JP7774291B2 - Metal roof ventilation flashing and installation method for metal roof ventilation flashing - Google Patents

Description

The present invention relates to a metal roof ventilation flashing that is installed at the junction between the exterior wall of a main building and the lower roof, and that ventilates the attic space under the lower roof, as well as a method for installing the metal roof ventilation flashing.

Patent Document 1 discloses a ventilation flashing that is installed at the joint between a shed and an exterior wall.
By installing the ventilation flashing disclosed in Patent Document 1 at the joint between the roof and the exterior wall, the air in the attic of the roof can be released to the outdoors.

Japanese Patent Application Laid-Open No. 2006-63725

The joint between the eaves and the exterior wall is where rainwater from around the wall meets the eaves, and there is a high risk of water leakage.
In particular, in the case of metal roofs, the risk of water leakage is even higher because the roof slope is often gentle.

The present invention therefore aims to provide a ventilation flashing for metal roofs that has high waterproofing performance, even on metal roofs, which often have a gentle slope.

The metal roof ventilation flashing of the present invention as described in claim 1 is a structure in which a lower roof (A) is adjacent to a main roof (B), rafters (1) are installed on the lower roof (A) at an angle downward, sheathing boards (2) are installed above the rafters (1), a metal roofing material is laid on the upper surface of the sheathing boards (2) as a lower roof, and a sheathing opening (6) is formed in a part of the end of the sheathing boards (2) on the main roof (B) side, and the lower roof (A) is installed at the joint between the outer wall of the adjacent main roof (B) and the lower roof, and the attic space of the lower roof (A) is ventilated through the sheathing opening (6) , and the metal roof ventilation flashing is provided with a flashing cover member (11), and a water stop plate part (11) forming a ventilation passage below the flashing cover member (11). and a covered drainage drain 20 having a drainage drain member 21 arranged above the sheathing opening 6 formed in the roof A, a drainage drain cover member 23 arranged above the drainage drain member 21, and a ventilation opening 22 formed between the drainage drain member 21 and the drainage drain cover member 23. The rain flashing cover member 11 has a wall surface cover surface material 11a installed on the inner surface of the exterior wall and a roof surface cover surface material 11b installed above the lower roof, and the waterstop member 12 has a waterstop bottom surface material 12a arranged on the upper surface of the lower roof and a cover material 12b of the waterstop bottom surface material 12. and a wind and rain guide plate 12b formed on the eaves side, and the ventilation passage is formed between the roof surface side cover surface material 11b and the water stop board bottom surface material 12a, and the drainage member 21 has a roof surface side drainage surface material 21a installed under the lower roof, and a sheathing opening side drainage surface material 21b standing up from the end of the roof surface side drainage surface material 21a on the sheathing opening 6 side, and the drainage cover member 23 has a top surface side drainage cover surface material 23a covering the upper part of the ventilation opening 22, and a drainage cover hanging surface material 23b hanging down from the top surface side drainage cover surface material 23a , and the drainage cover hanging surface material 23b is attached to the sheathing opening side drainage surface material 21b. The ventilation passage is hung down at a position opposite the wind and rain guide plate 12b, and an eaves side ventilation opening 11c is formed on the wind and rain guide plate 12b side of the ventilation passage, and a water stop rear side ventilation opening 12e is formed on the water drain cover hanging surface material 23b side of the ventilation passage, and an exhaust path is formed by the sheathing opening 6, the ventilation opening 22, between the sheathing opening side water drainage surface material 21b and the water drain cover hanging surface material 23b, between the lower end of the water drain cover hanging surface material 23b and the roof surface side water drainage surface material 21a, between the water drain cover hanging surface material 23b and the water stop plate member 12, the water stop rear side ventilation opening 12e, and the eaves side ventilation opening 11c .
The present invention described in claim 2 is characterized in that, in the ventilation flashing for metal roofs described in claim 1, the lower end of the water drain cover hanging surface material 23b is positioned below the water stop plate member 12.
The present invention described in claim 3 is characterized in that, in the ventilation flashing for metal roofs described in claim 1 , the lower end of the drip cover hanging surface material 23b is positioned below the ventilation opening 22.
The present invention described in claim 4 is characterized in that, in a ventilation rain gutter for a metal roof described in any one of claims 1 to 3, the first passage area S1 formed between the water stop member 12 and the water drain cover hanging surface material 23b is larger than the ventilation opening area 22S formed by the ventilation opening 22.
The present invention described in claim 5 is characterized in that, in a ventilation flashing for a metal roof described in any one of claims 1 to 4, the drainage member 21 and the drainage cover member 23 are formed by bending a plate material.
The present invention described in claim 6 is characterized in that, in a ventilation gutter for a metal roof described in any one of claims 1 to 5, it has a water-repellent water-repellent surface material 21c bent from the upper end of the water-repellent surface material 21b on the sheathing opening side toward the eaves, and the ventilation opening 22 is formed in a plate material further extending from the lower end of the water-repellent water-repellent surface material 21c.
The present invention described in claim 7 is characterized in that, in the ventilated flashing for metal roofs described in any one of claims 1 to 6, the covered drainage gutter 20 is provided with a first ventilation spacer 41 and a first ventilation spacer 42, the first ventilation spacer 41 and the first ventilation spacer 42 are formed at both longitudinal ends of the sheathing opening side drainage panel material 21b, the first ventilation spacer 41 protruding from the sheathing opening side drainage panel material 21b toward the main building B, and the first ventilation spacer 42 protruding from the sheathing opening side drainage panel material 21b toward the drainage cover hanging panel material 23b.
The construction method for a ventilated flashing for a metal roof of the present invention as described in claim 8 is characterized by comprising a covered flashing construction step of using the ventilated flashing for a metal roof as described in any one of claims 1 to 7 and constructing the covered flashing 20 at the joint between the exterior wall and the lower roof, and a ventilation flashing main body construction step of placing the water stop member 12 on the lower roof and constructing the ventilation flashing main body 10.
The present invention as described in claim 9 is characterized in that in the construction method of the ventilation flashing for metal roofs as described in claim 8, in the construction process of the ventilation flashing main body, the water stop member 12 is placed on the lower roof via a base wood 7, and the base wood 7 is selected so that the roof surface side cover surface material 11b is lower on the eaves side than on the main building B side.

