Eaves ventilation structure and ventilation device

Abstract

The objective is to provide a soffit ventilation structure and ventilation device that can be suitably installed on the upstream side of a single-slope roof and have excellent ventilation and waterproofing performance. [Solution] The ventilation device 1 consists of a frame member 10 having a first wall portion 11 and a second wall portion 13 that face each other and extend vertically, a bottom portion 12 connected to the lower ends of the first wall portion 11 and the second wall portion 13 and having a plurality of openings 18 formed at predetermined intervals in the longitudinal direction, an inclined portion 14 connected to the upper end of the second wall portion 13 and extending inclined diagonally downward, and a third wall portion 15 connected to the indoor end of the inclined portion 14 and extending vertically, and a ventilation member 30 that is attached between the inner surface of the first wall portion 11 and the inner surface of the second wall portion 13, extends in the longitudinal direction and has a ventilation function in the vertical direction. In addition, a projection 16 that protrudes horizontally toward the outdoors is provided on the upper end of the first wall portion 11, and a water-stopping material 17 is provided on the upper surface of the projection 16.

Description

Technical Field

[0001] The present invention relates to an eaves ventilation structure and a ventilation device, and particularly to an eaves ventilation structure and a ventilation device installed between an outer wall material and a frieze on the upper water side of a house having a single-flow roof.

Background Art

[0002] In recent years, houses with a single-flow roof and a short eaves have been increasing in terms of design and ensuring a wide living space. As a ventilation device installed in the eaves part of such a house, for example, there is one as shown in Patent Document 1.

[0003] FIG. 11 is a schematic cross-sectional view of a conventional eaves ventilation structure shown in Patent Document 1, and FIG. 12 is a schematic side view showing the mounting state of the eaves ventilation structure shown in FIG. 11 on the upper water side eaves part.

[0004] First, referring to FIG. 11, the ventilation device 271 is composed of a frame member 280 made of a steel plate material and a ventilation member 300 mounted in the frame member 280.

[0005] The frame member 280 has a first wall surface portion 281 and a second wall surface portion 283 that extend vertically in opposite directions, a bottom surface portion 282 connected to the lower end sides of the first wall surface portion 281 and the second wall surface portion 283 and having a plurality of openings 288 formed at predetermined intervals in the longitudinal direction, a horizontal portion 284 to which the upper end of the second wall surface portion 283 is connected and extends horizontally toward the indoor side, and a third wall surface portion 285 connected to the indoor side of the horizontal portion 284 and extending vertically downward. A bent piece 287 that extends horizontally toward the indoor side is provided at the upper end of the first wall surface portion 281.

[0006] The ventilation member 300 consists of a lower ventilation passage forming section 301, an upper ventilation passage forming section 303, and a connecting section 302 that connects them. Each of the lower ventilation passage forming section 301, the connecting section 302, and the upper ventilation passage forming section 303 is provided with a first ventilation opening 307, a second ventilation opening 308, and a third ventilation opening 309 that allow air to vent vertically at a first position 304, a second position 305, and a third position 306, respectively. Furthermore, the second position 305 is positioned so as not to completely overlap with either the first position 304 or the third position 306 in a plan view.

[0007] Next, referring to Figure 12, the state in which the soffit ventilation structure 275 is attached to the soffit portion on the upstream side of a single-slope roof will be described. When installing the ventilation device 271, first, multiple furring strips 312 are attached to the outer surface of the exterior wall substrate 311 at predetermined intervals in the longitudinal direction (depth direction relative to the indoor / outdoor direction in the figure). Also, a drip edge 317 is attached to cover the upstream end of the roof substrate 316. Next, the ventilation device 271 is inserted from below between the furring strips 312 and the drip edge 317, and the third wall portion 285 of the ventilation device 271 is positioned so that it abuts the furring strip 312 and the upper surface of the bent piece 287 abuts the lower surface of the roof substrate 316. After that, the ventilation device 271 is fixed to the exterior wall substrate 311 and furring strips 312 by screwing it to the third wall portion 285. Next, the exterior wall material 319 is inserted into the space formed by the second wall section 283 and the third wall section 285, and the exterior wall material 319 is attached to the furring strip 312 by screwing it through the third wall section 285. Once the installation of the ventilation device 271 is complete, the gap in the soffit portion between the upper end of the exterior wall material 319 and the lower surface of the flashing 317 is closed. [Prior art documents] [Patent Documents]

[0008] [Patent Document 1] Patent No. 7262158 [Overview of the project] [Problems that the invention aims to solve]

[0009] The conventional ventilation device 271 described above, as shown in Patent Document 1, has excellent waterproofing performance in addition to ventilation performance because the airflow is disturbed each time air passes through the first vent 307, second vent 308, and third vent 309, making it difficult for rainwater to penetrate. Furthermore, it is easy to use because the same shape can be installed around the entire perimeter of the soffit in both gable and non-gable configurations. However, in the case of a non-gable configuration, the ventilation device 271 is installed so as to abut the underside of the roof underlayment 316. While this is applicable to roofs with a slope of up to 1 inch on the upstream side of a single-slope roof, for example, in the case of a roof with a slope greater than 1 inch (represented here as a 3-inch slope roof) as shown by the dashed line in Figure 12, the space S between the underside of the roof underlayment 316 and the horizontal part 284 becomes narrow, or the horizontal part 284 may come into contact with the underside of the roof underlayment 316, so there was room for improvement.

[0010] This invention was made to solve the above-mentioned problems, and aims to provide a soffit ventilation structure and ventilation device that can be suitably installed on the upstream side of a single-slope roof and has excellent ventilation and waterproofing performance. [Means for solving the problem]

[0011] To achieve the above objective, the invention described in claim 1 is a soffit ventilation structure installed on the upstream side of a single-slope roof in the portion between the exterior wall material and the decorative trim, comprising: a first wall surface portion extending vertically below the roof decking of the single-slope roof; a bottom surface portion connected to the lower end of the first wall surface portion and extending horizontally toward the interior, with a plurality of openings formed at predetermined intervals in the longitudinal direction; a second wall surface portion connected to the interior end of the bottom surface portion and extending upward to the height of an intermediate position of the first wall surface portion at a position separated from the first wall surface portion toward the interior; a ventilation space forming portion connected to the upper end of the second wall surface portion and extending so as to incline downward toward the interior, forming a ventilation space between itself and the roof decking; and a ventilation member disposed between the inner surface of the first wall surface portion and the inner surface of the second wall surface portion, extending in the longitudinal direction, and having a ventilation function in the vertical direction.

[0012] This configuration ensures that air can reliably pass through the ventilation space.

[0013] The invention described in claim 2 is configured such that, in the configuration of the invention described in claim 1, the ventilation space forming portion is configured to have the same angle of inclination as the angle of inclination of the single-slope roof with respect to the horizontal direction.

