air passage 4A (exterior wall ventilation passage) is formed on an inside of the upper wall portion 4. A roof air passage 3A (roof ventilation passage) is formed on an inside of the roof 3. In the present embodiment, air in the lower wall air passage 2A flows into the roof air passage 3A and flows toward the connection portion 5. In the connection portion 5, the air flows into the upper wall air passage 4A. Air flows into the upper wall air passage 4A from the second floor of the building 1. The air in the upper wall air passage 4A is discharged to the outside at an upper end portion of the upper wall portion 4. Hereinafter, an inflow structure of air from the roof air passage 3A to the upper wall air passage 4A will be described in detail.

[0023] FIG. 2 is a sectional view of a periphery of the connection portion 5 of the building 1, and FIG. 3 is an enlarged sectional view in which a part of FIG. 2 is enlarged. The building 1 includes a roofing board 30, a heat insulating layer 31, a plurality of tiles 32, and a roofing 33.

[0024] The roofing board 30 corresponds to a roof base in the present embodiment. The roofing board 30 is disposed so as to be inclined upward toward the upper wall portion 4 (exterior wall). The roofing board 30 includes, for example, a wooden plate member. The roof air passage 3A is provided below the roofing board 30 along the roofing board 30.

[0025] The heat insulating layer 31 is disposed below the roofing board 30 at an interval. Although not shown in FIG. 2, the roofing board 30 is supported by a plurality of rafter members arranged at intervals in a direction orthogonal to the sheet surface of FIG. 2. Each of the rafter members is disposed so as to extend upward along the roofing board 30. The heat insulating layer 31 is disposed between adjacent rafter members or below the rafter members. The roof air passage 3A is formed between the roofing board 30 and the heat insulating layer 31.

[0026] The plurality of tiles 32 are disposed on the roofing board 30. Although two tiles 32 are shown in FIG. 2, the plurality of tiles 32 is further arranged in the front-rear direction and the left-right direction along the roof 3 in FIG. 1. The tiles 32 are engaged with a crosspiece 32H (FIG. 3) disposed on the roofing board 30.

[0027] The roofing 33 prevents water from entering an inside of the roofing board 30 and the upper wall portion 4. In the present embodiment, a roofing splice plate 33S (FIG. 3) including a metal plate is disposed on the roofing board 30 in advance, and the roofing 33 is disposed along the roofing splice plate 33S. The roofing 33 and the roofing splice plate 33S are disposed so as to be bent from an upper end portion of the roofing board 30 to a furring strip 54 described later.

[0028] An airtight sheet (not shown) is disposed below the heat insulating layer 31 or the like, and suppresses movement of moisture between the indoor and the outdoor through the roof 3.

[0029] Furthermore, the building 1 includes a pillar 40, a heat insulating material 41, a plasterboard 43, an exterior wall panel 46, a base material 47, a waterproofing sheet 48 (waterproof member), a heat insulating material 49, a heat insulating material 50, a base plate 51 (FIG. 3), a base wood 52, a crossrail 53, a furring strip 54 (support), a base furring strip 55, a flashing 56, a flashing 57, and a watertight material 58.

[0030] The pillar 40 constitutes a part of the upper wall portion 4. The pillar 40 is disposed so as to extend in the up-down direction. Although not shown in FIGS. 2 and 3, a plurality of pillars 40 is disposed at intervals in the left-right direction (direction orthogonal to the sheet of FIG. 2).

[0031] The heat insulating material 41 is disposed in a space between the plurality of pillars 40 adjacent in the left-right direction. The heat insulating material 41 may be a soft heat insulating material or a hard heat insulating material, and both the hard heat insulating material and the soft heat insulating material may be used. The heat insulating material 41 may be a foamable heat insulating material or a fiber heat insulating material. The same applies to a heat insulating material described later.

[0032] An airtight sheet (not shown) is disposed on an inner surface of each pillar 40 so as to extend in the up-down direction.

[0033] The plasterboard 43 (FIG. 2) is disposed on an inside of the pillar 40. The plasterboard 43 defines an indoor space inside the upper wall portion 4.

[0034] The exterior wall panel 46 constitutes an outer surface of the upper wall portion 4. As an example, the exterior wall panel 46 is a ceramic-based siding. The exterior wall panel 46 has a panel lower end portion 46S corresponding to a lower end portion of the exterior wall panel 46 (FIG. 3).