The metal roof ventilation flashing of the present invention is equipped with a covered flashing that includes a flashing member and a flashing cover member. The flashing cover member has a flashing cover hanging surface member that hangs down in a position facing the ventilation opening. This prevents rainwater blowing in from the ventilation flashing body from entering the sheathing opening through the ventilation opening, thereby improving waterproofing performance.

1 is a cross-sectional view showing a ventilation flashing for a metal roof according to one embodiment of the present invention; FIG. 10 is a cross-sectional view showing the ventilation flashing body used in the metal roof ventilation flashing. A cross-sectional view showing the drainage drain with cover used in the metal roof ventilation flashing Enlarged cross-sectional view of the main part of the same ventilation flashing for metal roofs Cross-sectional view showing the installation method of the same ventilation flashing for metal roofs FIG. 1 is a cross-sectional view showing a ventilation flashing for a metal roof according to another embodiment of the present invention. FIG. 10 is a cross-sectional view showing the ventilation flashing body used in the metal roof ventilation flashing. A cross-sectional view showing the drainage drain with cover used in the metal roof ventilation flashing Enlarged cross-sectional view of the main part of the same ventilation flashing for metal roofs Cross-sectional view showing the installation method of the same ventilation flashing for metal roofs Cross-sectional view showing the installation status of the same ventilation flashing for metal roofs

A ventilating flashing for a metal roof according to a first embodiment of the present invention comprises a ventilating flashing body having a flashing cover member and a water stop member forming a ventilation passage below the flashing cover member, a drainage member arranged above a sheathing opening formed in the roof shed, a drainage member cover member arranged above the drainage member, and a covered drainage member having a ventilation opening formed between the drainage member and the drainage cover member, the flashing cover member having a wall-side cover face material installed on the inside surface of the exterior wall and a roof-side cover face material installed above the lower roof, the waterstop member having a waterstop bottom face material installed on the upper surface of the lower roof and a wind and rain guide plate formed on the eaves side of the waterstop bottom face material, a ventilation passage is formed between the roof-side cover face material and the waterstop bottom face material, and the drainage member is arranged below the lower roof and a sheathing opening-side water draining surface material that is raised from the sheathing opening-side end of the roof surface-side water draining surface material, and the drainage cover member has a top surface-side drainage cover surface material that covers the top of the ventilation opening, and a drainage cover hanging surface material that hangs down from the top surface-side drainage cover surface material , and the drainage cover hanging surface material hangs down in a position facing the sheathing opening-side water draining surface material, and an eaves side ventilation opening is formed on the wind and rain guide plate side of the ventilation passage, and a water stop rear side ventilation opening is formed on the drainage cover hanging surface material side of the ventilation passage, and an exhaust path is formed by the sheathing opening, the ventilation opening, between the sheathing opening-side water draining surface material and the sheathing opening-side water draining surface material, between the lower end of the drainage cover hanging surface material and the roof surface-side water draining surface material, between the drainage cover hanging surface material and the water stop member, the water stop rear side ventilation opening, and the eaves side ventilation opening . According to this embodiment, a covered drainer is provided which has a drainer member and a drainer cover member, and the drainer cover member has a drainer cover hanging surface material, and a ventilation opening is arranged between the drainer cover hanging surface material and the drainer surface material on the sheathing opening side, so that rainwater blowing in from the ventilation rain gutter body can be prevented from entering the sheathing opening side through the ventilation opening, thereby improving waterproof performance.

The second embodiment of the present invention is a ventilation flashing for metal roofs according to the first embodiment, in which the lower end of the flashing cover hanging panel is positioned below the waterstop member. According to this embodiment, the flashing cover hanging panel can block rainwater from blowing in through the waterstop member.

