Ventilation structure

Abstract

To provide a ventilation structure with high waterproof performance. [Solution] The ventilation structure 1 comprises a main body member installed on the roof and a cover member positioned above the main body member. The main body member comprises a first barrier portion projecting in a mountain shape, a lower plate portion extending toward the waterward side from the waterward end of the first barrier portion, a fixing portion abutting against the upper surface of the lower plate portion, a first support portion abutting against the lower surface of the cover member downstream of the fixing portion, a second support portion abutting against the lower surface of the cover member upstream of the fixing portion, a second barrier portion connecting the first support portion and the fixing portion and having a first opening formed thereon, a third barrier portion connecting the second support portion and the fixing portion and having a second opening formed thereon, a fourth barrier portion extending from the waterward end of the second support portion to the lower plate portion and having a third opening formed thereon, a fifth barrier portion extending upward from the waterward end of the lower plate portion upstream of the fourth barrier portion, and a sixth barrier portion extending downward from the lower surface of the cover member upstream of the fifth barrier portion.

Description

Technical Field

[0001] This invention relates to a ventilation structure, and particularly to a ventilation structure installed on the water portion of a roof.

Background Art

[0002] As a ventilation structure installed on the water portion of a roof, there is one shown in Patent Document 1.

[0003] FIG. 12 is an enlarged cross-sectional view showing the construction state of a conventional ventilation structure disclosed in Patent Document 1.

[0004] Referring to FIG. 12, the ventilation structure 121 is installed at the mating portion composed of the outer wall 46 of the main house and the roof portion 60 of the lower house where a ventilation opening 48 is formed in the water portion. The ventilation structure 121 is composed of a pair of long members 122 and 123 combined vertically and an intermediate member 124 installed between the long members.

[0005] The upper long member 122 is composed of a plate-shaped inclined portion extending obliquely downward from its apex in the width direction (right direction in the figure), a rising portion extending vertically upward from the apex of the inclined portion, and a vertical wall 131 connected to the lower end portion of the inclined portion and extending downward. Note that an opening hole is formed at the lower end of the vertical wall.

[0006] The intermediate member 124 installed below the upper long member 122 is formed in a plate shape with an uneven cross-section in the width direction, and opening holes are formed at different upper and lower positions in each of the two vertical walls 132 and 133. Therefore, from one end portion to the other end portion in the width direction of the intermediate member 124, it is in a communicating state by a passage that meanders up and down.

[0007] The lower elongated member 123, installed below the intermediate member 124, consists of an inclined section that is approximately parallel to the inclined section of the upper elongated member 122, an inclined wall connected to the upper end of the inclined section and extending upward, a vertical wall connected to the lower end of the inclined section and extending upward, located outward from the vertical wall 131 of the upper elongated member 122, and a windbreak plate connected to the upper end of the vertical wall and extending diagonally downward.

[0008] In the ventilation structure 121 configured in this way, when in a ventilated state, as shown by arrow X in Figure 12, air discharged from the attic of the lower roof passes through the intermediate member via a ventilation opening formed in the upper part of the roofing material and is discharged to the outside through the vertical walls of the elongated members. On the other hand, rainwater that penetrates through the vertical walls 131, 132, 133, and 134 of the elongated members 122 and 123 is blocked by the uneven intermediate member 124 and also blocked by the inclined wall 135 of the lower elongated member 123. In this way, the conventional ventilation structure 121 is configured to exhibit both ventilation performance and waterproofing performance. [Prior art documents] [Patent Documents]

[0009] [Patent Document 1] Japanese Patent Publication No. 2006-063725 [Overview of the project] [Problems that the invention aims to solve]

[0010] However, in conventional ventilation structures like the one described above, rainwater intrusion is prevented by the inclined walls of the intermediate members and the long, lower members, but there was room for improvement in waterproofing performance when rainwater is blown in with strong winds.

[0011] This invention was made to solve the above-mentioned problems and aims to provide a ventilation structure with high waterproof performance. [Means for solving the problem]

[0012] To achieve the above objective, the invention described in claim 1 is a ventilation structure installed to cover a ventilation opening formed in the upstream portion of a sloping roof, comprising: a main body member installed at the downstream position of the ventilation opening; and a cover member positioned above the main body member to cover the ventilation opening and having an overhang at its downstream end, wherein the main body member has a first barrier portion projecting in a mountain shape downstream of the overhang, a lower plate portion extending upstream from the upstream end of the first barrier portion, a fixing portion that abuts against the upper surface of the lower plate portion and is attached to the roof, and a cover portion downstream of the fixing portion The structure comprises a first support portion that abuts the lower surface of the material, a second support portion that abuts the lower surface of the cover member on the upstream side of the fixing portion, a second barrier portion that connects the first support portion and the fixing portion and has a first opening formed thereon, a third barrier portion that connects the second support portion and the fixing portion and has a second opening formed thereon, a fourth barrier portion that extends from the upstream end of the second support portion to the lower plate portion and has a third opening formed thereon, a fifth barrier portion that extends upward from the upstream end of the lower plate portion on the upstream side of the fourth barrier portion, and a sixth barrier portion that extends downward from the lower surface of the cover member on the upstream side of the fifth barrier portion.