[0035] The base material 47 includes wood disposed on an inside of the exterior wall panel 46. The base material 47 is a member for supporting the exterior wall panel 46, and a thickness of the base material 47 forms a space for the upper wall air passage 4A.

[0036] The waterproofing sheet 48 is disposed on the inside of the exterior wall panel 46 and on outer surfaces of the heat insulating materials 49 and 50 so as to extend in the up-down direction. The waterproofing sheet 48 restricts and prevents water from entering the inside of the upper wall portion 4, particularly, the heat insulating materials 49 and 50, the base plate 51, and the like. The heat insulating materials 49 and 50 are disposed on the inside of the exterior wall panel 46, and have a function as so-called exterior heat insulation. The heat insulating material 50 extends to an upper end side of the upper wall portion 4 along the base plate 51.

[0037] The base plate 51 (FIG. 3) is disposed so as to extend in the up-down direction along an outer surface of the pillar 40 and an outer surface of the crossrail 53. The base plate 51 functions as a base of the heat insulating materials 49 and 50.

[0038] The base wood 52 (support) is disposed continuously in the left-right direction. The base wood 52 has a function of supporting the exterior wall panel 46 with the base material 47 interposed therebetween.

[0039] The crossrail 53 is disposed between the pillars 40 adjacent to each other in the left-right direction, and extends along the left-right direction. The crossrail 53 has a function of supporting the base plate 51 and the base wood 52.

[0040] The furring strip 54 is disposed below the base wood 52 so as to extend in the up-down direction. The furring strip 54 is fixed to the pillar 40 by a nail (not shown) and supports the base furring strip 55.

[0041] The base furring strip 55 (FIG. 3) is disposed below the exterior wall panel 46. Although not shown in FIGS. 2 and 3, the base furring strip 55 is fixed to the furring strip 54 by a nail (not shown). The base furring strip 55 has a function of supporting the flashings 56 and 57.

[0042] The flashing 56 prevents water from entering the inside of the roof 3 and the upper wall portion 4 through an upper surface of the uppermost tile 32 of the plurality of tiles 32. An upper end portion of the flashing 56 is connected to a lower end portion of the waterproofing sheet 48, and a waterproof line is formed by the upper end portion and the lower end portion. The waterproof line also includes the flashing 57 and also the roofing 33 described above (FIGS. 2 and 3). Note that the structure of the flashing 56 will be described later in detail. The flashing 57 is disposed on an inside of the flashing 56 and prevents water from entering the inside of the roof 3 and the upper wall portion 4 through the upper surface of the uppermost tile 32. A watertight material 58 is fixed to a tip of the flashing 57, and the watertight material 58 is disposed so as to be in close contact with the upper surface of the tile 32. As shown in FIG. 3, the flashings 56 and 57 are fixed to the base furring strip 55 by screws or fixing means (not shown).

[0043] In the present embodiment, the upper wall air passage 4A is provided along the exterior wall panel 46 toward an upper end portion of the exterior wall panel 46 between the exterior wall panel 46 and the waterproofing sheet 48. The heat insulating materials 49 and 50, the base plate 51, and the furring strip 54 constitute an exterior wall base G in the present embodiment. The exterior wall panel 46 is disposed on an outside of the exterior wall base G at an interval. Furthermore, the roofing 33, the base furring strip 55, and the flashings 56 and 57 function as restricting parts R. The restricting part R is provided so as to connect from an upper surface of the roofing board 30 to the waterproofing sheet 48, and restricts the entering of water to the exterior wall base G and the upper surface of the roofing board 30. As shown in FIG. 3, the panel lower end portion 46S of the exterior wall panel 46 is disposed above the flashing 56 at an interval, and forms an air intake port P communicating with the upper wall air passage 4A between the panel lower end portion and the flashing 56. In such a configuration, a connection passage Q that connects the roof air passage 3A and the upper wall air passage 4A is formed on an inside of the restricting part R.

[0044] The connection passage Q includes a main passage Q1 and a sub passage Q2 (FIG. 3). The main passage Q1 has a lower end portion communicating with the roof air passage 3A, and extends in the up-down direction on the inside of the restricting part R. On the other hand, the sub passage Q2 allows the main passage Q1 and the upper wall air passage 4A to communicate with each other in the front-rear direction (inner-outer direction) above the panel lower end portion 46S of the exterior wall panel 46.