In the third embodiment of the present invention, the lower end of the flashing cover hanging panel is positioned below the ventilation opening in the metal roof ventilating flashing of the first embodiment. According to this embodiment, the flashing cover hanging panel prevents rainwater from entering the ventilation opening.

The fourth embodiment of the present invention is a ventilated flashing for metal roofs according to any one of the first to third embodiments, in which the first passage area formed between the waterstop member and the hanging flashing cover surface member is larger than the ventilation opening area of the ventilation opening. According to this embodiment, by forming a first passage area larger than the ventilation opening area between the waterstop member and the hanging flashing cover surface member, it is possible to reduce the flow rate of rainwater blowing in from the waterstop member and prevent rainwater from entering the ventilation opening.

The fifth embodiment of the present invention is a metal roof ventilation flashing according to any one of the first to fourth embodiments, in which the drainage member and drainage cover member are formed by bending a plate material. According to this embodiment, the drainage member and drainage cover member are formed from the same material, thereby improving workability.

The sixth embodiment of the present invention is a metal roof ventilation flashing according to any one of the first to fifth embodiments, which has a water-repelling flashing panel bent from the top end of the sheathing-opening-side flashing panel toward the eaves, and has a ventilation opening formed in a plate member extending further from the bottom end of the water-repelling flashing panel. According to this embodiment, the water-repelling flashing panel bent from the top end of the sheathing-opening-side flashing panel toward the eaves prevents rainwater blowing in from the ventilation flashing body, even if it rises along the sheathing-opening-side flashing panel due to strong wind pressure from outside, by causing the water-repelling flashing panel to fall onto the roof-side flashing panel. This prevents rainwater from entering the sheathing opening through the ventilation opening, improving waterproofing performance.

The seventh embodiment of the present invention is a ventilated flashing for metal roofs according to any one of the first to sixth embodiments, in which the covered flashing is provided with a first ventilation spacer and a second ventilation spacer, the first ventilation spacer and the second ventilation spacer being formed at both longitudinal ends of the sheathing opening-side flashing panel, with the first ventilation spacer protruding from the sheathing opening-side flashing panel toward the main building, and the second ventilation spacer protruding from the sheathing opening-side flashing panel toward the flashing cover hanging panel. According to this embodiment, the provision of the first ventilation spacer and the second ventilation spacer prevents deformation of the sheathing opening-side flashing panel and makes it possible to maintain constant the passage area of the sheathing opening-side flashing panel on the main building side and the passage area of the sheathing opening-side flashing panel on the top-side flashing cover panel side.

The eighth embodiment of the present invention provides a metal roof ventilation flashing installation method that uses a metal roof ventilation flashing according to any one of the first to seventh embodiments and includes a covered flashing installation step in which a covered flashing is installed at the junction between the exterior wall and the lower roof, and a ventilation flashing main body installation step in which a water stop member is placed on the lower roof and the ventilation flashing main body is installed. According to this embodiment, the covered flashing can be installed first, followed by the ventilation flashing main body, making it easy to install a covered flashing with excellent waterproofing performance.

The ninth embodiment of the present invention is a method for installing a ventilated flashing for a metal roof according to the eighth embodiment, in which, in the ventilation flashing main body installation process, a waterstop member is placed on the lower roof via a wooden base, and the wooden base is selected so that the roof surface cover face material is positioned lower on the eaves side than on the main building side. According to this embodiment, the ventilation flashing for a metal roof does not have a reverse slope, and rainwater can be channeled toward the eaves side.

An embodiment of a metal roof ventilation flashing according to the present invention will now be described.
FIG. 1 is a cross-sectional view of a ventilating flashing for a metal roof according to this embodiment, FIG. 2 is a cross-sectional view of a ventilating flashing body used in the ventilating flashing for a metal roof, FIG. 3 is a cross-sectional view of a drainpipe with a cover used in the ventilating flashing for a metal roof, and FIG. 4 is an enlarged cross-sectional view of a main part of the ventilating flashing for a metal roof.

In the structure shown in Figure 1, rafters 1 are installed on the roof shed A at an angle downward. Sheathing boards 2 are installed above the rafters 1, and roofing material 3 is laid on top of the sheathing boards 2. The roofing material 3 is a vertically laid metal roofing material. The main building B adjacent to the roof shed A is installed with exterior wall base material 4 and exterior wall material 5. A sheathing opening 6 is formed in part of the end of the sheathing boards 2 on the main building B side. A base wood 7 is placed on the end of the roofing material 3 on the main building B side.
The metal roof ventilation flashing of this embodiment is installed at the joint between the exterior wall of the main building B and the roof material 3 of the shed A, and ventilates the attic space of the shed A.
As shown in Figure 1, the ventilating flashing for metal roofs according to this embodiment includes a ventilating flashing body 10 and a covered drain 20. The ventilating flashing body 10 is fixed to a wooden substrate 7 with fasteners 30.