[0013] With this configuration, the first barrier prevents rainwater from entering, while the eaves, second barrier, third barrier, fourth barrier, fifth barrier, and sixth barrier cause the air attempting to enter the building to meander, making it difficult for rainwater to penetrate.

[0014] The invention described in claim 2 is the configuration of the invention described in claim 1, wherein the main body member further comprises a third support portion which abuts against the lower surface of the cover member on the waterward side of the second support portion, and whose waterward end is connected to the upper end of the sixth barrier portion and whose waterward end is connected to the upper end of the fifth barrier portion, and the fifth barrier portion connects the third support portion and the lower plate portion, forming a fourth opening.

[0015] With this configuration, the fifth barrier disperses the pressure coming from above the cover member.

[0016] The invention described in claim 3 is the configuration of the invention described in claim 1, wherein the main body member further comprises a third support portion whose upstream end is connected to the upper end of the sixth barrier portion and which abuts against the lower surface of the cover member on the upstream side of the second support portion, the third support portion includes a water-sealing material attached to the upper surface of the downstream end, and the downstream end of the third support portion and the water-sealing material are arranged between the lower surface of the cover member and the second support portion.

[0017] With this configuration, the water-sealing material comes into contact with the lower surface of the cover member, closing the gap between the third support part and the cover member.

[0018] The invention described in claim 4 is the configuration of the invention described in any one of claims 1 to 3, further comprising a drip edge member installed below the main body member, wherein the drip edge member comprises a first plate portion fixed to the roof portion below the lower plate portion, and a second plate portion extending from the upstream end of the first plate portion toward the cover member, the upper end of the second plate portion being positioned higher than the lower end of the sixth barrier portion.

[0019] With this configuration, some of the rainwater attempting to enter the building will collide with the second plate.

[0020] The invention described in claim 5 is the configuration of the invention described in claim 4, wherein the second barrier portion, third barrier portion, fourth barrier portion, fifth barrier portion and sixth barrier portion are arranged in a parallel state, and the distance between the fifth barrier portion and the sixth barrier portion is set to be smaller than the distance between the third barrier portion and the fourth barrier portion.

[0021] With this configuration, wind and rain attempting to penetrate the building on the water side meander more dramatically, making it more difficult for rainwater to enter.

[0022] The invention described in claim 6 is, 2 In the configuration of the invention described, the fourth opening is formed on the upper part of the fifth barrier portion, and the sixth barrier portion extends to a position parallel to the lower part of the fifth barrier portion.

[0023] With this configuration, part of the rainwater attempting to enter the room from the fourth opening collides with the sixth barrier portion and heads downward.

[0024] The invention according to claim 7 is based on the configuration of the invention according to claim 4, wherein the roof portion includes a wooden base installed on the lower side of the ventilation opening under water, and a roofing material installed on the lower side of the wooden base under water. The second plate portion of the water drainage member is disposed between the wooden base and the ventilation opening to partition a ventilation path between the second plate portion and the outer wall base material. The fixing portion and the first plate portion are attached to the wooden base by a fixture.

[0025] With this configuration, the roofing material is not damaged by the fixture. Also, it is possible to partition the ventilation path while preventing the intrusion of rainwater by the water drainage member.

Advantages of the Invention

[0026] As described above, the invention according to claim 1 prevents the intrusion of rainwater by the first barrier portion, and the air attempting to enter the room by the eaves portion, the second barrier portion, the third barrier portion, the fourth barrier portion, the fifth barrier portion, and the sixth barrier portion meanders, making it difficult for rainwater to intrude, thus improving the waterproof performance.

[0027] The invention according to claim 2, in addition to the effect of the invention according to claim 1, the pressure from above the cover member is dispersed by the fifth barrier portion, so the mounting state of the ventilation structure is stabilized.

[0028] The invention according to claim 3, in addition to the effect of the invention according to claim 1, the water stop material abuts against the lower surface of the cover member to close the gap between the third support portion and the cover member, so the waterproof performance is further improved.

[0029] The invention according to claim 4, in addition to the effect of the invention according to any one of claims 1 to 3, part of the rainwater attempting to enter the room collides with the second plate portion, making it more difficult for rainwater to intrude.

[0030] In addition to the effects of the invention described in claim 4, the invention described in claim 5 further improves waterproofing performance because, on the water side, wind and rain attempting to penetrate the building meander more significantly, making it more difficult for rainwater to penetrate.

[0031] The invention described in claim 6 is, 2 In addition to the effects of the invention described above, some of the rainwater attempting to enter the building through the fourth opening collides with the sixth barrier and is directed downwards, making it even more difficult for rainwater to penetrate.