[0014] With this configuration, the height distance between the underside of the roof sheathing and the ventilation space forming section becomes constant.

[0015] The invention described in claim 3 is configured such that, in the configuration of the invention described in claim 1, the ventilation space forming portion is configured to have a large inclination angle with respect to the inclination angle of the single-slope roof with respect to the horizontal direction.

[0016] With this configuration, the height distance between the underside of the roof sheathing and the ventilation space formation area increases as you move from the outside towards the inside.

[0017] The invention described in claim 4 is the configuration of the invention described in claim 1, wherein a projection is provided on the upper end side of the first wall surface that protrudes horizontally toward the outdoors.

[0018] This configuration prevents rainwater from seeping in through the space between the arabesque pattern and the first wall surface.

[0019] The invention described in claim 5 is the configuration of the invention described in claim 4, wherein the protruding portion is provided with a water-stopping material on its upper surface that abuts against the lower surface of the roof sheathing.

[0020] This configuration prevents rainwater from entering the ventilation space between the underside of the roof sheathing and the protruding part.

[0021] The invention described in claim 6 is the configuration of the invention described in claim 1, wherein the frame member has a third wall portion that is connected to the indoor end of the ventilation space forming portion and extends vertically along the indoor side of the exterior wall material at a position separated from the second wall portion toward the indoor side.

[0022] With such a configuration, at least a part of the third wall surface portion is covered by the outer wall material.

[0023] The invention according to claim 7 is the invention according to claim 1, wherein the ventilation member extends from the first wall surface portion toward the second wall surface portion at positions vertically spaced above the bottom surface portion, and includes a lower ventilation passage forming portion and an upper ventilation passage forming portion that form a ventilation passage, and an intermediate ventilation passage forming portion that is connected to each of the lower ventilation passage forming portion and the upper ventilation passage forming portion between the lower ventilation passage forming portion and the upper ventilation passage forming portion. The lower ventilation passage forming portion is provided with a lower ventilation port that can ventilate vertically on the first wall surface portion side rather than the intermediate position of the lower ventilation passage forming portion when viewed in the vertical direction. The intermediate ventilation passage forming portion is provided with an intermediate ventilation port that can ventilate vertically on the second wall surface portion side rather than the intermediate position of the intermediate ventilation passage forming portion when viewed in the vertical direction. The upper ventilation passage forming portion is provided with an upper ventilation port that can ventilate vertically on the first wall surface portion side rather than the intermediate position of the upper ventilation passage forming portion when viewed in the vertical direction.

[0024] With such a configuration, each time air passes through the lower ventilation port, the intermediate ventilation port, and the upper ventilation port, the air flow is disturbed, making it difficult for rainwater to penetrate.

[0025] The invention according to claim 8 is a ventilation device used for natural ventilation of a house through the eaves above the water surface of a single-slope roof, comprising a first wall surface portion and a second wall surface portion that extend vertically facing each other, a bottom surface portion connected to each of the lower end portions of the first wall surface portion and the second wall surface portion, with a plurality of openings formed at a predetermined interval in the longitudinal direction, and a frame member connected to one upper end side of the first wall surface portion and the second wall surface portion, and extending obliquely downward. The ventilation device further comprises a ventilation member disposed between the inner surfaces of the first wall surface portion and the second wall surface portion, extending in the longitudinal direction, and having a ventilation function in the vertical direction.

[0026] With such a configuration, a ventilation space is formed between the single-slope roof and the inclined portion.

[0027] The invention according to claim 9 is the invention according to claim 8, wherein a protruding portion that protrudes horizontally toward the outdoor side is provided on the upper end side of the first wall surface portion.

[0028] With such a configuration, the protruding portion serves as a water return, preventing rainwater from entering from below.

[0029] The invention according to claim 10 is the invention according to claim 9, wherein a water stop material that abuts against the lower surface of the single - flow roof is provided on the upper surface of the protruding portion. With such a configuration, it is possible to prevent rainwater from entering the ventilation space along the lower surface of the single - flow roof.

Effect of the Invention

[0030] As described above, in the invention according to claim 1, since air can surely pass through the ventilation space, the ventilation performance is improved.

[0031] In addition to the effect of the invention according to claim 1, in the invention according to claim 2, since the height - direction distance between the lower surface of the field board and the ventilation - space forming portion is constant, the ventilation performance is further improved.

[0032] In addition to the effect of the invention according to claim 1, in the invention according to claim 3, since the height - direction distance between the lower surface of the field board and the ventilation - space forming portion increases from the outdoor side toward the indoor side, it can be suitably used even when the roof slope is large, and it is easy to apply to roofs with various slopes.

[0033] In addition to the effect of the invention according to claim 1, in the invention according to claim 4, since it is possible to prevent rainwater from entering from the space between the arabesque and the first wall surface portion, the waterproof performance is improved.

[0034] In addition to the effect of the invention according to claim 4, in the invention according to claim 5, since it is possible to prevent rainwater from entering the ventilation space from between the lower surface of the field board and the protruding portion, the waterproof performance is further improved.

[0035] In addition to the effects of the invention described in claim 1, the invention described in claim 6 provides a stable installation state for the soffit ventilation structure because at least a portion of the third wall surface is covered by the exterior wall material.

[0036] In addition to the effects of the invention described in claim 1, the invention described in claim 7 improves waterproofing performance because the airflow is disturbed each time air passes through the lower vent, intermediate vent, and upper vent, making it difficult for rainwater to penetrate.

[0037] The invention described in claim 8 improves ventilation performance because a ventilation space is formed between the single-slope roof and the sloping section.

[0038] In addition to the effects of the invention described in claim 8, the invention described in claim 9 has improved waterproofing performance because the protruding portion acts as a water barrier, preventing rainwater from entering from below.