[0045] FIG. 4A is a horizontal sectional view of a vicinity of the connection passage Q of the building 1 according to the present embodiment, FIG. 4B is a front view thereof, and FIG. 4C is a side sectional view thereof. In the present embodiment, the heat insulating material 49, the base wood 52, and the furring strip 54 constitute a main passage Q1 of the connection passage Q. Specifically, as described above, the plurality of furring strips 54 is arranged at intervals in the left-right direction. Note that a heat insulating material 54X is disposed between adjacent furring strips 54. An air slit 54H (support groove) is formed in each furring strip 54 extending in the up-down direction so as to face the restricting part R (FIG. 3). As shown in FIG. 4A, the air slit 54H is a groove formed in the furring strip 54 so as to extend in the up-down direction.

[0046] Similarly, a base wood slit 52H (support groove) is formed in the base wood 52 disposed above the furring strip 54. As shown in FIGS. 4B and 4C, the base wood slit 52H is a groove formed in the base wood 52 so as to extend in the up-down direction. Furthermore, a heat insulating material slit 49H (heat insulating material groove) is formed in the heat insulating material 49 disposed above the base wood 52. As shown in FIGS. 4B and 4C, the heat insulating material slit 49H is a groove formed in the heat insulating material 49 so as to extend in the up-down direction.

[0047] A lower end portion of the air slit 54H communicates with the roof air passage 3A. An upper end portion of the air slit 54H communicates with a lower end portion of the base wood slit 52H. An upper end portion of the base wood slit 52H communicates with a lower end portion of the heat insulating material slit 49H.

[0048] FIG. 5A is a front view of the flashing 56 (covering member) of the building according to the present embodiment, and FIG. 5B is a side view of the flashing 56. The flashing 56 is disposed to cover the exterior wall base G on the inside of the exterior wall panel 46. The flashing 56 is formed by bending a plate-shaped metal member, and includes a first vertical portion 56A (vertical portion), a first inclined portion 56B (inclined portion), a second inclined portion 56C (inclined portion), and a second vertical portion 56D. The first vertical portion 56A constitutes an upper portion of the flashing 56. A plurality of air slits 56H (through holes) is formed in the first vertical portion 56A at intervals in the left-right direction. Each of the air slits 56H extends in an elongated hole shape in the up-down direction. The air slit 56H has a shape not limited to the elongated hole shape, and may have other shapes such as a cross shape. The first inclined portion 56B is disposed so as to extend downward from a lower end portion of the first vertical portion 56A toward the outside. The second inclined portion 56C is connected to a lower end portion of the first inclined portion 56B via a slight step, and is disposed so as to extend downward toward the outside similarly to the first inclined portion 56B. The second vertical portion 56D extends downward from a lower end portion of the second inclined portion 56C. When the flashing 56 is supported by the base furring strip 55, the first vertical portion 56A is disposed to face the heat insulating material 49 and an upper portion of the base wood 52. On the other hand, the roofing splice plate 33S described above is disposed to face a lower portion of the crossrail 53 and the furring strip 54. As a result, the heat insulating material slit 49H, the base wood slit 52H, and the air slit 54H described above are closed from the outside, and an air passage is formed.

[0049] The flashing 56 further includes a first turnup portion 561 (protrusion), a second turnup portion 562 (protrusion), and a turndown portion 563. The first turnup portion 561 protrudes downward from an upper portion of the plurality of air slits 56H toward the outside. Similarly, the second turnup portion 562 protrudes downward from a lower portion of the plurality of air slits 56H toward the outside. The first turnup portion 561 and the second turnup portion 562 have a function of suppressing entry of water into the plurality of air slits 56H. The turndown portion 563 protrudes toward the inside from a lower end portion of the second vertical portion 56D. Note that a protruding direction of each of the turnup and turndown portions may be limited to a form shown in FIG. 5.

[0050] When the first vertical portion 56A of the flashing 56 is disposed to extend in the up-down direction along the outer surfaces of the heat insulating material 49 and the heat insulating material 50 on the inside of the exterior wall panel 46, the air slit 56H formed in the first vertical portion 56A is disposed to face the heat insulating material slit 49H in FIG. 4B. As a result, the air slit 56H forms the sub passage Q2, and the main passage Q1 and the upper wall air passage 4A communicate with each other in the inner-outer direction. On the other hand, as shown in FIG. 3, the first inclined portion 56B of the flashing 56 forms the intake port P with the panel lower end portion 46S of the exterior wall panel 46. Furthermore, a portion of the flashing 56 extending upward from the first turnup portion 561 receives the waterproofing sheet 48.