[0032] The invention described in claim 7, in addition to the effects of the invention described in claim 4, can prevent water leakage from the roofing material because the roofing material is not damaged by the fasteners. Furthermore, because the drainage member can partition the ventilation passage while preventing rainwater from entering, waterproofing performance in accordance with the design intent can be achieved regardless of the type or shape of the roofing material. [Brief explanation of the drawing]

[0033] [Figure 1] This is a plan view showing the external shape of a ventilation structure according to the first embodiment of this invention. [Figure 2] This is an enlarged cross-sectional view of the II-II line shown in Figure 1. [Figure 3] This is an enlarged view of section A shown in Figure 2. [Figure 4] Figure 2 is a perspective view showing the external shape of the main body component. [Figure 5] This is a schematic end view showing the first installation process of the ventilation structure shown in Figure 1 to the flashing portion. [Figure 6] This is a schematic end view showing the second installation process of the ventilation structure shown in Figure 1 to the flashing portion. [Figure 7] This is a schematic end view showing the installation of the ventilation structure shown in Figure 1 to the flashing portion. [Figure 8] This is a schematic end view showing the mounting state of the ventilation structure according to the second embodiment of this invention to the rain flashing portion, and corresponds to Figure 7. [Figure 9]Figure 7 is a perspective view showing the external shape of the main body components, where (1) represents the first and second components, and (2) represents the third component. [Figure 10] This is a diagram showing the installation of the ventilation structure according to the third embodiment of this invention when used on a double-slope roof. [Figure 11] This is a diagram showing the installation of the ventilation structure according to the fourth embodiment of this invention when used on a single-slope roof. [Figure 12] This is an enlarged cross-sectional view showing the construction state of a conventional ventilation structure disclosed in Patent Document 1. [Modes for carrying out the invention]

[0034] Figure 2 is a plan view showing the external shape of a ventilation structure according to the first embodiment of this invention, and Figure 2 is an enlarged cross-sectional view of the line II-II shown in Figure 1.

[0035] Referring to Figures 1 and 2, the ventilation structure 1 mainly consists of a main body member 2 formed by pressing steel plates and a cover member 3 formed by pressing steel plates and installed to cover the main body member 2. The ventilation structure 1 is installed to cover a ventilation opening formed in the upper part of the sloping roof section, which will be described later. In this embodiment, the ventilation structure 1 is installed in the flashing section formed by the outer wall of the main building and the roofing material of the lower roof.

[0036] Figure 3 is an enlarged view of section A shown in Figure 2, and Figure 4 is a perspective view showing the external shape of the main body component shown in Figure 2.

[0037] Referring together to Figures 3 and 4, the main body member 2 consists of a first member 10 positioned on the roof and a second member 20 that is placed on the first member 10 and positioned below the cover member 3.

[0038] The first member 10 comprises a first barrier portion 11 that protrudes in a mountain shape on the downstream side, a lower plate portion 12 extending upstream from the upstream end of the first barrier portion 11, a fifth barrier portion 13 extending upward from the upstream end of the lower plate portion 12, a third support portion 14 extending upstream from the upper end of the fifth barrier portion 13 and contacting the lower surface of the cover member 3, and a sixth barrier portion 15 connected to the upstream end of the third support portion 14 and extending downward from the upstream end (the lower surface of the cover member 3 upstream of the fifth barrier portion 13). With this configuration, the pressure from above the cover member 3 is dispersed by the fifth barrier portion 13 on the upstream side of the first member 10, thus stabilizing the mounting state of the ventilation structure 1.

[0039] The first barrier section 11 includes a rising section 16 extending from the downstream end of the lower plate section 12 to the peak of the mountain shape, and a water-blocking section 17 extending diagonally downward from the peak. Below the rising section 16, a plurality of drainage holes 18 are formed at predetermined intervals. Above the fifth barrier section 13, a plurality of fourth openings 19 are formed at predetermined intervals. The sixth barrier section 15 extends to a position parallel to the lower part of the fifth barrier section 13. The effects of this configuration will be described later.

[0040] The second member 20 includes a fixing portion 21 having a flat surface and having its lower surface abutting against the upper surface of the lower plate portion 12 to attach it to the roof portion, a first support portion 22 having a flat surface and having abutting against the lower surface of the cover member 3 downstream of the fixing portion 21, a second support portion 23 having a flat surface and having its upper surface abutting against the lower surface of the cover member 3 upstream of the fixing portion 21, a flat plate portion 27 having a flat surface and having its lower surface abutting against the upper surface of the lower plate portion 12 downstream of the second support portion 23, a second barrier portion 24 connecting the first support portion 22 and the fixing portion 21, a third barrier portion 25 connecting the second support portion 23 and the fixing portion 21, and a fourth barrier portion 26 extending from the downstream end of the second support portion 23 to the lower plate portion 12 and connecting the second support portion 23 and the flat plate portion 27. A plurality of first openings 28 are formed at predetermined intervals below the second barrier portion 24. Multiple second openings 29 are formed at predetermined intervals above the third barrier portion 25. Multiple third openings 30 are formed at predetermined intervals below the fourth barrier portion 26.

[0041] Thus, the main body member 2 is an integrated unit of the first member 10 and the second member 20. In this embodiment, the main body member 2 was composed of the first member 10 and the second member 20 positioned between the first member 10 and the cover member 3, but it may also be composed of a single member. In other words, the main body member can be applied as the main body member according to the present invention even if it has a different shape, as long as it comprises a fixing part that abuts against the upper surface of the lower plate and is attached to the roof part, a first support part that abuts against the lower surface of the cover member downstream of the fixing part, a second support part that abuts against the lower surface of the cover member upstream of the fixing part, a second barrier part that connects the first support part and the fixing part and has a first opening formed thereon, a third barrier part that connects the second support part and the fixing part and has a second opening formed thereon, a fourth barrier part that extends from the upstream end of the second support part to the lower plate and has a third opening formed thereon, a fifth barrier part that extends upward from the upstream end of the lower plate part upstream of the fourth barrier part, and a sixth barrier part that extends downward from the lower surface of the cover member upstream of the fifth barrier part.