[0039] In addition to the effects of the invention described in claim 9, the invention described in claim 10 can prevent rainwater from entering the ventilation space by traveling along the underside of the single-slope roof, thus further improving waterproofing performance. [Brief explanation of the drawing]

[0040] [Figure 1] This is a schematic perspective view of a ventilation device according to the first embodiment of the present invention. [Figure 2] This is an enlarged cross-sectional view of the II-II line shown in Figure 1. [Figure 3] Figure 1 is an enlarged perspective view that schematically shows the external shape of the ventilation components included in the ventilation system. [Figure 4] This diagram shows the first installation process, in which the ventilation device shown in Figure 1 is attached to the soffit portion on the water-facing side to construct a soffit ventilation structure. [Figure 5] This diagram shows the second installation process, in which the ventilation device shown in Figure 1 is attached to the soffit on the upstream side to construct the soffit ventilation structure. [Figure 6] Figure 5 is a schematic side view showing the airflow and rainwater movement of the soffit ventilation structure. [Figure 7]This is a schematic side view showing a state in which a ventilation device according to the second embodiment of this invention is attached to the soffit portion on the upstream side of a roof with a different slope than that of the first embodiment, thereby constructing a soffit ventilation structure, and corresponds to Figure 6. [Figure 8] The following are cross-sectional views of ventilation devices corresponding to Figure 2 according to the third to sixth embodiments of the present invention, where (1) is a diagram relating to the third embodiment, (2) is a diagram relating to the fourth embodiment, (3) is a diagram relating to the fifth embodiment, and (4) is a diagram relating to the sixth embodiment. [Figure 9] These are partial cross-sectional views of ventilation devices according to the seventh to ninth embodiments of the present invention, where (1) is a diagram relating to the seventh embodiment, (2) is a diagram relating to the eighth embodiment, and (3) is a diagram relating to the ninth embodiment. [Figure 10] These are partial cross-sectional views of ventilation devices according to the 10th to 13th embodiments of the present invention, where (1) is a diagram relating to the 10th embodiment, (2) is a diagram relating to the 11th embodiment, (3) is a diagram relating to the 12th embodiment, and (4) is a diagram relating to the 13th embodiment. [Figure 11] This is a schematic cross-sectional view of a conventional soffit ventilation structure shown in Patent Document 1. [Figure 12] This is a schematic side view showing the installation of the soffit ventilation structure shown in Figure 11 to the upstream soffit portion. [Modes for carrying out the invention]

[0041] Figure 1 is a schematic perspective view of a ventilation device according to the first embodiment of the present invention, and Figure 2 is an enlarged cross-sectional view of the line II-II shown in Figure 1.

[0042] Referring to Figures 1 and 2, the ventilation device 1 is used for natural ventilation of a house through the eaves on the upstream side of a single-slope roof, and comprises a frame member 10 formed by pressing steel plates and a ventilation member 20 formed by pressing steel plates.

[0043] The frame member 10 has a first wall portion 11 and a second wall portion 13 that face each other and extend vertically, a bottom portion 12 connected to the lower ends of the first wall portion 11 and the second wall portion 13, with a plurality of openings 18 formed at predetermined intervals in the longitudinal direction, an inclined portion 14 connected to the upper end of the second wall portion 13 and extending inclined downwards, and a third wall portion 15 connected to the indoor end of the inclined portion 14 and extending vertically at a position separated from the second wall portion 13 towards the indoor side.

[0044] The second wall section 13 is connected to the indoor end of the bottom section 12 and extends upward to the height of an intermediate position on the first wall section 11, at a position separated from the first wall section 11 on the indoor side.

[0045] The inclined section 14 is formed with an inclination angle θ1 of approximately 33° with respect to the horizontal direction. This is configured to have the same inclination angle with respect to the horizontal direction as the 6.5-inch slope single-slope roof on which the ventilation device 1 is installed, as will be described in more detail later. In this first embodiment, the inclination angle θ1 of the inclined section 14 with respect to the horizontal direction is formed to be approximately 33°, but an angle in the range of 8° to 45° is preferable.

[0046] The openings 18 are rectangular in shape, and 43 of them are grouped together, with a certain gap between each group and evenly spaced out.

[0047] A projection 16 is provided at the upper end of the first wall section 11, projecting horizontally toward the outside, and a waterproofing material 17 made of ethylene propylene rubber (EPDM) is provided on the upper surface of the projection 16. This waterproofing material 17 provides waterproofing by contacting the underside of the roof decking of the single-slope roof, which will be described later. A folded-over section 19 is provided at the lower end of the third wall section 15, which is folded back toward the outside for the purpose of reinforcement and injury prevention.

[0048] Figure 3 is an enlarged perspective view that schematically shows the external shape of the ventilation components included in the ventilation system shown in Figure 1.

[0049] Referring in conjunction with Figures 1 and 2, and also with Figure 3, the ventilation member 20 is positioned between the inner surface of the first wall portion 11 and the inner surface of the second wall portion 13 of the frame member 10, extends in the longitudinal direction, and has a ventilation function in the vertical direction. The ventilation member 20 has a lower ventilation passage forming portion 21 and an upper ventilation passage forming portion 23 that extend from the first wall portion 11 toward the second wall portion 13 at positions separated vertically above the bottom portion 12 and form a ventilation passage, and an intermediate ventilation passage forming portion 22 that extends between the lower ventilation passage forming portion 31 and the upper ventilation passage forming portion 23 and connects to the lower ventilation passage forming portion 21 and the upper ventilation passage forming portion 23, respectively. The lower ventilation passage forming section 21 extends horizontally from the second wall surface section 13 toward the first wall surface section 11, the upper ventilation passage forming section 23 extends diagonally upward from the first wall surface section 11 toward the second wall surface section 13, and the intermediate ventilation passage forming section 22 is connected to the end of the lower ventilation passage forming section 21 on the side of the second wall surface section 13 and the end of the upper ventilation passage forming section 23 on the side of the first wall surface section 11, and extends diagonally.

[0050] The lower ventilation passage forming section 21 is provided with a lower ventilation opening 24 that allows air to vent vertically on the side of the first wall surface 11, beyond the midpoint of the lower ventilation passage forming section 21 indicated by the dashed-dotted line C1 in a vertical view. The lower ventilation opening 24 is formed by the lower ventilation passage forming section 21 extending horizontally from the inner surface of the second wall surface 13 toward the first wall surface 11 at intervals. The intermediate ventilation passage forming section 22 is provided with an intermediate ventilation opening 25 that allows air to vent vertically on the side of the second wall surface 13, beyond the midpoint of the intermediate ventilation passage forming section 22 indicated by the dashed-dotted line C1 in a vertical view. The intermediate ventilation opening 25 consists of a plurality of rectangular openings. The upper ventilation passage forming section 23 is provided with an upper ventilation opening 26 that allows air to vent vertically on the side of the first wall surface 11 of the upper ventilation passage forming section 23, indicated by the dashed-dotted line C1 in a vertical view. The upper ventilation opening 26, like the intermediate ventilation opening 25, consists of multiple rectangular openings.

[0051] An attachment portion 27 for attaching the ventilation member 20 to the frame member 10 is formed at the end of the upper ventilation passage forming portion 23 on the side of the second wall portion 13. The attachment portion 27 extends along the inclined portion 14 and the third wall portion 15, and is attached to the upper surface of the inclined portion 14 and the upper part of the indoor side surface of the third wall portion 15 of the frame member 10 by being attached with double-sided tape or adhesive. This makes it easy to attach the ventilation member 20 to the frame member 10, thus reducing the time required to combine the ventilation member 20 and the frame member 10.