[0051] As described above, in the present embodiment, the waterproofing sheet 48 and the restricting part R can maintain high waterproof performance around the connection portion 5 from the roof 3 to the upper wall portion 4, and allow the air of the roof air passage 3A to flow into the upper wall air passage 4A through the connection passage Q. Therefore, the air on the roof 3 and the air on an upper floor can be discharged to the outside from the same ventilation passage, and generation of dew condensation in the roof air passage 3A and the upper wall air passage 4A can be suppressed. At this time, since outside air flows into the upper wall air passage 4A from the intake port P between the panel lower end portion 46S of the exterior wall panel 46 and the restricting part R, the air flowing in from the roof air passage 3A and the air flowing in from the inside of the exterior wall base G can be quickly guided upward by the upward airflow. Furthermore, even when air containing moisture flows into the upper wall air passage 4A from the roof air passage 3A through the connection passage Q in winter or the like, a relative humidity can be lowered by the outside air taken in from the intake port P. Therefore, it is possible to stably suppress generation of dew condensation around the upper wall air passage 4A due to the moisture of the air flowing in from the roof air passage 3A and the moisture of the air flowing in from the inside of the upper wall portion 4.

[0052] In the present embodiment, since the connection passage Q has the main passage Q1 and the sub passage Q2, the main passage Q1 can guide the air flowing in from the roof air passage 3A to a position above the panel lower end portion 46S, and then the sub passage Q2 allows the air to flow into the upper wall air passage 4A.

[0053] Furthermore, in the present embodiment, the main passage Q1 includes the heat insulating material slit 49H formed along the up-down direction in the heat insulating material 49 so as to face the restricting part R. Such a configuration can guide the air flowing in from the roof air passage 3A upward by using the heat insulating material slit 49H formed in the heat insulating material 49.

[0054] The main passage Q1 includes the base wood 52 so as to face the restricting part R, the base wood slit 52H formed along the up-down direction in the furring strip 54, and the air slit 54H. Such a configuration can guide the air flowing in from the roof air passage 3A upward by using each slit formed in the base wood 52 and the furring strip 54.

[0055] Furthermore, the present embodiment allows the air in the main passage Q1 to flow into the upper wall air passage 4A along the inner-outer direction by using the air slit 56H formed in the flashing 56.

[0056] In particular, the flashing 56, which has the first vertical portion 56A and the first inclined portion 56B, can have a waterproof function for the exterior wall base G, a function of allowing air to flow from the main passage Q1 into the upper wall air passage 4A, and a function of taking the outside air into the upper wall air passage 4A.

[0057] In the present embodiment, even if water enters a periphery of the flashing 56 from the exterior wall panel 46, the flashing 56, which has the first turnup portion 561 and the second turnup portion 562, can prevent the water from entering the air slit 56H. Note that the flashing 56 may have one of the first turnup portion 561 or the second turnup portion 562.

[0058] Although the building 1 according to an embodiment of the present invention has been described above, the present invention is not limited thereto, and for example, the following modified embodiments can be adopted.

[0059] (1) FIG. 6A is a horizontal sectional view of a vicinity of a connection passage of a building according to a first modified embodiment of the present invention, FIG. 6B is a front view thereof, and FIG. 6C is a side sectional view thereof. In the above embodiment, as shown in FIG. 4, the slits are formed in the furring strip 54, the base wood 52, and the heat insulating material 49 from the bottom, but the present invention is not limited to this form. As shown in FIG. 6, the main passage Q1 may be formed between the furring strips 54 adjacent to each other in the left-right direction. In this case, the air slit 54H is formed in the heat insulating material 54X, and sequentially communicates with the base wood slit 52H and the heat insulating material slit 49H similar to those in the embodiment described previously. In such a case, the air flowing in from the roof air passage 3A can be also guided upward.

[0060] (2) FIG. 7 is a sectional view of a periphery of an upper end portion of a lean-to of a building according to a second modified embodiment of the present invention. In the above embodiment, the description has been given in a form in which the building 1 has a so-called exterior heat insulating structure, but the building 1 is not required to have the structure. In FIG. 7, a plywood plate 73 is disposed on an outer surface of the heat insulating material 41 similar to the heat insulating material in FIG. 3. Then, the waterproofing sheet 48 is disposed on an outer surface of the plywood plate 73. The main passage Q1 of the connection passage Q is formed by an air spacer 71 and an air spacer 72 provided on the outer surface side of the heat insulating material 41 so as to sandwich the crossrail 53 from above and below in addition to the crossrail 53. The air slit 53H (not shown) is formed in the crossrail 53 in the up-down direction. On the other hand, the air spacer 71 and the air spacer 72 are constituted by an elastic member having a cell structure through which air passes. Also in the present modified embodiment, the air slit 56H of the flashing 56 is disposed so as to face the air spacer 71. Note that, in a case where the plywood plate 73 and the air spacer 71 are disposed so as to overlap each other, it is sufficient to form an air slit also in the plywood plate 73. In such a configuration, the air flowing into the main passage Q1 of the connection passage Q from the roof air passage 3A can flow into the upper wall air passage 4A through the main passage Q1 and the sub passage Q2.