[0042] The second barrier section 24, the third barrier section 25, the fourth barrier section 26, and the fifth barrier section 13 are positioned between the bottom plate section 12 and the cover member 3 so as to traverse the ventilation path from indoors to outdoors, and the first opening 28, the second opening 29, the third opening 30, and the fourth opening 19 are formed in staggered positions. With this configuration, rainwater from the outside collides with the second barrier section 24, the third barrier section 25, the fourth barrier section 26, and the fifth barrier section 13. Meanwhile, air passes through the first opening 28, the second opening 29, the third opening 30, and the fourth opening 19, ensuring a ventilation path from indoors to outdoors.

[0043] In the installed state, the second barrier section 24, the third barrier section 25, the fourth barrier section 25, the fifth barrier section 13, and the sixth barrier section 15 are arranged in parallel, and the distance D1 between the fifth barrier section 13 and the sixth barrier section 15 is set to be smaller than the distance D2 between the third barrier section 25 and the fourth barrier section 25. The effects of this configuration will be described later.

[0044] Furthermore, in the installed state, the first support portion 22, the second support portion 23, the fixing portion 21, and the flat plate portion 27 are arranged parallel to the roof portion (not shown). The angle θ1 between the second barrier portion 24 and the first support portion 22 is set to 90 degrees, the angle θ2 between the third barrier portion 25 and the second support portion 23a is set to 90 degrees, and the angle θ3 between the fourth barrier portion 26 and the second support portion 23 is set to 90 degrees. With this configuration, the second barrier portion 24, the third barrier portion 25, and the fourth barrier portion 26 are arranged perpendicular to the cover member 3 and the roof portion, resulting in a stable shape for the ventilation structure 1. In addition, when the cover member 3 is attached, even if the load of the cover member 3 is applied to the main body member 2, the deflection of the second member 20 is suppressed, and the ventilation path is less likely to collapse.

[0045] The first support portion 22 has a flat surface and includes a projection 31 extending along the lower surface of the cover member 3, and a reinforcing portion 32 that extends upstream along the projection 31, folded downward from the downstream end of the projection 31, with its upper surface in contact with the lower surface of the cover member 3, so as to be doubled. With this configuration, the thickness of the mounting portion between the cover member 3 and the main body member 2 becomes larger than that of other parts. As a result, even if force is applied from the outside (above or from the side) due to strong winds or storms, the mounting portion is less likely to bend, improving the strength of the mounting portion and stabilizing the mounting state of the ventilation structure 1.

[0046] The cover member 3 includes an inclined portion 36 that extends along the slope of the roofing material of the rain-flashing portion when installed, an overhang portion 37 that extends from the downstream end of the inclined portion 36 in the direction of the first member 10 at a predetermined distance, and a vertical portion 38 that extends vertically upward from the upstream end of the inclined portion 36.

[0047] Furthermore, referring to Figure 4, waterproofing materials 61a and 61b made of EPDM are provided at both ends in the longitudinal direction of the ventilation structure 1, waterproofing material 33 made of EPDM is provided on the lower surface of the ventilation structure 1 (lower plate portion 12), and waterproofing material 62 is provided on the upper surface of the second support portion 23. With this configuration, it is possible to prevent rainwater from entering from both ends and from entering as rainwater is blown along the roof surface from the downstream side.

[0048] Next, we will explain how to attach the ventilation structure shown in Figure 1 to the flashing portion.

[0049] Figure 5 is a schematic end view showing the first installation process of the ventilation structure shown in Figure 1 to the flashing portion.

[0050] Referring to Figure 5, the flashing portion 45 consists of the exterior wall 46 of the main building, on which the exterior wall underlayment 50 is installed on its outer surface, and the roof portion 60 of the lean-to roof, which extends diagonally downward outward from the middle of the exterior wall 46, with a rectangular ventilation opening 48 extending in the longitudinal direction formed at its apex. Specifically, the roof portion 60 consists of a roof underlayment 51 installed on the rafters 49 and a roofing material 52 made of metal plate installed on the roof underlayment 51. The roofing material 52 has a raised section 54 formed at the upstream end by a Yachiyo-ori process. The roofing material 52 is installed on the roof underlayment 51 installed on the rafters 49 via roofing felt and underlayment (not shown).

[0051] Above the roof underlayment 51, a flashing member 40 with an L-shaped cross-section in the direction of flow is installed. The flashing member 40 comprises a first plate portion 41 that extends along the slope of the roof portion 60 and is fixed to the roof underlayment 51 of the roof portion 60, and a second plate portion 42 that extends from the upstream end of the first plate portion 41 toward the cover member 3.

[0052] Furthermore, a wooden base 53 is installed above the first plate section 41. In addition, a chemical flashing 55 is installed on the upper surface of the roofing material 52 at the downstream position of the rising processing section 54, and an apron flashing 56 is installed on the upper surface of the roofing material 52 downstream of the chemical flashing 55.