[0052] The effects of configuring ventilation device 1 as described above will be discussed later.

[0053] Next, we will explain how to attach the ventilation device 1 configured in this way to the soffit.

[0054] Figure 4 is a detail diagram showing the first installation process, in which the ventilation device shown in Figure 1 is attached to the soffit on the upstream side to construct a soffit ventilation structure.

[0055] Referring to Figure 4, the single-slope roof 49 in this first embodiment has a slope of 6.5 inches. This single-slope roof 49 with a 6.5-inch slope has an inclination angle θ2 of approximately 33° with respect to the horizontal. First, multiple furring strips 42 are attached to the outer surface of the exterior wall substrate 41 at predetermined intervals in the longitudinal direction (depth direction relative to the indoor / outdoor direction in the figure). In addition, a semi-waterproofing cut 46 is attached to cover the upper end of the roof sheathing board 45. Furthermore, roofing material 47 is laid on the upper surface of the roof sheathing board 45 and the semi-waterproofing cut 46, and a decorative trim 48 is attached on top of it.

[0056] Figure 5 is a detail diagram showing the second installation process, in which the ventilation device shown in Figure 1 is attached to the soffit on the upstream side to construct the soffit ventilation structure.

[0057] Next, the ventilation device 1 is inserted between the furring strip 42 and the decorative trim 48, and positioned by aligning a part of the indoor side surface of the third wall section 15 and the indoor side surface of the part of the mounting section 27 that covers the third wall section 15 with the furring strip 42, and pressing the waterproofing material 17 against the underside of the roof sheathing board 45. In this embodiment, since the roof sheathing board 45 is provided with a semi-waterproof cut 46, the waterproofing material 17 is effectively pressed against the underside of the semi-waterproof cut 46. After positioning the ventilation device 1, it is fixed to the exterior wall base material 41 and furring strip 42 by screwing it to the third wall section 15. Then, the inclined section 14 becomes a ventilation space forming section 34, forming a ventilation space 36 between it and the underside of the roof sheathing board 45.

[0058] Next, the exterior wall material 43 is inserted from below into the space formed by the second wall portion 13, the inclined portion 14, and the third wall portion 15 of the ventilation device 1, and moved upward. As a result, the exterior wall material 43 is sandwiched between the second wall portion 13 and the third wall portion 15 of the ventilation device 1. In addition, at least a portion of the third wall portion 15 is covered by the exterior wall material 43, so the installation state of the soffit ventilation structure 5 is stabilized. By installing the ventilation device 1 in this way, the construction of the soffit ventilation structure 5 is completed. Figure 6 is a schematic side view showing the airflow and rainwater movement of the soffit ventilation structure shown in Figure 5.

[0059] Referring to Figure 6, since the soffit ventilation structure 5 is located on the upstream side of the house, the air that has passed through the attic space of the house in Figure 6 and the air that has risen inside the exterior wall flows in through the ventilation space 36 and the upper vent 26 of the ventilation device 1, as indicated by arrow A1, and moves outdoors by passing through the intermediate vent 25, the lower vent 24, and the opening 18 in that order.

[0060] In this case, as described above, the ventilation device 1 and the soffit ventilation structure 5 have an inclined portion 14 (ventilation space forming portion 34) that is connected to the upper end side of the second wall portion 13 and extends downward toward the indoor side. As a result, a ventilation space 36 is formed between the single-slope roof 49 and the inclined portion 14 (ventilation space forming portion 34), and air can reliably pass through the ventilation space 36. Therefore, the ventilation performance is improved.

[0061] Furthermore, as described above, the inclined section 14 (ventilation space forming section 34) is configured such that its inclination angle θ1 with respect to the horizontal is approximately 33°, which is the same angle as the inclination angle θ2 with respect to the horizontal of the single-slope roof 49 with a 6.5-inch slope. As a result, the height distance L1 between the lower surface of the roof sheathing 45 and the inclined section 14 (ventilation space forming section 34) remains constant, further improving ventilation performance.

[0062] Furthermore, the ventilation device 1 and the soffit ventilation structure 5 are provided with protruding parts 16, which act as a water barrier, preventing rainwater from entering from below, thus improving the waterproofing performance of the ventilation device 1. In addition, the waterproofing performance of the soffit ventilation structure 5 is improved because it prevents rainwater from entering through the space between the eaves 48 and the first wall surface 11.

[0063] Furthermore, the ventilation device 1 and the soffit ventilation structure 5 are provided with a water-stopping material 17, which prevents rainwater from entering the ventilation space 36 by traveling along the underside of the single-slope roof 49, thus further improving the waterproofing performance of the ventilation device 1. In addition, the soffit ventilation structure 5 is further improved because it prevents rainwater from entering the ventilation space 36 from the gap between the underside of the roof decking 45 (semi-waterproof cut 46) and the protruding part 16.

[0064] Furthermore, as described above, since the upper vent 26 is located on the first wall section 11 side, the intermediate vent 25 on the second wall section 13 side, and the lower vent 24 on the first wall section 11 side, the direction of airflow changes each time air passes through the upper vent 26, intermediate vent 25, and lower vent 24. As a result, the airflow in the ventilation device 1 and the soffit ventilation structure 5 is disturbed each time air passes through the upper vent 26, intermediate vent 25, and lower vent 24, making it difficult for rainwater to penetrate, thus improving the waterproofing performance of the ventilation device 1 and the soffit ventilation structure 5.

[0065] Furthermore, as described above, the downward ventilation passage forming section 21 extends horizontally to cover a portion of the upper part of the bottom surface 12 of the frame member 10. This makes it easier for rainwater that has entered through the opening 18 of the frame member 10 to be repelled by the downward ventilation passage forming section 21, and also provides excellent drainage at the end of the downward ventilation passage forming section 21 (the boundary with the downward ventilation opening 24). As a result, the waterproofing performance of the ventilation device 1 and the soffit ventilation structure 5 is further improved.

[0066] Furthermore, since the intermediate ventilation passage forming section 22 is inclined as described above, even if rainwater penetrates above the intermediate ventilation passage forming section 22, the penetrated rainwater can easily flow along the upper surface of the intermediate ventilation passage forming section 22 towards the intermediate ventilation opening 25. As a result, rainwater that penetrates above the intermediate ventilation passage forming section 22 is more easily discharged from the intermediate ventilation opening 25, further improving the waterproofing performance of the ventilation device 1 and the soffit ventilation structure 5.