The ventilation flashing body 10 will be described with reference to Figure 2. Figure 2(a) is an assembly diagram, and Figure 2(b) is an exploded view.
The ventilation flashing body 10 has a flashing cover member 11, a water stop member 12 that forms a ventilation passage below the flashing cover member 11, and an internal resistance member 13 arranged within the water stop member 12.
The rain gutter cover member 11 has a wall surface cover surface material 11a installed on the inner surface of the exterior wall material 5, a roof surface cover surface material 11b installed above the roof material 3 of the eaves A, an eaves side opening surface material 11d hanging down from the eaves side end of the roof surface cover surface material 11b to form an eaves side ventilation opening 11c, and an extension surface material 11e extending toward the eaves side from the lower end of the eaves side opening surface material 11d.
The wall surface side cover surface material 11a, the roof surface side cover surface material 11b, the eaves side opening surface material 11d, and the extension surface material 11e are formed by bending plate material, and the eaves side ventilation opening 11c is formed by punching out a part of the eaves side opening surface material 11d.

The waterstop member 12 has a waterstop bottom surface material 12a placed on the upper surface of the roof material 3, a wind and rain guide plate 12b formed on the eaves side of the waterstop bottom surface material 12a, a waterstop rear surface material 12c raised from the sheathing opening 6 side of the waterstop bottom surface material 12a, and a waterstop mounting surface material 12d formed on the upper end of the waterstop rear surface material 12c.
The wind and rain guide plate 12b comprises a guide plate upright plate 12b1, a guide plate inclined plate 12b2, and a guide plate end plate 12b3. The guide plate upright plate 12b1 is positioned opposite the eaves-side opening surface material 11d. The guide plate inclined plate 12b2 is positioned closer to the eaves than the guide plate upright plate 12b1. The guide plate inclined plate 12b2 has an upper end that is continuous with the upper end of the guide plate upright plate 12b1 and a lower end that is continuous with the guide plate end plate 12b3. The guide plate inclined plate 12b2 is inclined by positioning its lower end closer to the eaves than its upper end. The guide plate end plate 12b3 extends from the lower end of the guide plate inclined plate 12b2 toward the waterstop bottom surface material 12a.
The waterstop bottom surface material 12a, the wind and rain guide plate 12b, the waterstop rear surface material 12c, and the waterstop mounting surface material 12d are formed by bending a plate material.

The internal resistance member 13 has a mounting surface 13a that is attached to the waterstop bottom surface material 12a, a forward-inclined resistance surface 13b that extends from the mounting surface 13a toward the wind and rain guide plate 12b, and a rearward-inclined resistance surface 13c that extends from the mounting surface 13a toward the waterstop rear surface material 12c. The forward-inclined resistance surface 13b is shorter than the rearward-inclined resistance surface 13c. No opening is formed in the forward-inclined resistance surface 13b, and a ventilation path is formed between the tip of the forward-inclined resistance surface 13b and the roof surface cover surface material 11b. An opening is formed in the rearward-inclined resistance surface 13c, and the tip of the rearward-inclined resistance surface 13c abuts or is close to the roof surface cover surface material 11b. The opening formed in the rearward-inclined resistance surface 13c forms a ventilation path.

The covered drainer 20 will be described using Figure 3. Figure 3(a) is a side view of the covered drainer, Figure 3(b) is a front view of the main part of the drainer cover member, Figure 3(c) is a cross-sectional view of the drainer cover member, Figure 3(d) is a front view of the main part of the drainer member, and Figure 3(c) is a cross-sectional view of the drainer member.
The covered drain 20 has a drain member 21 arranged above the sheathing opening 6 formed in the roof A, a drain cover member 23 arranged above the drain member 21, and a ventilation opening 22 formed between the drain member 21 and the drain cover member 23. The upper part of the ventilation opening 22 is covered by the drain cover member 23.
The drainage member 21 has a roof surface side drainage surface material 21a installed below the roof material 3 of the eaves A, and a sheathing opening side drainage surface material 21b raised from the end of the roof surface side drainage surface material 21a on the sheathing opening 6 side.
The ventilation opening 22 is formed at the top of the drainage surface material 21b on the roof opening side.
The roof surface side water-repellent surface material 21a and the sheathing opening side water-repellent surface material 21b are formed by bending a plate material, and the ventilation opening 22 is formed by punching out a part of the sheathing opening side water-repellent surface material 21b.
The drain cover member 23 has a top-side drain cover surface material 23a that covers the upper part of the ventilation opening 22, and a drain cover hanging surface material 23b that hangs down from the top-side drain cover surface material 23a in a position facing the ventilation opening 22. The top-side drain cover surface material 23a and the drain cover hanging surface material 23b are formed by bending a plate material.

