JP2000110316A - Ridge ventilation structure and ridge ventilation equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide ridge ventilation structure, which can obtain a sufficient amount of ventilation, prevent the infiltration of rainwater into an attic space even when the ridge ventilation structure is applied to a roofing material having irregularities in a surface such as a corrugated tile, and is free of trouble even in the installation of a ridge tile. SOLUTION: A ventilating cylinder 3A, which is opened in the vertical direction along a ridge and in which a back board piece 36 is formed on the outside of an upper edge section and a fixing piece 35 is installed on the outside of a lower edge section, is mounted on an air gap 2 formed in the ridge section of a roof foundation material 1 in a series extending over the approximately overall length of the ridge, and the upper section of the ventilating cylinder 3A is convered by forming an air gap 4 between the ventilating cylinder 3A and a cover body 3B by the cover body 3B with a to-face board 37 formed in an approximately chevron-shaped or approximately arcuate cross section and a pair of drooping pieces 38 extended to lower sections from the both side edge of the top-face board 37. Coping 7 are annexed near edge sections on the ridge side of a roofing material 5 roofed up to the upper section of the above-mentioned fixing piece 35 through ridge sealing strips 6, a ridge covering material 8 is fitted while forming an air gap 9 among the ridge covering material 8 and the copings 7, and the above-mentioned cover body 3B is covered.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ridge ventilation structure for ventilating the back of a hut at a ridge portion of a sloped roof, and a ridge ventilation device provided for the same.

[0002]

2. Description of the Related Art In recent years, the degree of airtightness in a house has been increased, and dew condensation has been apt to occur. Have been. For this reason, it is necessary to enhance the ventilation performance of the house to prevent dew condensation, and it is particularly important to efficiently exhaust indoor air from the back of the house from the viewpoint of ventilation efficiency.

Therefore, heretofore, for example, the following has been proposed as a ridge ventilation structure for ventilating the back of a hut at a ridge portion of a sloped roof.

The first is a ridge ventilation structure described in Japanese Utility Model Laid-Open Publication No. Sho 61-152620. As shown in FIG. 9, a butt portion of a roof base material a and a roofing material b in the ridge extends in the ridge direction. A main body d having a semi-cylindrical shape formed by curving an iron plate or the like while providing a gap c along the main body, a mounting portion e formed on both lower edges of the main body d, and a mounting portion e The gap c is covered by a ridge covering member h having a draining plate member g having a drainage piece f formed at the tip from the lower edge and extending inward and upward, and discharges air inside the ridge tube main body d from both ends of the ridge. It is like that.

[0005] The second is a ridge ventilation structure described in Japanese Utility Model Laid-Open No. 61-76033. As shown in FIG. 10, a gap c is formed along a ridge direction in a butt portion of a roof base material a in a ridge. A draining plate fixing bracket j is laid over the gap c and nailed to the purlin k, and a draining plate m provided with a ventilation hole is mounted thereon to cover the gap c and fix the draining plate. The engagement piece n formed at the eaves-side end of the drainer is engaged with the engagement piece n formed at the eaves-side end of the metal fitting j.

The third is a ridge ventilation structure described in Japanese Utility Model Laid-Open Publication No. 61-141415. As shown in FIG. 11, a butt portion of a roof base material a and a roofing material b in the ridge is directed in the ridge direction. A gap c is provided along the gap, the gap c is covered with a drain board r, and a vent s is protruded above the drain board r, and a ridge tile t is laid above the drain board r. The cylindrical ventilation port v to which the eye plate u is attached is formed by shifting the position of the ventilation port s in the ridge direction from the ventilation port s.

[0007]

However, according to the first building ventilation structure, the building covering member h made of an iron plate or the like is used.
Since the ridge portion is finished, the ridge tile cannot be attached to the ridge portion, and the appearance is restricted when the roof is to be tiled. In addition, since the ridge portion is formed by superimposing the mounting portion e of the ridge covering member h on the roofing material a formed in a flat shape, a roofing material having an uneven surface such as a corrugated tile is used. Therefore, there is a problem that it is not possible to prevent rainwater from being blown into the back of the hut from the concave portion on the surface of the roofing material.

Further, according to the second building ventilation structure, the air in the back of the hut is exhausted through the ventilation holes formed in the drain board m. The form and mounting structure of the ventilation holes are concrete. Not explicitly specified. Therefore, sufficient ventilation may not be obtained, or rainwater blown into the roof tile t may enter the inside of the cabin from the ventilation opening. Further, since the means for attaching the ridge roof tile t to the upper part of the draining board m is not specified, similarly to the first ridge ventilation structure, when the roof is to be tiled, there is a restriction on the appearance. Also, when applying this ridge ventilation structure to a roofing material having an uneven surface such as a corrugated tile, means for preventing rainwater from entering the inside of the cabin from the concave portion of the surface of the roofing material. Is also unknown.