[0067] Furthermore, as described above, the upper ventilation channel forming section 23 is inclined, so even if rainwater penetrates above the upper ventilation channel forming section 23, the penetrated rainwater is more likely to flow along the upper surface of the upper ventilation channel forming section 23 towards the upper ventilation opening 26. As a result, rainwater that penetrates above the upper ventilation channel forming section 23 is more likely to flow downward along the upper surface of the upper ventilation channel forming section 23 and then be easily discharged from the upper ventilation opening 26, further improving the waterproofing performance of the ventilation device 1 and the soffit ventilation structure 5.

[0068] FIG. 7 is a schematic side view showing a state in which a ventilation device according to a second embodiment of the present invention is attached to an eaves portion above the water surface of a roof having a different gradient from that of the first embodiment to construct an eaves ventilation structure, and is a figure corresponding to FIG. 6.

[0069] The configuration of the eaves ventilation structure 55 according to this second embodiment is basically the same as that of the first embodiment, and since the ventilation device 1 used here is the same as the ventilation device 1 of the first embodiment, the differences will be mainly described here.

[0070] Referring to FIG. 7, the single - slope roof 59 in this second embodiment has a 3 - inch gradient. The inclination angle θ3 of this 3 - inch - gradient single - slope roof 59 with respect to the horizontal direction is about 17°. The ventilation device 1 is installed by the same process as in the first embodiment, and the eaves ventilation structure 55 is constructed. The inclination angle θ1 of the inclined portion 14 (ventilation space forming portion 54) of the ventilation device 1 with respect to the horizontal direction is about 33° as described in the first embodiment. Therefore, in the eaves ventilation structure 55, the inclination angle θ1 of the inclined portion 14 (ventilation space forming portion 54) with respect to the horizontal direction is larger than the inclination angle θ3 (about 17°) of the single - slope roof 59 with respect to the horizontal direction. As a result, the height - direction distance between the lower surface of the field board 52 and the inclined portion 14 (ventilation space forming portion 54) from the outdoor side to the indoor side becomes longer (L2 < L3), so that it can be suitably used even when the roof gradient is large and is suitable for roofs with various gradients.

[0071] FIG. 8 is a cross - sectional view of a ventilation device corresponding to FIG. 2 according to the third to sixth embodiments of the present invention, where (1) is a figure related to the third embodiment, (2) is a figure related to the fourth embodiment, (3) is a figure related to the fifth embodiment, and (4) is a figure related to the sixth embodiment.

[0072] Since the basic configurations of the ventilation devices in these third to sixth embodiments are the same as those of the first embodiment, the differences will be mainly described here.

[0073] Referring to Figure 8(1), the ventilation device 71 in this third embodiment has a larger inclination angle θ4 of the inclined portion 74 (ventilation space forming portion 75) of the frame member 72 with respect to the horizontal direction than in the first embodiment. In this embodiment, the inclination angle θ4 is configured to be approximately 40°.

[0074] This method makes it possible to apply the technique to steeper roofs, such as those with an 8-inch slope.

[0075] Next, referring to Figure 8(2), the ventilation device 81 in this fourth embodiment has a smaller inclination angle θ5 of the inclined portion 84 (ventilation space forming portion 85) of the frame member 82 with respect to the horizontal direction than in the first embodiment. In this embodiment, the inclination angle θ5 is configured to be approximately 11°.

[0076] This approach makes it possible to apply the system to roofs with gentle slopes, such as a 2-inch slope, making it easier to apply to roofs with various slopes.

[0077] Furthermore, referring to Figure 8(3), the ventilation device 91 in this fifth embodiment is provided with an outer piece 96 that extends horizontally from the bottom surface 95 of the frame member 92, folds upward, and is connected to the lower end of the first wall surface 94.

[0078] In this way, the outer piece 96 acts as a water barrier, preventing rainwater from seeping in from below, thus improving waterproofing performance.

[0079] Furthermore, referring to Figure 8(4), in this sixth embodiment, the ventilation device 101 has a projection 106 provided at the upper end of the first wall portion 104 of the frame member 102 that extends to the indoor side rather than the outdoor side.

[0080] This eliminates any portion of the first wall section 104 that protrudes to the outside, making it easier to construct a soffit ventilation structure with a gable where, for example, the gable base material is in contact with the outside surface of the first wall section 104. Furthermore, the protruding portion 106 extends above the ventilation member 103, providing a retaining effect for the ventilation member 103. In addition, providing a waterproofing material on the upper surface of the protruding portion 106 improves waterproofing performance.

[0081] Figure 9 is a partial cross-sectional view of a ventilation device according to the seventh to ninth embodiments of the present invention, where (1) is a diagram relating to the seventh embodiment, (2) is a diagram relating to the eighth embodiment, and (3) is a diagram relating to the ninth embodiment.

[0082] Since the basic configuration of the ventilation system in these seventh to ninth embodiments is the same as in the first embodiment, the differences will be explained here.

[0083] Referring to Figure 9(1), in this seventh embodiment, the ventilation device 111 has the lower ventilation passage forming portion 121, the intermediate ventilation passage forming portion 122, and the upper ventilation passage forming portion 123 of the ventilation member 113 arranged symmetrically to those of the first embodiment. Specifically, the frame member 112 has a downward ventilation passage forming section 121 that extends horizontally from the first wall surface section 114 toward the second wall surface section 116 at a position separated upward from the bottom surface section 115, an upward ventilation passage forming section 123 that extends diagonally downward from the first wall surface section 114 toward the second wall surface section 116 at a position separated upward from the downward ventilation passage forming section 121, and an intermediate ventilation passage forming section 22 that extends diagonally between the downward ventilation passage forming section 121 and the upward ventilation passage forming section 123, connecting to the first wall surface section 114 side end of the downward ventilation passage forming section 121 and the second wall surface section 116 side end of the upward ventilation passage forming section 123, respectively.

[0084] In the lower ventilation passage forming section 21, a lower ventilation opening 124 is provided that allows air to ventilate in the vertical direction. This opening is formed when the lower ventilation passage forming section 121 extends horizontally from the inner surface of the first wall surface section 114 toward the second wall surface section 116 at intervals, starting from the inner surface of the first wall surface section 114. In the intermediate ventilation passage forming section 122, an intermediate ventilation opening 125 is provided that allows air to ventilate in the vertical direction, consisting of multiple rectangular openings, toward the first wall surface section 114, from the midpoint of the intermediate ventilation passage forming section 122, as indicated by the dashed line C2 in the vertical direction. In the upper ventilation passage forming section 123, an upper ventilation opening 126 is provided that allows air to ventilate in the vertical direction, consisting of multiple rectangular openings, toward the second wall surface section 116, as indicated by the dashed line C2 in the vertical direction.

[0085] In this way, each time air passes through the upper vent 126, the intermediate vent 125, and the lower vent 124, the airflow is disturbed, making it difficult for rainwater to penetrate, thus improving the waterproof performance of the ventilation device 111.