As shown in Figure 4, the metal roof ventilation flashing of this embodiment includes a covered flashing 20 having a flashing member 21 and a flashing cover member 23. The flashing cover member 23 has a flashing cover hanging surface member 23b, which hangs down in a position facing the ventilation opening 22. This prevents rainwater blowing in from the ventilation flashing body 10 from entering the sheathing opening 6 through the ventilation opening 22, thereby improving waterproofing performance.
In addition, in the metal roof ventilation flashing of this embodiment, the lower end of the flashing cover hanging surface member 23b is positioned below the water stop member 12. Therefore, rainwater blowing in from the water stop member 12 can be blocked by the flashing cover hanging surface member 23b.
Furthermore, in the metal roof ventilation flashing of this embodiment, the lower end of the drip cover hanging surface member 23b is positioned below the ventilation opening 22. Therefore, the position facing the ventilation opening 22 is completely covered by the drip cover hanging surface member 23b, thereby preventing rainwater from entering the ventilation opening 22.

In addition, the metal roof ventilation flashing of this embodiment has a first passage area S1 formed between the waterstop member 12 and the flashing cover hanging surface member 23b that is larger than the rear-side ventilation opening area 12eS of the rear-side ventilation opening 12e of the waterstop. Therefore, by forming a first passage area S1 larger than the rear-side ventilation opening area 12eS between the waterstop member 12 and the flashing cover hanging surface member 23b, the flow rate of rainwater blowing in from the waterstop member 12 can be reduced, preventing rainwater from entering the ventilation opening 22.

FIG. 5 is a cross-sectional view showing the method of installing a ventilation flashing for a metal roof according to this embodiment.
As shown in FIG. 5( a ), in the covered drainpipe installation process, the covered drainpipe 20 is installed at the joint between the exterior wall and the lower roof.
5(b), in the ventilation flashing body installation process, the water stop member 12 is placed on the roof material 3 of the eaves A via the wooden base material 7, and the ventilation flashing body 10 is installed. The wooden base material 7 is selected so that the roof surface cover surface material 11b is positioned lower on the eaves side than on the main building B side.
In this way, the covered gutter 20 can be installed first, followed by the main flashing 10, making it easy to install the covered gutter 20 with excellent waterproofing. Furthermore, by selecting the base wood 7 so that the roof-side cover face material 11b is positioned lower on the eaves side than on the main roof B side, the metal roof ventilation flashing does not have a reverse slope, allowing rainwater to flow toward the eaves side.

A ventilation flashing for a metal roof according to another embodiment of the present invention will now be described.
FIG. 6 is a cross-sectional view showing a ventilating flashing for a metal roof according to this embodiment, FIG. 7 is a cross-sectional view showing a ventilating flashing body used in the same ventilating flashing for a metal roof, FIG. 8 is a cross-sectional view showing a drain with a cover used in the same ventilating flashing for a metal roof, and FIG. 9 is an enlarged cross-sectional view of a main part of the same ventilating flashing for a metal roof.

In the structure shown in Figure 6, rafters 1 are installed on the roof shed A at an angle downward. Sheathing boards 2 are installed above the rafters 1, and roofing material 3 is laid on top of the sheathing boards 2. The roofing material 3 is a vertically laid metal roofing material. The main building B adjacent to the roof shed A is installed with exterior wall base material 4 and exterior wall material 5. A sheathing opening 6 is formed in part of the end of the sheathing boards 2 on the main building B side. A base wood 7 is placed on the end of the roofing material 3 on the main building B side.
The metal roof ventilation flashing of this embodiment is installed at the joint between the exterior wall of the main building B and the roof material 3 of the shed A, and ventilates the attic space of the shed A.
As shown in Figure 6, the ventilating flashing for metal roofs according to this embodiment includes a ventilating flashing body 10 and a covered drain 20. The ventilating flashing body 10 is fixed to the wooden substrate 7 with fasteners 30.

The ventilation flashing body 10 will be described with reference to Figure 7. Figure 7(a) is an assembly diagram, and Figure 7(b) is an exploded view.
The ventilation flashing body 10 has a flashing cover member 11, a water stop member 12 that forms a ventilation passage below the flashing cover member 11, and an internal resistance member 13 arranged within the water stop member 12.
The flashing cover member 11 has a wall-side cover surface material 11a installed on the inside surface of the exterior wall material 5, a roof-side cover surface material 11b installed above the roof material 3 of the eaves A, an eaves-side opening surface material 11d hanging down from the eaves-side end of the roof-side cover surface material 11b to form an eaves-side ventilation opening 11c, and an extension surface material 11e extending from the lower end of the eaves-side opening surface material 11d toward the eaves side. The eaves-side opening surface material 11d is inclined by positioning its lower end closer to the eaves side than its upper end.
The wall surface side cover surface material 11a, the roof surface side cover surface material 11b, the eaves side opening surface material 11d, and the extension surface material 11e are formed by bending plate material, and the eaves side ventilation opening 11c is formed by punching out a part of the eaves side opening surface material 11d.