[0061] The above specific embodiments of the present invention mainly include the invention having the following configurations. A building according to a first aspect of the present invention includes a roof having a roof base and a roof ventilation passage provided below the roof base along the roof base, an exterior wall erected on an end portion of the roof and including an exterior wall base, an exterior wall panel disposed on an outside of the exterior wall base, a waterproof member that is disposed on an outer surface of the exterior wall base so as to extend in an up-down direction and restricts entry of water into the exterior wall base, and an exterior wall ventilation passage provided along the exterior wall panel toward an upper end portion of the exterior wall panel between the exterior wall panel and the waterproof member, and a restricting part that is provided so as to be connected to the waterproof member from an upper surface of the roof base and restricts entry of water into the upper surface of the roof base and the exterior wall base, in which the exterior wall panel includes a panel lower end portion that is disposed above the restricting part at an interval and forms an air intake port communicating with the exterior wall ventilation passage between the panel lower end portion and the restricting part, and a connection passage that connects the roof ventilation passage and the exterior wall ventilation passage is formed on an inside of the restricting part.

[0062] In this configuration, the waterproof member and the restricting part can maintain the high waterproof performance from the roof to the exterior wall, and allow the air of the roof ventilation passage to flow into the exterior wall ventilation passage through the connection passage. Therefore, the air on the roof and the air on the upper floor can be discharged to the outside from the same ventilation passage, and generation of dew condensation in the roof ventilation passage and the exterior wall ventilation passage can be suppressed. At this time, since outside air flows into the exterior wall ventilation passage from the intake port between the lower end portion of the exterior wall panel and the restricting part, the air flowing in from the roof ventilation passage and the air flowing in from the inside of the exterior wall base can be quickly guided upward by the upward airflow. Furthermore, even when air containing moisture flows into the exterior wall ventilation passage from the roof ventilation passage through the connection passage in winter or the like, a relative humidity can be lowered by the outside air taken in from the intake port. Therefore, it is possible to stably suppress generation of dew condensation around the exterior wall ventilation passage due to the moisture of the air flowing in from the roof ventilation passage and the moisture of the air flowing in from the inside of the exterior wall.

[0063] A building according to a second aspect of the present invention is the building according to the first aspect, in which the connection passage desirably includes a main passage that has a lower end portion communicating with the roof ventilation passage and extends in the up-down direction on the inside of the restricting part, and a sub passage that communicates the main passage and the exterior wall ventilation passage in an inner-outer direction above the panel lower end portion.

[0064] In this configuration, the main passage can guide the air flowing in from the roof ventilation passage to the position above the panel lower end portion, and then the sub passage allows the air to flow into the exterior wall ventilation passage.

[0065] A building according to a third aspect of the present invention is the building according to the second aspect, in which the exterior wall base desirably includes a heat insulating material disposed on the inside of the restricting part, and the main passage desirably includes a heat insulating material groove formed in the heat insulating material along the up-down direction so as to face the restricting part.

[0066] This configuration can guide the air flowing in from the roof ventilation passage upward by using the heat insulating material groove formed in the heat insulating material.

[0067] A building according to a fourth aspect of the present invention is the building according to the second or third aspect, in which the exterior wall base desirably includes a support that supports the exterior wall panel, and the main passage desirably includes a support groove formed in the support along the up-down direction so as to face the restricting part.

[0068] This configuration can guide the air flowing in from the roof ventilation passage upward by using the support groove formed in the support.

[0069] A building according to a fifth aspect of the present invention is the building according to any one of the second to fourth aspects, in which the restricting part desirably includes a covering member disposed so as to cover the exterior wall base on an inside of the exterior wall panel, and the sub passage is desirably formed by a through hole formed so as to penetrate the covering member in the inner-outer direction.

[0070] This configuration allows the air in the main passage to flow into the exterior wall ventilation passage by using the through hole formed in the covering member.