[0086] Next, referring to Figure 9(2), in this eighth embodiment, the ventilation device 131 is such that the lower ventilation passage forming portion 141, the intermediate ventilation passage forming portion 142, and the upper ventilation passage forming portion 143 of the ventilation member 133 are each independently connected to the first wall portion 134 and the second wall portion 136 of the frame member 132. Specifically, the frame member 132 has a downward ventilation passage forming section 141 that extends horizontally from the second wall surface 136 toward the first wall surface 134 at a position separated upward from the bottom surface 135, an intermediate ventilation passage forming section 142 that extends diagonally upward from the second wall surface 136 toward the first wall surface 134 at a position separated upward from the downward ventilation passage forming section 141, and an upward ventilation passage forming section 143 that extends diagonally upward from the first wall surface 134 toward the second wall surface 136 at a position separated upward from the intermediate ventilation passage forming section 142.

[0087] In the lower ventilation passage forming section 21, a lower ventilation opening 144 is provided that allows air to ventilate in the vertical direction. This opening is formed when the lower ventilation passage forming section 141 extends horizontally from the inner surface of the second wall surface section 136 towards the first wall surface section 134 at intervals, starting from the inner surface of the second wall surface section 136, on the side of the first wall surface section 134, as indicated by the dashed-dotted line C3 in a vertical view. In the intermediate ventilation passage forming section 142, an intermediate ventilation opening 145 is provided that allows air to ventilate in the vertical direction, consisting of multiple rectangular openings, on the side of the second wall surface section 136, as indicated by the dashed-dotted line C3 in a vertical view. In the upper ventilation passage forming section 143, an upper ventilation opening 146 is provided that allows air to ventilate in the vertical direction, consisting of multiple rectangular openings, on the side of the first wall surface section 134 of the upper ventilation passage forming section 143, as indicated by the dashed-dotted line C3 in a vertical view.

[0088] In this way, the airflow is disturbed each time air passes through the upper vent 146, the intermediate vent 145, and the lower vent 144, making it difficult for rainwater to penetrate, thus improving the waterproof performance of the ventilation device 131.

[0089] Furthermore, referring to Figure 9(3), the ventilation device 151 in this ninth embodiment has the lower ventilation passage forming portion 161, intermediate ventilation passage forming portion 162, and upper ventilation passage forming portion 163 of the ventilation member 153 provided symmetrically to those of the eighth embodiment. Specifically, it has a lower ventilation passage forming portion 161 that extends horizontally from the first wall portion 154 toward the second wall portion 156 at a position separated above the bottom portion 155 of the frame member 152, an intermediate ventilation passage forming portion 162 that extends diagonally upward from the first wall portion 154 toward the second wall portion 156 at a position separated above the lower ventilation passage forming portion 161, and an upper ventilation passage forming portion 163 that extends diagonally upward from the second wall portion 156 toward the first wall portion 154 at a position separated above the intermediate ventilation passage forming portion 162.

[0090] In the lower ventilation passage forming section 21, a lower ventilation opening 164 is provided that allows air to ventilate in the vertical direction. This opening is formed when the lower ventilation passage forming section 161 extends horizontally from the inner surface of the first wall surface section 154 toward the second wall surface section 156, with a gap between them, in a vertical view, from the midpoint of the lower ventilation passage forming section 161 indicated by the dashed-dotted line C4. In the intermediate ventilation passage forming section 162, an intermediate ventilation opening 165 is provided that allows air to ventilate in the vertical direction, consisting of multiple rectangular openings, toward the first wall surface section 154, in a vertical view, from the midpoint of the intermediate ventilation passage forming section 162 indicated by the dashed-dotted line C4. In the upper ventilation passage forming section 163, an upper ventilation opening 166 is provided that allows air to ventilate in the vertical direction, consisting of multiple rectangular openings, toward the second wall surface section 156, in a vertical view, from the midpoint of the upper ventilation passage forming section 163 indicated by the dashed-dotted line C4.

[0091] In this way, the airflow is disturbed each time air passes through the upper vent 166, the intermediate vent 165, and the lower vent 164, making it difficult for rainwater to penetrate, thus improving the waterproof performance of the ventilation device 151.

[0092] Figure 10 is a partial cross-sectional view of a ventilation device according to the 10th to 13th embodiments of the present invention, where (1) is a diagram relating to the 10th embodiment, (2) is a diagram relating to the 11th embodiment, (3) is a diagram relating to the 12th embodiment, and (4) is a diagram relating to the 13th embodiment.

[0093] Since the basic configuration of the ventilation system in these tenth to thirteenth embodiments is the same as in the first embodiment, the differences will be explained here.

[0094] Referring to Figure 10(1), the ventilation device 171 in this tenth embodiment has a ventilation member 173 which has a first inclined portion 181 that extends downward from the first wall portion 174 of the frame member 172 toward the second wall portion 176, and a second inclined portion 182 that is connected to the end of the first inclined portion 181 toward the first wall portion 174 and extends upward toward the second wall portion 176. The connection portion of the first inclined portion 181 and the second inclined portion 182 is in contact with the inner surface of the first wall portion 174. The connection portions of the first inclined portion 181 and the second inclined portion 182 and the first wall portion 174 and the second wall portion 176 are fixed by welding or the like. The first inclined portion 181 is provided with a first hole 184 consisting of multiple rectangular openings that allow for vertical ventilation, located on the side of the second wall portion 176 from the midpoint of the first inclined portion 181 indicated by the dashed-dotted line C5 when viewed in the vertical direction. The second inclined portion 182 is provided with a second hole 185 consisting of multiple rectangular openings that allow for vertical ventilation, located on the side of the first wall portion 174 from the midpoint of the second inclined portion 182 indicated by the dashed-dotted line C5 when viewed in the vertical direction.

[0095] As a result, the first inclined section 181 and the second inclined section 182 are inclined in different directions, causing the inclination directions of the first hole 184 and the second hole 185 to be opposite. This significantly disrupts the airflow each time air passes through the first hole 184 and the second hole 185, making it difficult for rainwater to penetrate, thus improving the waterproof performance of the ventilation device 171.

[0096] Next, referring to Figure 10(2), the ventilation device 191 in this eleventh embodiment is such that the first inclined portion 201 and the second inclined portion 202 of the ventilation member 193 are provided symmetrically to those of the tenth embodiment. Specifically, the ventilation device 191 has a ventilation member 193 which has a first inclined portion 201 that extends downward from the second wall surface portion 196 of the frame member 192 toward the first wall surface portion 194, and a second inclined portion 202 that is connected to the end of the first inclined portion 201 toward the second wall surface portion 196 and extends upward toward the first wall surface portion 194. The first inclined portion 201 is provided with a first hole 204 consisting of a plurality of rectangular openings that allow air to ventilate in the vertical direction, located toward the first wall surface portion 194 side of the midpoint of the first inclined portion 201 shown by the dashed line C6 in a vertical view. Furthermore, the second inclined portion 202 is provided with a second hole 205 consisting of multiple rectangular openings that allow for vertical ventilation, located on the side of the second wall portion 196 that is closer to the midpoint of the second inclined portion 202 indicated by the dashed line C6 when viewed in the vertical direction.