The waterstop member 12 comprises a waterstop bottom surface material 12a placed on the upper surface of the roof material 3, a wind and rain guide plate 12b formed on the eaves side of the waterstop bottom surface material 12a, a waterstop rear surface material 12c standing up from the sheathing opening 6 side of the waterstop bottom surface material 12a, and a waterstop mounting surface material 12d formed on the upper end of the waterstop rear surface material 12c. The waterstop rear surface material 12c is inclined by positioning its lower end closer to the eaves than its upper end.
The wind and rain guide plate 12b comprises a guide plate rising plate 12b1, a guide plate inclined plate 12b2, and a guide plate end plate 12b3. The guide plate rising plate 12b1 is positioned opposite the eaves-side opening surface material 11d. The guide plate inclined plate 12b2 is positioned closer to the eaves than the guide plate rising plate 12b1. The upper end of the guide plate inclined plate 12b2 is continuous with the upper end of the guide plate rising plate 12b1, and the lower end is continuous with the guide plate end plate 12b3. The guide plate inclined plate 12b2 is inclined by positioning its lower end closer to the eaves than the upper end. The guide plate end plate 12b3 is bent from the lower end of the guide plate inclined plate 12b2 so as to overlap the guide plate inclined plate 12b2.
The waterstop bottom surface material 12a, the wind and rain guide plate 12b, the waterstop rear surface material 12c, and the waterstop mounting surface material 12d are formed by bending a plate material.

The internal resistance member 13 has a mounting surface 13a that is attached to the waterstop bottom surface material 12a, a forwardly inclined resistance surface 13b that extends from the mounting surface 13a toward the wind and rain guide plate 12b, and a rearwardly inclined resistance surface 13c that extends from the mounting surface 13a toward the waterstop rear surface material 12c. Openings are formed in the forwardly inclined resistance surface 13b and the rearward inclined resistance surface 13c, and the tips of the forwardly inclined resistance surface 13b and the rearward inclined resistance surface 13c abut or are close to the roof surface cover surface material 11b. The openings formed in the forwardly inclined resistance surface 13b and the rearward inclined resistance surface 13c form ventilation paths.

The covered drainer 20 will be described with reference to Fig. 8. Fig. 8(a) is a side view of the covered drainer, and Fig. 8(b) and Fig. 8(c) are photographs showing the main parts of the covered drainer.
The covered drain 20 has a drain member 21 arranged above the sheathing opening 6 formed in the roof A, a drain cover member 23 arranged above the drain member 21, and a ventilation opening 22 formed between the drain member 21 and the drain cover member 23. The upper part of the ventilation opening 22 is covered by the drain cover member 23.
The drainage member 21 includes a roof-side drainage panel 21a installed below the roof material 3 of the eaves A, a sheathing-opening-side drainage panel 21b that rises from the end of the roof-side drainage panel 21a on the sheathing opening 6 side, and a water-repellent drainage panel 21c that is bent from the top end of the sheathing-opening-side drainage panel 21b toward the eaves. The water-repellent drainage panel 21c is inclined, with its lower end lower than its upper end. Even if the lower and upper ends of the water-repellent drainage panel 21c are at the same height, i.e., the water-repellent drainage panel 21c is horizontal, rainwater blowing in from the ventilation flashing body 10 can still fall onto the roof-side drainage panel 21a.
The ventilation opening 22 is formed in a plate material that extends further from the lower end of the water-returning water-draining surface material 21c. The plate material that forms the ventilation opening 22 is also inclined in the same way as the water-returning water-draining surface material 21c. Therefore, the ventilation opening 22 is also inclined.
The drain cover member 23 has a top-side drain cover panel 23a that covers the upper part of the ventilation opening 22, and a drain cover hanging panel 23b that hangs down from the top-side drain cover panel 23a in parallel with the sheathing opening-side drain cover panel 21b. The lower part of the drain cover hanging panel 23b is bent up toward the sheathing opening-side drain cover panel 21b, and the raised end reaches the lower end of the plate that forms the ventilation opening 22.
The top-side drain cover panel 23a, the drain cover hanging panel 23b, the board forming the ventilation opening 22, the water return drain panel 21c, the sheathing opening side drain panel 21b, and the roof side drain panel 21a are all formed by bending a single board, and the ventilation opening 22 is formed by punching out a part of the board. The ventilation opening 22 is formed between the sheathing opening side drain panel 21b and the top-side drain cover panel 23a so that the eaves side is lower.

The covered drainer 20 is equipped with a first ventilation spacer 41 and a second ventilation spacer 42. The first ventilation spacer 41 and the second ventilation spacer 42 are formed at both longitudinal ends of the drainage surface material 21b on the sheathing opening side, with the first ventilation spacer 41 protruding from the sheathing opening side drainage surface material 21b toward the purlin B, and the second ventilation spacer 42 protruding from the sheathing opening side drainage surface material 21b toward the drainage cover hanging surface material 23b.
As shown in FIG. 8(b), the first ventilation spacer 41 and the second ventilation spacer 42 are formed integrally with the roof opening-side drainage surface material 21b at the longitudinal ends of the roof opening-side drainage surface material 21b.
As shown in Figure 8 (c), the first ventilation spacer 41 is bent toward the upper passage of the roof opening 6, and the second ventilation spacer 42 is bent toward the passage on the top surface drain cover panel material 23a side.