[0053] For installation, first, the lower surface of the lower plate portion 12 is placed on the upper surface of the apron flashing 56, and the main body member 2 is positioned on the wooden base 53 via the apron flashing 56. Then, fasteners 57 such as screws are driven in from above the fixing portion 21 to fix the main body member 2 to the wooden base 53. With this configuration, the roofing material 52 is not damaged by the fasteners 57, thus preventing leakage from the grooves of the roofing material 52.

[0054] Next, the cover member 3 is lowered from above the main body member 2 (first member 10 and second member 20) so as to overlap the second member 20. This causes the lower surface of the inclined portion 36 to contact the upper surfaces of the first support portion 22, the second support portion 23, and the third support portion. The inclined portion 36 of the cover member 3 is then fastened to the upper surface of the first support portion 22 using fasteners 34 such as screws. Furthermore, in the vertical portion 38, fixing nails (not shown) are driven in from the outside towards the exterior wall 46 so as to penetrate the exterior wall substrate 50. In this way, the ventilation structure 1 is fixed to the exterior wall 46 and the roofing material 52.

[0055] When the ventilation structure 1 is installed on the flashing portion 45 in this manner, the state shown in Figure 6 is obtained.

[0056] Figure 6 is a schematic end view showing the second installation process of the ventilation structure shown in Figure 1 to the flashing portion.

[0057] Referring to Figure 6, when the ventilation structure 1 is installed on the flashing portion 45, the upper end 43 of the second plate portion 42 of the flashing member 40 is positioned higher than the lower end 44 of the sixth barrier portion 15 of the ventilation structure 1. In other words, the length of the second plate portion 42 is set such that the vertical height H1 of the upper end 43 of the second plate portion 42 from the ground (or reference point) is longer than the vertical height H2 of the lower end 44 of the sixth barrier portion 15 from the ground (or reference point), and the upper end 43 of the second plate portion 42 of the flashing member 40 is positioned between the lower end 44 of the sixth barrier portion 15 and the inclined portion 36 of the cover member 3. Note that in Figure 6, the top of the roof substrate 51 is used as the reference point. The second plate portion 42 is positioned between the wooden substrate 53 and the ventilation opening 48, thereby defining a ventilation path between the second plate portion 42 and the exterior wall substrate 50. The effects of this configuration will be described later.

[0058] Next, a breathable waterproof sheet (not shown) is attached to the exterior wall substrate 50 and the vertical section 38 so as to cover the upper outer surface of the vertical section 38. This seals the vertical section 38 to the outside of the exterior wall substrate 50. Subsequently, multiple rod-shaped furring strips 58 extending vertically are installed at predetermined intervals in the longitudinal direction (the direction through Figure 5) from the outside of the attached breathable waterproof sheet and the vertical section 38. Then, a plate-shaped exterior wall material 59 is installed from the outside so as to span across the multiple furring strips 58. This results in the installation state shown in Figure 6.

[0059] Figure 7 is a schematic end view showing the installation of the ventilation structure shown in Figure 1 to the flashing portion.

[0060] Referring to Figure 7, as explained in the second installation process, the installation of the breathable waterproof sheet, furring strips 58 and exterior wall material 59 completes the attachment of the ventilation structure 1 to the flashing portion 45.

[0061] In the ventilation structure 1, the main body member 2 is installed at the downstream side of the ventilation opening 48, and the cover member 3 is positioned above the main body member 2 so as to cover the ventilation opening 48. In this way, the ventilation structure 1 is installed so as to cover the ventilation opening 48 formed in the rain flashing portion 45 (the upstream portion of the sloping roof).

[0062] In a ventilated state, as shown by the double arrows in Figure 7, the air inside the building moves outward from the ventilation opening 48 through the first opening 28, second opening 29, third opening 30, and fourth opening 19 below the cover member 3 of the ventilation structure 1. On the other hand, when outside air enters the building, the flow is opposite to that shown by the double arrows in Figure 7.

[0063] On the other hand, rainwater attempts to penetrate into the ventilation structure 1 through the air inlet. In particular, at the flashing portion 45, compared to double-slope roofs or single-slope roofs where some of the wind and rain also flows horizontally, wind and rain directed towards the flashing portion collide with the exterior wall of the main building before flowing onto the roof surface of the lower roof, making it easier for a large amount of rainwater to penetrate, thus requiring higher waterproofing performance. In contrast, in the present invention, the ventilation structure 1 is configured to prevent rainwater from penetrating with the first barrier portion 11, and is also shielded by the eaves portion 37, second barrier portion 24, third barrier portion 25, fourth barrier portion 26, fifth barrier portion 13, and sixth barrier portion 15, preventing penetration to the inside. Furthermore, the air attempting to penetrate the interior is caused to meander by the eaves portion 37, second barrier portion 24, third barrier portion 25, fourth barrier portion 26, fifth barrier portion 13, and sixth barrier portion 15. As a result, with each meander, the force of the rainwater flow decreases compared to the force of the flow before the meander. Furthermore, the force of the water decreases as it passes from the second barrier section 24 to the sixth barrier section 15, making it more difficult for rainwater to penetrate, thus improving waterproofing performance.

[0064] Furthermore, as described above, the second barrier section 24, the third barrier section 25, the fourth barrier section 26, the fifth barrier section 13, and the sixth barrier section 15 are arranged in a parallel state, and the distance between the fifth barrier section 13 and the sixth barrier section 15 is set to be smaller than the distance between the third barrier section 25 and the fourth barrier section 26. As a result, wind and rain attempting to penetrate the building on the water side meander more dramatically, making it more difficult for rainwater to penetrate, thus further improving the waterproofing performance.