[0097] As a result, the first inclined section 201 and the second inclined section 202 are inclined in different directions, causing the inclination directions of the first hole 204 and the second hole 205 to be opposite. This significantly disrupts the airflow each time air passes through the first hole 204 and the second hole 205, making it difficult for rainwater to penetrate, thus improving the waterproof performance of the ventilation device 191.

[0098] Furthermore, referring to Figure 10(3), the ventilation device 211 in this twelfth embodiment is a ventilation member 213 that is attached to the space between the first wall portion 214 and the second wall portion 216 of the frame member 212, and is a combination of a first ventilation component 221 that has a rod shape extending in the longitudinal direction and is capable of ventilation in the vertical direction, a second ventilation component 222, and a third ventilation component 223 that are stacked from bottom to top.

[0099] The first ventilation component 221 has a roughly inverted U-shape in its indoor / outdoor cross-section, and multiple first ventilation holes 227 are formed at predetermined intervals along its longitudinal direction on its upper surface 224 by cutting inward (downward) from the first ventilation component 221. Similarly, the second ventilation component 222 has a roughly inverted U-shape in its indoor / outdoor cross-section, and multiple second ventilation holes 228 are formed at predetermined intervals along its longitudinal direction on its upper surface 225 by cutting inward (downward) from the second ventilation component 222. Furthermore, the third ventilation component 223 has a roughly inverted J-shape in its indoor / outdoor cross-section, and multiple third ventilation holes 229 are formed at predetermined intervals along its longitudinal direction on its upper surface 226 by cutting inward (downward) from the third ventilation component 223.

[0100] In this way, the waterproof performance is improved because the first ventilation hole 227, the second ventilation hole 228, and the third ventilation hole 229 are each cut out and raised. Furthermore, since the first ventilation hole 227, the second ventilation hole 228, and the third ventilation hole 229 are arranged to be separated in order from the bottom surface 215 upwards, airflow can move more easily in a straight line vertically, improving ventilation performance.

[0101] Furthermore, referring to Figure 10(4), the ventilation device 231 in this thirteenth embodiment has a ventilation member 233 that is attached to the space between the first wall portion 234 and the second wall portion 236 of the frame member 232, has a rod shape extending in the longitudinal direction, and is made up of multiple layers of synthetic resin sheets having an uneven cross-sectional shape, which are connected to each other by heat fusion and integrated, and has multiple ventilation passages that penetrate in the vertical direction.

[0102] By doing this, air flows through multiple ventilation channels, making it more difficult for rainwater to enter from the entrance of the ventilation channels, thus improving waterproofing performance.

[0103] Although the explanation of the soffit ventilation structure using each of the ventilation devices in the third to twelfth embodiments described above has been omitted, it is possible to construct a soffit ventilation structure as described in the first or second embodiment using each of the ventilation devices in the third to twelfth embodiments. In this way, air can be reliably passed through the ventilation space, thereby improving the ventilation performance.

[0104] Furthermore, although the ventilation system in each of the above embodiments was constructed in a soffit ventilation structure without a gable, it may also be used in a soffit ventilation structure with a gable.

[0105] Furthermore, in each of the embodiments described above, the ventilation device was installed on the eaves on the upstream side of the single-slope roof, but it may also be installed in other parts of the house.

[0106] Furthermore, in each of the above embodiments, the frame members were formed by press-forming steel plates, but they may also be formed by press-forming other metal plates, or from other materials. They may also be formed by other methods such as casting.

[0107] Furthermore, while the ventilation members in the above embodiments had specific shapes, they are not limited to these. Any other structure is acceptable as long as it allows for ventilation in the vertical direction.

[0108] Furthermore, in the first to twelfth embodiments described above, the ventilation members were formed by press-forming steel plates, but they may also be formed by press-forming other metal plates, or from other materials. They may also be formed by other methods such as casting.

[0109] Furthermore, in the 13th embodiment described above, the ventilation member was formed by laminating multiple synthetic resin sheets, but it may be formed from other materials.

[0110] Furthermore, in each of the above embodiments, the plate thickness and dimensions of the frame member and ventilation member are not particularly limited and can be appropriately changed according to the installation location.

[0111] Furthermore, in each of the embodiments described above, the inclined portion (ventilation space forming portion) was inclined at a specific angle with respect to the horizontal direction, but it can be appropriately changed according to the slope of the single-slope roof, as long as it can form a ventilation space between itself and the roof sheathing.

[0112] Furthermore, although the above embodiments included protruding parts, these protruding parts are not required.

[0113] Furthermore, although the first to fifth and seventh to thirteenth embodiments described above included a water-sealing material, the water-sealing material is not required.

[0114] Furthermore, in each of the embodiments described above, the openings in the frame members were formed with a specific shape and at specific intervals, but they may be formed with other shapes, sizes, or intervals. For example, they may be formed as cut-and-bent sections, or they may be arranged at equal intervals from one end to the other in the longitudinal direction.

[0115] Furthermore, although a folded portion is provided at the lower end of the third wall surface in each of the above embodiments, the folded portion may be omitted.

[0116] Furthermore, in the first to ninth embodiments described above, the downward ventilation passage forming portion extended horizontally, but it may also be inclined upward or downward.

[0117] Furthermore, in the first to ninth embodiments described above, the intermediate ventilation passage forming portion extended inclined, but it may also extend horizontally.

[0118] Furthermore, in the first to ninth embodiments described above, the upper ventilation passage forming portion extended inclined, but it may also extend horizontally.

[0119] Furthermore, in the first to ninth embodiments described above, the lower vents were formed by extending the lower vent passage forming portion with a gap between it and the first or second wall surface, but they may be formed in other shapes or sizes. For example, they may be openings such as intermediate vents or upper vents, or cut-out holes may be formed.

[0120] Furthermore, in the first to ninth embodiments described above, the intermediate vents and upper vents were rectangular openings, but they may be formed in other shapes or sizes. For example, they may be circular openings, or cut-out holes may be formed.

[0121] Furthermore, in the first to seventh embodiments described above, the intermediate ventilation passage forming section was connected to the respective ends of the lower ventilation passage forming section and the upper ventilation passage forming section. However, it is not limited to this configuration, and may also be connected to the upper surface of the lower ventilation passage forming section and the lower surface of the upper ventilation passage forming section.