As shown in Figure 9, the metal roof ventilation flashing of this embodiment includes a covered flashing 20 having a flashing member 21 and a flashing cover member 23. The flashing cover member 23 has a hanging flashing cover panel 23b, and a ventilation opening 22 is located between the hanging flashing cover panel 23b and the sheathing opening-side flashing panel 21b. Furthermore, a water-repellent flashing panel 21c is bent from the top end of the sheathing opening-side flashing panel 21b toward the eaves, and is tilted so that the ventilation opening 22 side is lower. Therefore, even if rainwater blowing in from the ventilation flashing body 10 rises along the sheathing opening-side flashing panel 21b due to strong wind pressure from outside, the water-repellent flashing panel 21c causes it to fall onto the roof-side flashing panel 21a, preventing it from infiltrating the sheathing opening 6 through the ventilation opening 22 and improving waterproofing performance.
In addition, in the metal roof ventilation flashing of this embodiment, the lower end of the flashing cover hanging surface member 23b is positioned below the water stop member 12. Therefore, rainwater blowing in from the water stop member 12 can be blocked by the flashing cover hanging surface member 23b.
In addition, in the metal roof ventilation flashing of this embodiment, the lower end of the drip cover hanging surface member 23b is positioned below the ventilation opening 22. Therefore, the drip cover hanging surface member 23b can prevent rainwater from entering the ventilation opening 22.

In addition, the metal roof ventilation flashing of this embodiment has a first passage area S1 formed between the waterstop member 12 and the flashing cover hanging surface member 23b that is larger than the rear-side ventilation opening area 12eS of the rear-side ventilation opening 12e of the waterstop. Therefore, by forming a first passage area S1 larger than the rear-side ventilation opening area 12eS between the waterstop member 12 and the flashing cover hanging surface member 23b, the flow rate of rainwater blowing in from the waterstop member 12 can be reduced, preventing rainwater from entering the ventilation opening 22.

FIG. 10 is a cross-sectional view showing the method of installing a ventilation flashing for a metal roof according to this embodiment.
As shown in FIG. 10(a), in the covered drainpipe installation process, the covered drainpipe 20 is installed at the joint between the exterior wall and the lower roof.
10(b), in the ventilation flashing body installation process, the water stop member 12 is placed on the roof material 3 of the eaves A via the wooden base material 7, and the ventilation flashing body 10 is installed. The wooden base material 7 is selected so that the roof surface cover surface material 11b is positioned lower on the eaves side than on the main building B side.
In this way, the covered gutter 20 can be installed first, followed by the main flashing 10, making it easy to install the covered gutter 20 with excellent waterproofing. Furthermore, by selecting the base wood 7 so that the roof-side cover face material 11b is positioned lower on the eaves side than on the main roof B side, the metal roof ventilation flashing does not have a reverse slope, allowing rainwater to flow toward the eaves side.

FIG. 11 is a cross-sectional view showing the state of installation of a ventilation flashing for a metal roof according to this embodiment.
Figure 11(a) shows the state after installation on a structure with a roof slope of 4.5 sun, and Figure 11(b) shows the state after installation on a structure with a roof slope of 0.5 sun.
In this way, the metal roof ventilation flashing of this embodiment can be installed on structures with different roof slopes by changing the angle of the roof surface side cover surface material 11b relative to the wall surface side cover surface material 11a, and the angle of the roof surface side water-repellent surface material 21a relative to the sheathing opening side water-repellent surface material 21b.
11(c) and 11(d) show a comparative example in which the first ventilation spacer and the second ventilation spacer are not provided.
If the first ventilation spacer 41 and the second ventilation spacer 42 are not provided, the sheathing opening side drainage panel 21b will be deformed when the angle of the roof surface side drainage panel 21a relative to the sheathing opening side drainage panel 21b is changed, as shown in Figures 11(c) and 11(d).
Therefore, by providing the first ventilation spacer 41 and the second ventilation spacer 42, as shown in Figures 11(a) and 11(b), deformation of the sheathing opening side drainage panel material 21b can be prevented, and the passage area on the main building B side of the sheathing opening side drainage panel material 21b and the passage area on the top side drainage cover panel material 23a side of the sheathing opening side drainage panel material 21b can be kept constant.

The present invention provides a ventilation flashing for metal roofs that has both specified watertightness and specified ventilation performance.