Further, according to the third building ventilation structure, the air in the back of the hut is filled with the ventilation holes s protruding above the drain plate r.
And exhaust through the cylindrical ventilation port v formed in the roof tile t, it is difficult to obtain a sufficient ventilation volume.
In addition, the shapes of the ventilation port s and the ventilation port v are complicated, and there is a possibility that component costs and construction costs may be high. In addition, the building tile
Since the ventilating opening v is opened at the top of the roof, there is a possibility that a considerable amount of rainwater may enter at least on the drain plate r, and it is ensured that the rainwater drops to the back of the shed via the vent s. It is also difficult to prevent.

The present invention has been made in order to solve these problems, and it is possible to obtain a sufficient amount of ventilation and to apply the invention to a roofing material having an uneven surface such as a corrugated tile. It is an object of the present invention to provide a ridge ventilation structure which can prevent rainwater from entering the back of the hut even if the ridge roof is installed, and which does not cause any inconvenience to the installation of the ridge roof tile.

In addition, another object of the present invention is to provide a ridge ventilation apparatus provided with the ridge ventilation structure and having excellent workability and ventilation performance.

[0012]

According to a first aspect of the present invention, there is provided a building ventilation structure, wherein a gap is formed over substantially the entire length of a ridge at a butt portion of a roof base material in the ridge, and the space extends vertically along the ridge. Opening, a water return piece is formed outside the upper edge, and a ventilation tube having a fixed piece provided outside the lower edge, the fixed piece is superimposed on the upper surface of the ridge side edge of the roof base material. The ventilation tube is installed in a series on the gap, the upper part of the ventilation tube is formed in a substantially mountain-shaped or substantially arc-shaped cross section, and a pair of droops respectively extending downward from both side edges of the upper surface plate. With a lid comprising a piece, a gap is provided between the ventilation pipe and the ventilation pipe to cover it, and a roofing material is further laid on the fixed piece, near the edge of the roofing material on the ridge side. By attaching a hood and attaching the ridge covering material to the hood and covering the lid, the sky inside the hut Rises inside the ventilation tube, is guided outward along the inner surface of the lid, turns outward downward, flows out of the lid, and discharges outside through the gap formed between the ridge covering material and the cap. It is characterized by being done.

That is, in the present invention, a sufficient ventilation volume is ensured by providing a gap for exhausting the air inside the cabin to the outside over substantially the entire length of the building. In addition, with the structure of installing a ventilation tube with a water return piece on the roof base material, covering a lid with a hanging piece on top of it, and covering it with a ridge covering material attached to a cap
The building covering material can be easily attached,
It is said that it will exhibit the perfect drainage performance against rainwater that blows into the inside of the building covering material.

The roof finishing material according to the present invention includes not only general roof tiles but also metal plates and singles for roofing, but the shape and material are not particularly limited. The ridge covering material includes ridge roof tiles and other similar metal ridge covers, but is not particularly limited in its shape or material.

Further, the ridge ventilation structure according to claim 2 is
The cap is characterized in that it is attached via a ridge door that matches the surface shape of the roofing material.

Accordingly, even when the roof is laid with a roofing material having a surface having irregularities, such as a corrugated tile, the ridge door can seal the space between the roofing material and the coping. It is possible to prevent rainwater from entering the back.

A ridge ventilation device according to a third aspect of the present invention provides a pair of upright plates standing upright on both sides of the ridge center along the ridge and facing each other at a predetermined interval across the ridge center, and a lower edge of each of these upright plates. From the upper edge of each upright plate, and water return pieces extending diagonally outward and downward from the upper edge of each upright plate. And a connecting member for connecting in the orthogonal direction, wherein the fixed piece is superimposed on the upper surface of the ridge side edge of the roof base material laid and provided with a gap at the abutting portion in the building, and ventilation provided above the gap. A cylinder, and a top plate formed in a substantially mountain-shaped or substantially arc-shaped cross section,
A pair of hanging pieces extending downward from both side edges of the upper surface plate, and a lid that is provided on the upper part of the ventilation cylinder by providing a gap between the ventilation cylinder and the ventilation body. Features.

Since the ventilation tube is installed with the fixing piece superimposed on the roof base material, it is possible to drain rainwater that wets the outside of the upright plate from the upper surface of the fixing piece to the upper surface of the roof base material. it can. In addition, since a water return piece extends on the upper edge of the upright plate and a hanging piece also extends on the lid, rainwater that blows into the ridge covering material flows back inside the ventilation cylinder and returns to the hut. It is possible to prevent infiltration and dripping on the back.

Furthermore, the ridge ventilation device according to claim 4 is
The hanging piece of the lid is formed so that its lower edge is located lower than the lower edge of the water return piece of the ventilation tube.

According to this, it is possible to more reliably prevent rainwater blown into the ridge covering material from flowing back inside the ventilation tube and entering and dripping into the back of the cabin.

According to a fifth aspect of the present invention, a roofing material is laid on the fixing piece of the ventilation tube, and a ridge covering material is fixed near an edge of the roofing material on the ridge side. In a state in which the cap is attached, the hanging piece of the lid is formed so that the lower edge thereof is positioned lower than the upper edge of the cap.