[0065] Furthermore, as described above, the upper end 43 of the second plate portion 42 of the water drainage member 40 is positioned higher than the lower end 44 of the sixth barrier portion 15 of the ventilation structure 1. As a result, some of the rainwater attempting to enter the building collides with the second plate portion 42, making it difficult for rainwater to penetrate. The wind and rain that collides with the sixth barrier portion 15 will move downwards, but the second plate portion 42 makes it difficult for the wind and rain to pass over the second plate portion 42 and penetrate into the ventilation opening 48. Therefore, the waterproofing performance is further improved.

[0066] Furthermore, as described above, the fourth opening 19 is formed on the upper part of the fifth barrier section 13, and the sixth barrier section 15 extends to a position parallel to the lower part of the fifth barrier section 13, so that some of the rainwater attempting to enter the interior from the fourth opening 19 collides with the sixth barrier section 15. That is, rainwater attempting to enter the interior from the fourth opening 19 is directed upward, horizontally, and downward, but the rainwater directed upward and horizontally is blocked by the sixth barrier section 15. Also, because the sixth barrier section 15 is set to approximately the same length as the fifth barrier section 13, some of the rainwater directed downward also collides with the sixth barrier section 15. As a result, most of the rainwater attempting to further enter the interior from the fourth opening 19 is directed downward, making it more difficult for rainwater to penetrate further.

[0067] Furthermore, as described above, the second plate portion 42 is positioned between the wooden base 53 and the ventilation opening 48, thereby partitioning the ventilation path between the second plate portion 42 and the exterior wall base material 50. This allows for partitioning the ventilation path while preventing rainwater from entering, thus enabling waterproofing performance in line with the design intent, regardless of the type or shape of the roofing material.

[0068] Figure 8 is a schematic end view showing the mounting state of the ventilation structure according to the second embodiment of this invention to the rain flashing portion, and corresponds to Figure 7. Figure 9 is a perspective view showing the external shape of the main body member shown in Figure 8, where (1) is the first member and the second member, and (2) is the third member.

[0069] Referring to Figures 8 and 9, the ventilation structure 71 is made up of the same components as the ventilation structure 1 in the first embodiment, with the main body member 2 replaced by the main body member 72. Note that the other components (cover member 3) are the same as those in the ventilation structure 1 in the first embodiment, so their description will not be repeated here.

[0070] The main body member 72 consists of a first member 73 positioned on the roof, a second member 80 placed on the first member 73 and positioned below the cover member 3, and a third member 91 positioned on the waterward side of the first member 73 and the second member 80 and positioned below the cover member 3.

[0071] The first member 73 comprises a first barrier portion 74 that protrudes in a mountain shape on the downstream side, a lower plate portion 75 that extends toward the upstream side from the upstream end of the first barrier portion 74, and a fifth barrier portion 76 that extends upward from the upstream end of the lower plate portion 75.

[0072] The first barrier section 74 includes a rising section 77 extending from the downstream end of the lower plate section 75 to the peak of the mountain shape, and a water-blocking section 78 extending diagonally downward from the peak. Below the rising section 77, a plurality of drainage holes 79 are formed at predetermined intervals.

[0073] The second member 80 includes a fixing portion 81 having a flat surface and having its lower surface abutting against the upper surface of the lower plate portion 75 to attach it to the roof portion, a first support portion 82 having a flat surface and having abutting against the lower surface of the cover member 3 downstream of the fixing portion 81, a second support portion 83 having a flat surface and having its upper surface abutting against the lower surface of the cover member 3 upstream of the fixing portion 81, a flat plate portion 84 having a flat surface and having its lower surface abutting against the upper surface of the lower plate portion 75 downstream of the second support portion 83, a second barrier portion 85 connecting the first support portion 82 and the fixing portion 81, a third barrier portion 86 connecting the second support portion 83 and the fixing portion 81, and a fourth barrier portion 87 extending from the downstream end of the second support portion 83 to the lower plate portion 75 and connecting the second support portion 83 and the flat plate portion 84. A plurality of first openings 88 are formed at predetermined intervals below the second barrier portion 85. Multiple second openings 89 are formed at predetermined intervals above the third barrier portion 86. Multiple third openings 90 are formed at predetermined intervals below the fourth barrier portion 87.

[0074] The third member 91 has an L-shape and includes a flat third support portion 92 and a sixth barrier portion 93 extending perpendicularly from the third support portion 92. An EPDM waterproofing material 94 is attached to the upper surface of the third support portion 92. In this way, the main body member 72 integrates the first member 73 and the second member 80, and positions the third member 91 on the upstream side. As in this embodiment, a main body member 72 composed of the first member 73, the second member 80, and the third member 91 can also be applied as a main body member according to the present invention and is included in the present invention. With this configuration, the first barrier portion prevents rainwater from entering, and the eaves portion, second barrier portion, third barrier portion, fourth barrier portion, fifth barrier portion, and sixth barrier portion cause air attempting to enter the building to meander, making it difficult for rainwater to enter, thus improving waterproofing performance.