DESCRIPTION OF SYMBOLS 1 Rafter 2 Sheathing board 3 Roof material 4 Exterior wall underlayment material 5 Exterior wall material 6 Sheathing opening 7 Underlayment wood 10 Ventilation flashing body 11 Flashing cover member 11a Wall side cover surface material 11b Roof side cover surface material 11c Eaves side ventilation opening 11d Eaves side opening surface material 11e Extension surface material 12 Waterstop member 12a Waterstop bottom surface material 12b Wind and rain guide plate 12b1 Guide plate rising plate 12b2 Guide plate inclined plate 12b3 Guide plate end plate 12c Waterstop rear surface material 12d Waterstop mounting surface material 12e Waterstop rear side ventilation opening 12eS Waterstop rear side ventilation opening area 13 Internal resistance member 13a Mounting surface 13b Forward inclined resistance surface 13c Rear inclined resistance surface 20 Covered drain 21 Drain member 21a Roof surface side drain material 21b Sheathing opening side drain material 21c Water return drain material 22 Ventilation opening 22S Ventilation opening area 23 Drain cover member 23a Top surface side drain cover surface material 23b Drain cover hanging surface material 30 Fixing device 41 First ventilation spacer 42 Second ventilation spacer A Lower roof B Main roof S1 First passage area

Claims (9)

The structure has a shed adjacent to the main building, rafters tilted diagonally downward on the shed, sheathing boards installed above the rafters, metal roofing material laid on top of the sheathing boards as a sub-roof, and a sheathing opening formed in part of the end of the sheathing boards on the main building side.
A metal roof ventilation flashing is installed at the joint between the outer wall of the main house adjacent to the roof and the lower roof, and exhausts the attic space of the roof from the roof opening .
a ventilation flashing body having a flashing cover member and a water stop member forming a ventilation passage below the flashing cover member;
The drainage drain is provided with a drainage drain member arranged above the sheathing opening formed in the eaves , a drainage drain cover member arranged above the drainage drain member, and a drainage drain with a cover having a ventilation opening formed between the drainage drain member and the drainage drain cover member,
The rain flashing cover member is
A wall surface cover surface material installed on the inner surface of the outer wall;
a roof surface side cover surface material installed above the lower roof,
The waterstop member is
A waterstop bottom material arranged on the upper surface of the lower roof;
a wind and rain guide plate formed on the eaves side of the waterstop bottom material;
and
The ventilation passage is formed between the roof surface cover surface material and the waterstop bottom surface material,
The drainage member is
A roof surface side water drainage surface material installed below the lower roof;
a sheathing opening side drainage surface material that is raised from the end of the sheathing opening side of the roof surface side drainage surface material;
The drain cover member is
A top surface drainage cover surface material covering the upper part of the ventilation opening;
A drain cover hanging surface material hanging down from the top surface side drain cover surface material ,
The drain cover hanging surface material is hung down to a position facing the roof opening side drain surface material,
An eaves-side ventilation opening is formed on the wind and rain guide plate side of the ventilation passage,
A rear side ventilation opening of the water stop plate is formed on the side of the hanging surface material of the drain cover of the ventilation passage,
A ventilation flashing for a metal roof, characterized in that an exhaust path is formed by the sheathing opening, the ventilation opening, the space between the sheathing opening side water drainage surface material and the water drainage cover hanging surface material, the space between the lower end of the water drainage cover hanging surface material and the roof surface side water drainage surface material, the space between the water drainage cover hanging surface material and the water stop member, the ventilation opening on the rear side of the water stop, and the eaves side ventilation opening . 2. The ventilation flashing for a metal roof according to claim 1, wherein the lower end of the drip cover hanging surface member is positioned below the water stop member. 2. The metal roof ventilation flashing according to claim 1 , wherein the lower end of the hanging panel of the drip cover is positioned below the ventilation opening. A ventilation rain gutter for a metal roof as described in any one of claims 1 to 3, characterized in that the first passage area formed between the water stop member and the water drip cover hanging surface material is larger than the ventilation opening area formed by the ventilation opening. 5. A ventilation flashing for a metal roof according to claim 1, wherein the drainage member and the drainage cover member are formed by bending a plate material. A water-repellent surface material is provided which is bent from the upper end of the sheathing opening side water-repellent surface material to the eaves side,
6. A ventilation flashing for a metal roof according to claim 1, wherein the ventilation opening is formed in a plate material that extends further from the lower end of the water-repelling water-repelling surface material. The covered drainer includes a first ventilation spacer and a second ventilation spacer,
The first ventilation spacer and the second ventilation spacer are formed at both ends in the longitudinal direction of the roof opening side water drainage surface material,
The first ventilation spacer protrudes from the roof opening side water-repellent surface material toward the main building side,
7. A ventilation flashing for a metal roof according to claim 1, wherein the second ventilation spacer protrudes from the sheathing opening side flashing surface material toward the flashing cover hanging surface material. The ventilation flashing for a metal roof according to any one of claims 1 to 7 is used,
A covered drainage drain installation process for installing the covered drainage drain at the joint between the exterior wall and the lower roof;
and a ventilation flashing body installation step of placing the waterstop member on the lower roof and installing the ventilation flashing body. In the ventilation flashing body installation process,
The waterstop member is placed on the lower roof via a wooden base,
The method for installing a ventilation flashing for a metal roof according to claim 8, characterized in that the base wood is selected so that the roof surface side cover surface material is positioned lower on the eaves side than on the main building side.