[0071] A building according to a sixth aspect of the present invention is the building according to the fifth aspect, in which the covering member desirably includes a vertical portion that is disposed on the inside of the exterior wall panel so as to extend in the up-down direction along an outer surface of the exterior wall base and is provided with the through hole, and an inclined portion that is disposed so as to extend downward toward an outside from a lower end portion of the vertical portion and forms the intake port with the panel lower end portion.

[0072] In this configuration, the covering member can have a waterproof function for the exterior wall base, a function of allowing air to flow into the exterior wall ventilation passage from the main passage, and a function of taking outside air into the exterior wall ventilation passage.

[0073] A building according to a seventh aspect of the present invention is the building according to the sixth aspect, in which the covering member desirably further includes a protrusion protruding outward from at least one of an upper portion or a lower portion of the through hole so as to suppress entry of water into the through hole.

[0074] Even if water enters the periphery of the covering member from the exterior wall panel, this configuration can prevent the water from entering the through hole.

[0075] The present invention can prevent dew condensation from occurring in the ventilation passage and the periphery of the ventilation passage while maintaining the waterproof performance in the periphery of the connection portion between the lean-to and the exterior wall in a building having a lean-to structure.

Examples

Embodiment Construction

[0020]Hereinafter, a building 1 according to each embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic side sectional view of the building 1 according to an embodiment of the present invention. In each of the subsequent drawings including FIG. 1, a front-rear direction, a left-right direction, and an up-down direction are shown as necessary for ease of description, but these directions do not limit the present invention.

[0021]As shown in FIG. 1, the building 1 includes a lower wall portion 2, a roof 3, and an upper wall portion 4. The lower wall portion 2 is a wall extending in the up-down direction on a front side of the building 1. The roof 3 extends upward from an upper end portion of the lower wall portion 2 and covers the inside of the building 1. The upper wall portion 4 is erected so as to extend upward from an upper end portion (tip portion) of the roof 3. The roof 3 and the upper wall portion 4 are connected to each oth...

Claims

1. A building comprising:a roof having a roof base and a roof ventilation passage provided below the roof base along the roof base;an exterior wall erected on an end portion of the roof and including an exterior wall base, an exterior wall panel disposed on an outside of the exterior wall base, a waterproof member that is disposed on an outer surface of the exterior wall base so as to extend in an up-down direction and restricts entry of water into the exterior wall base, and an exterior wall ventilation passage provided along the exterior wall panel toward an upper end portion of the exterior wall panel between the exterior wall panel and the waterproof member; anda restricting part that is provided so as to be connected to the waterproof member from an upper surface of the roof base and restricts entry of water into the upper surface of the roof base and the exterior wall base,wherein the exterior wall panel includes a panel lower end portion that is disposed above the restricting part at an interval and forms an air intake port communicating with the exterior wall ventilation passage between the panel lower end portion and the restricting part, anda connection passage that connects the roof ventilation passage and the exterior wall ventilation passage is formed on an inside of the restricting part.

2. The building according to claim 1, whereinthe connection passage includesa main passage that has a lower end portion communicating with the roof ventilation passage and extends in the up-down direction on the inside of the restricting part, anda sub passage that communicates the main passage and the exterior wall ventilation passage in an inner-outer direction above the panel lower end portion.

3. The building according to claim 2, whereinthe exterior wall base includes a heat insulating material disposed on the inside of the restricting part, andthe main passage includes a heat insulating material groove formed in the heat insulating material along the up-down direction so as to face the restricting part.

4. The building according to claim 2, whereinthe exterior wall base includes a support that supports the exterior wall panel, andthe main passage includes a support groove formed in the support along the up-down direction so as to face the restricting part.

5. The building according to claim 2, whereinthe restricting part includes a covering member disposed so as to cover the exterior wall base on an inside of the exterior wall panel, andthe sub passage is formed by a through hole formed so as to penetrate the covering member in the inner-outer direction.

6. The building according to claim 5, whereinthe covering member includesa vertical portion that is disposed on the inside of the exterior wall panel so as to extend in the up-down direction along an outer surface of the exterior wall base and is provided with the through hole, andan inclined portion that is disposed so as to extend downward toward an outside from a lower end portion of the vertical portion and forms the intake port with the panel lower end portion.

7. The building according to claim 6, wherein the covering member further includes a protrusion protruding outward from at least one of an upper portion or a lower portion of the through hole so as to suppress entry of water into the through hole.

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