[0075] In the installed state, the lower surface of the third support portion 92 abuts against the upper surface of the second support portion 83, and also abuts against the lower surface of the cover member 3. Furthermore, the sixth barrier portion 93 extends downward from the lower surface of the cover member 3 on the upstream side of the fifth barrier portion 76. In addition, the downstream end of the third support portion 92 and the water-sealing material 94 are positioned between the lower surface of the cover member 3 and the second support portion 83. With this configuration, the water-sealing material 94 abuts against the lower surface of the cover member 3, closing the gap between the third support portion 92 and the cover member 3, thereby further improving the waterproofing performance.

[0076] Figure 10 shows the installation of the ventilation structure according to the third embodiment of this invention when used on a double-slope roof.

[0077] Referring to Figure 10, the ventilation structure 96 is installed on a double-slope roof and consists of a pair of main body members 2a and 2b, each installed on a pair of roofing materials, and a cover member 97 positioned to cover the top of each of the pair of main body members 2a and 2b. Note that the main body members 2a and 2b are the same as the main body member 2 of the ventilation structure 1 according to the first embodiment, so their description will not be repeated here.

[0078] The cover member 97 includes a pair of inclined portions 98a and 98b that extend along the slope of the roof portion of the double-slope roof when installed, and a pair of canopy portions 99a and 99b that extend from the downstream ends of the inclined portions 98a and 98b in the direction of the first members 10a and 10b, leaving a predetermined distance.

[0079] With this configuration, even on a double-slope roof, the first barrier prevents rainwater from entering, and the eaves, second barrier, third barrier, fourth barrier, fifth barrier, and sixth barrier cause air attempting to enter the building to meander, making it difficult for rainwater to penetrate, thus improving the waterproofing performance of the ventilation structure. Furthermore, since the main body components used for the flashing can be used to install it on a double-slope roof, it becomes a highly versatile ventilation structure.

[0080] Figure 11 shows the installation of the ventilation structure according to the fourth embodiment of this invention when used on a single-slope roof.

[0081] Referring to Figure 11, the ventilation structure 101 is constructed by replacing the cover member 3 in the ventilation structure 1 according to the first embodiment with a cover member 102, and is installed on a single-slope roof. Note that the other components (main body member 2) are the same as the main body member 2 of the ventilation structure 1 according to the first embodiment, so their description will not be repeated here.

[0082] The cover member 102 includes an inclined portion 103 that extends along the slope of the roof, an overhang portion 104 that extends from the downstream end of the inclined portion 103 to the outside of the first support portion 22 in order to reduce the opening area of ​​the air inlet, and a hanging portion 105 that extends vertically downward from the upstream end of the inclined portion 103. With this configuration, the main body members used for the flashing portion and double-slope roof can be used to install it on a single-slope roof as well, making it a highly versatile ventilation structure.

[0083] Although the above embodiments included a drainage member, the drainage member is not required.

[0084] Furthermore, in each of the embodiments described above, the drainage member had a specific shape, but it may have other shapes as well.

[0085] Furthermore, in each of the embodiments described above, the second barrier section, the third barrier section, the fourth barrier section, the fifth barrier section, and the sixth barrier section were arranged in a parallel state, but they do not necessarily have to be in a parallel state.

[0086] Furthermore, in the embodiments described above, the distance between the barrier sections decreased as one moved towards the water surface, but the distances could also be equal or increase.

[0087] Furthermore, in the first, third, and fourth embodiments described above, the main body member consisted of a first member and a second member, but it may also be made into a single member by welding or bending it beforehand.

[0088] Furthermore, in the second embodiment described above, the main body consisted of a first member, a second member, and a third member, but it may also be made into a single member by welding or bending it beforehand.

[0089] Furthermore, in each of the embodiments described above, the first support portion was composed of a protruding portion and a reinforcing portion, but the reinforcing portion is not required.

[0090] Furthermore, although the reinforcing portion was folded downwards in each of the above embodiments, it may also be folded upwards.

[0091] Furthermore, in each of the embodiments described above, the length of the reinforcing portion was strictly slightly shorter than the length of the protruding portion. However, since the reinforcing portion is constructed by folding back from the tip of the protruding portion, even if there is a slight error in length, it is substantially included within the same length.

[0092] Furthermore, in each of the embodiments described above, the length of the reinforcing portion was substantially the same as the length of the protruding portion, but it may also be formed to be longer than the length of the protruding portion by folding it upwards, for example.

[0093] Furthermore, in each of the embodiments described above, the second barrier section, the third barrier section, and the fourth barrier section were arranged perpendicular to the cover member and the roofing material, but they may be at other angles.

[0094] Furthermore, in each of the above embodiments, the cover member was composed of an inclined portion and a canopy portion, but the canopy portion is not required.

[0095] Furthermore, in each of the embodiments described above, the projection length of the first barrier portion relative to the lower plate portion was set to be longer than the vertical length of the downstream end of the inclined portion relative to the lower plate portion, but it may be set to be the same or shorter.

[0096] Furthermore, in each of the above embodiments, the end of the canopy portion was located above the midpoint of the vertical length of the downstream end of the inclined portion relative to the lower plate portion, but it may also be located below.

[0097] Furthermore, in each of the embodiments described above, the main body member and the cover member were connected by fasteners such as screws, but other fasteners or other fastening means such as adhesive may also be used.