[0122] Furthermore, in the 10th and 11th embodiments described above, the first inclined portion and the second inclined portion were connected at their respective ends, but the first inclined portion may be connected to the lower surface of the second inclined portion.

[0123] Furthermore, in the tenth and eleventh embodiments described above, the first and second holes were rectangular openings, but they may be formed in other shapes or sizes. For example, they may be circular openings, or cut-out holes may be formed.

[0124] Furthermore, in the fifth embodiment described above, the outer piece extended horizontally, but it is not limited to this and may be formed to extend downward. Specifically, it may be formed to extend vertically downward from the bottom surface, then fold back upward towards the outdoor side and connect to the lower end of the first wall surface. In this way, the outer piece functions as a drain.

[0125] Furthermore, although the mounting portion had a specific shape in each of the above embodiments, it may have a different shape and can be appropriately modified to match the shape of the frame member.

[0126] Furthermore, although mounting portions were provided in the first and second embodiments described above, mounting portions are not required. In that case, the indoor end of the upper ventilation passage forming portion will be connected to the second wall surface.

[0127] Furthermore, in the first and second embodiments described above, the frame member and the ventilation member were attached by double-sided tape or adhesive, but other methods may be used. For example, they may be attached by welding.

[0128] Furthermore, in the first and second embodiments described above, the frame member and the ventilation member were combined from separate components, but the invention is not limited to this, and they may be formed integrally from the beginning.

[0129] Furthermore, in the third to thirteenth embodiments described above, the method of attaching the frame member and the ventilation member is not particularly limited; however, any appropriate method such as attachment by double-sided tape or adhesive, or welding, may be used. Also, the frame member and the ventilation member may be formed integrally from the beginning. [Explanation of Symbols]

[0130] 1, 71, 81, 91, 101, 111, 131, 151, 171, 191, 211, 231… Ventilation devices 5, 55... Eaves ventilation structure 10, 72, 82, 92, 102, 112, 132, 152, 172, 192, 212, 232… Frame members 11, 94, 104, 114, 134, 154, 174, 194, 214, 234... First wall section 12, 95, 115, 135, 155, 215,...bottom part 13, 116, 136, 156, 176, 196, 216, 236... Second wall section 14, 74, 84...Slope part 15…Third wall section 16, 106...Protrusion 17…Waterproofing material 18...Aperture 20, 103, 113, 133, 153, 173, 193, 213, 233… Ventilation components 21, 121, 141, 161... Lower ventilation passage forming section 22, 122, 142, 162... Intermediate ventilation passage forming section 23, 123, 143, 163... Upper ventilation passage forming section 24, 124, 144, 164... downward vents 25, 125, 145, 165... intermediate vents 26, 126, 146, 166... ​​Upper vents 27…Mounting part 34, 54, 75, 85... Ventilation space forming section 36…Ventilated space 43…Exterior wall material 45, 52...Noji board 48... Arabesque 49, 59... Single-slope roof In each figure, the same reference numeral indicates the same or corresponding part.

Claims

1. A soffit ventilation structure installed in the area between the exterior wall material and the decorative trim on the upstream side of a single-slope roof, A frame member having: a first wall surface extending vertically below the roof decking of the single-slope roof; a bottom surface connected to the lower end of the first wall surface and extending horizontally toward the interior, with a plurality of openings formed at predetermined intervals in the longitudinal direction; a second wall surface connected to the interior end of the bottom surface and extending upward to the height of an intermediate position of the first wall surface at a position separated from the first wall surface toward the interior; and a ventilation space forming portion connected to the upper end of the second wall surface and extending so as to incline downward toward the interior, forming a ventilation space between itself and the roof decking, A soffit ventilation structure comprising a ventilation member disposed between the inner surface of the first wall portion and the inner surface of the second wall portion, extending in the longitudinal direction and having a ventilation function in the vertical direction.

2. The soffit ventilation structure according to claim 1, wherein the ventilation space forming portion is configured to have the same angle of inclination as the angle of inclination of the single-slope roof with respect to the horizontal direction.

3. The soffit ventilation structure according to claim 1, wherein the ventilation space forming portion is configured to have a large angle of inclination with respect to the angle of inclination of the single-slope roof with respect to the horizontal direction.

4. The soffit ventilation structure according to claim 1, wherein a projection is provided on the upper end side of the first wall surface that protrudes horizontally toward the outdoors.

5. The soffit ventilation structure according to claim 4, wherein the protruding portion is provided with a water-stopping material on its upper surface that contacts the lower surface of the roof sheathing.

6. The soffit ventilation structure according to claim 1, wherein the frame member has a third wall portion that is connected to the indoor end of the ventilation space forming portion and extends vertically along the indoor side of the exterior wall material at a position separated from the second wall portion toward the indoor side.

7. The ventilation member has a lower ventilation passage forming portion and an upper ventilation passage forming portion that extend from the first wall portion toward the second wall portion at positions separated vertically above the bottom portion and form a ventilation passage, and an intermediate ventilation passage forming portion that connects to the lower ventilation passage forming portion and the upper ventilation passage forming portion, respectively, between the lower ventilation passage forming portion and the upper ventilation passage forming portion. The soffit ventilation structure according to claim 1, wherein the lower ventilation passage forming section is provided with a lower ventilation opening that allows air to ventilate in the vertical direction on the first wall surface side of the midpoint of the lower ventilation passage forming section when viewed in the vertical direction, the intermediate ventilation passage forming section is provided with an intermediate ventilation opening that allows air to ventilate in the vertical direction on the second wall surface side of the midpoint of the intermediate ventilation passage forming section when viewed in the vertical direction, and the upper ventilation passage forming section is provided with an upper ventilation opening that allows air to ventilate in the vertical direction on the first wall surface side of the midpoint of the upper ventilation passage forming section when viewed in the vertical direction.

8. A ventilation device used for natural ventilation of a house via the eaves on the uphill side of a single-slope roof, A frame member having a first wall portion and a second wall portion that face each other and extend in the vertical direction, a bottom portion connected to the lower end side of each of the first wall portion and the second wall portion and having a plurality of openings formed at predetermined intervals in the longitudinal direction, and an inclined portion connected to the upper end side of one of the first wall portion and the second wall portion and extending inclined downward at an angle, A ventilation device comprising a ventilation member disposed between the inner surface of the first wall portion and the inner surface of the second wall portion, extending in the longitudinal direction and having a ventilation function in the vertical direction.

9. The ventilation device according to claim 8, wherein a projection is provided on the upper end side of the first wall surface that protrudes horizontally toward the outdoors.

10. The ventilation device according to claim 9, wherein the protruding portion is provided with a water-stopping material on its upper surface that contacts the lower surface of the single-slope roof.

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