[0098] Furthermore, although the ventilation structure in each of the above embodiments was made of steel plate, it may be made of other materials.

[0099] Furthermore, while the cover component had a specific inclination angle, the inclination angle can be changed to match the slope of the roof. In this case, the change can be made at the factory before shipment, or it can be adjusted at the construction site.

[0100] Furthermore, in each of the embodiments described above, the first, second, third, and fourth openings are formed at specific locations within the second, third, fourth, and fifth barrier sections, but are not limited thereto. They may be formed in the upper, central, or lower portions of the barrier section, or they may be provided across the entire height. The shape of the openings is also not particularly limited. Moreover, although the first, second, third, and fourth openings are formed in multiple locations at predetermined intervals, there may be only one opening.

[0101] Furthermore, while the cover members had specific shapes in the embodiments described above, they may have other shapes as long as they can be installed to cover the ventilation openings formed in the upper part of the roof. Alternatively, the cover members may be fabricated and procured on-site and installed above the main body members. With this configuration, the main body members can be used in common even with different roof shapes such as double-slope (gable, hip), single-slope, and flashing roofs. As a result, a highly versatile ventilation structure is achieved. In addition, since the cover members can be freely selected to match the color of the roofing material for a unified appearance, effects such as improved aesthetics of the roof can be obtained. [Explanation of symbols]

[0102] 1, 71, 96, 101… Ventilation structures 2, 72... Main body components 3, 97, 102... Cover components 11, 74...First barrier section 12, 75...Lower plate part 13, 76... Fifth Barrier Section 14, 92...Third support part 15, 93...6th Barrier Section 21, 81...Fixed part 22, 82...first support part 23, 83...Second support part 24, 85... Second barrier section 25, 86... Third Barrier Section 26, 87... Fourth Barrier Section 28, 88... First opening 29, 89... Second opening 30, 90... Third opening 37, 99, 104...Eave 48…Ventilation vent In each figure, the same reference numeral indicates the same or corresponding part.

Claims

1. A ventilation structure installed to cover a ventilation opening formed in the water-facing portion of a sloping roof, A main body member is installed at the downstream position of the ventilation opening, The system comprises a cover member positioned above the main body member so as to cover the ventilation opening, and having an overhang at its downstream end, The main body member is A first barrier portion that protrudes in a mountain shape downstream from the aforementioned eaves portion, A lower plate portion extending toward the water side from the water side end of the first barrier portion, A fixing part that abuts against the upper surface of the lower plate and is attached to the roof, A first support portion that abuts against the lower surface of the cover member downstream of the aforementioned fixing portion, A second support portion that abuts against the lower surface of the cover member on the waterward side of the aforementioned fixing portion, A second barrier portion is formed by connecting the first support portion and the fixing portion, and having a first opening. A third barrier portion is formed by connecting the second support portion and the fixing portion, and having a second opening. A fourth barrier portion extends from the water-side end of the second support portion to the lower plate portion, and a third opening is formed therein. A fifth barrier portion extends upward from the water-side end of the lower plate portion, on the water-side side of the fourth barrier portion, A ventilation structure comprising a sixth barrier portion extending downward from the lower surface of the cover member on the waterward side of the fifth barrier portion.

2. The main body member further comprises a third support portion which abuts the lower surface of the cover member on the water side of the second support portion, and whose water side end is connected to the upper end of the sixth barrier portion and whose water side end is connected to the upper end of the fifth barrier portion. The ventilation structure according to claim 1, wherein the fifth barrier portion connects the third support portion and the lower plate portion, and a fourth opening is formed.

3. The main body member further comprises a third support portion whose water-side end is connected to the upper end of the sixth barrier portion and which abuts against the lower surface of the cover member on the water-side side of the second support portion. The third support portion includes a water-stopping material attached to the upper surface of the downstream end, The ventilation structure according to claim 1, wherein the downstream end of the third support portion and the water-stopping material are arranged between the lower surface of the cover member and the second support portion.

4. The system further includes a drainage member installed below the main body member, The aforementioned water drainage member includes a first plate portion fixed to the roof portion below the lower plate portion, The first plate portion comprises a second plate portion extending from the water-side end of the first plate portion toward the cover member, The ventilation structure according to any one of claims 1 to 3, wherein the upper end of the second plate portion is positioned higher than the lower end of the sixth barrier portion.

5. The second barrier section, the third barrier section, the fourth barrier section, the fifth barrier section, and the sixth barrier section are arranged in a parallel state. The ventilation structure according to claim 4, wherein the distance between the fifth barrier portion and the sixth barrier portion is set to be smaller than the distance between the third barrier portion and the fourth barrier portion.

6. The fourth opening is formed in the upper part of the fifth barrier portion, The ventilation structure according to claim 2, wherein the sixth barrier portion extends to a position parallel to the lower part of the fifth barrier portion.

7. The roof section includes a wooden base installed on the downstream side of the ventilation opening and roofing material installed on the downstream side of the wooden base. The second plate portion of the aforementioned water drainage member is positioned between the wooden base and the ventilation opening, thereby defining a ventilation path between the second plate portion and the exterior wall base material. The ventilation structure according to claim 4, wherein the fixing portion and the first plate portion are attached to the wooden base by fasteners.

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