[0022] In this manner as well, it is possible to more reliably prevent rainwater blown into the ridge covering material from flowing back inside the ventilation tube and entering and dripping into the back of the cabin, as described above.

[0023]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows the overall structure of a ridge ventilation structure according to the present invention. The upper oblique side of the hut framed structure is composed of rafters T, joint palm materials, etc.
1 is laid, and a roofing material 12 for waterproofing is further laid on the upper surface thereof to form a roof base material 1.
The roof base material 1 is laid on both sides of the ridge with the ridge as a top, and a gap 2 is formed at the abutting portion of the ridge. The gaps 2 are formed at regular intervals over substantially the entire length of the ridge along the length direction of the ridge orthogonal to the paper surface of FIG.

A ridge ventilation device 3 is installed above the gap 2 so as to straddle the gap 2. This ridge ventilation system 3
Is formed by bending a steel plate or the like that has been subjected to water resistance and rust prevention treatment, and is formed of a ventilation tube 3A forming a lower portion and a lid 3B forming an upper portion.

As shown in FIG. 2, the ventilation tube 3A has a pair of upright plates 31 elongated in the lateral direction arranged along the ridge.
Upright on both sides of the ridge center C with a constant distance between them, and connecting the upright plates 31 in the orthogonal direction of the ridge by connecting members 32 arranged near both ends of each of the upright plates 31, It forms an elongated rectangular cylinder opening in the direction.

As shown in FIG. 3, the connecting member 32 is formed by bending a steel plate into a U-shape in a plan view.
Are sandwiched between the upright plates 31 and are riveted to the upright plates 31. With this connecting member 32, the facing distance between the upright plates 31 is kept constant.

At the lower edge of each upright plate 31, a fixing piece 35 is provided extending outward along the roof slope. The fixing piece 35 is provided continuously over the entire length of the upright plate 31, and further extends outwardly at both ends of the upright plate 31, and the extended portions abut each other in a mountain shape in cross section from both sides.

At the upper edge of each upright plate 31, a water return piece 36 is provided, which extends obliquely outward and downward. The water return pieces 36 are also provided continuously over the entire length of the upright plate 31.

On the other hand, the lid 3B has an upper surface plate 37 having a mountain cross section inclined to both sides at a gradient substantially equal to the roof gradient, and a pair of hanging pieces 38 extending downward from both side edges of the upper surface plate 37, respectively. And The upper surface plate 37 is formed wider than the overhang width of the water return piece 36 of the ventilation tube 3A.

The cover 3B is covered with the ventilation tube 3A so as to cover the upper opening of the ventilation tube 3A, and is integrated with the ventilation tube 3A with a spacer 39 interposed between the upright plate 31 and the hanging piece 38. It is fixed to. The spacer 39 is formed, for example, by bending a steel plate into a small rectangular tube shape. Thereby, a gap 4 is formed between the upper part of the ventilation tube 3A and the inner surface of the lid 3B at regular intervals in the vertical and lateral directions. At this time, the hanging piece 38
Is formed so that its lower edge is located below the lower edge of the water return piece 36.

The ridge ventilation device 3 is provided so as to straddle the ridge 2 on the ridge side upper surface of the roof base material 1 laid on both sides of the ridge with the gap 2 provided. Then, the fixing piece 35 is fixed to the roof base material 1 by nailing the fixing piece 35 to the roof base material 1 using a screw nail N1 (see FIG. 4) or the like.

On the roof base material 1, a roofing material 5 such as a roof tile is laid. The illustrated roofing material 5 is a corrugated tile having semi-cylindrical undulations 51 formed at regular intervals on the surface, and a small rising portion 52 for returning water is formed at the upper edge thereof. The roofing material 5 is laid so as to overlap the fixing piece 35 of the ridge ventilation device 3.

Further, this ridge portion is covered by attaching a ridge surface door 6 and a skirting 7 near the edge of the roofing material 5 along the ridge, and attaching a ridge covering material 8 to the skirting 7. . As shown in FIG. 8, the ridge door 6 is a member having a lower surface formed with a concave portion 61 corresponding to the undulations 51 on the surface of the roofing material 5 so as to be in close contact with the surface of the roofing material 5. . By attaching the cover 7 via the ridge door 6, the watertightness between the cover 7 and the roofing material 5 is ensured. The coping 7 and the ridge door 6 are nailed to the roof base material 1 together with the roofing material 5 using a ring nail N2 or the like.

The ridge covering material 8 is put on the top of the ridge so as to straddle the ridge ventilation device 3 and the caps 7 on both sides, and is attached to the cap 7 using a stainless steel cap nail N3 or the like. The illustrated ridge covering material 8 is a ridge roof tile having a substantially semi-cylindrical shape, and ribs 81 orthogonal to the ridge length direction are formed at regular intervals on the lower surface thereof. For this reason, a gap 9 corresponding to the height of the rib 81 is formed between the ridge covering material 8 and the coping 7 over substantially the entire length of the ridge.

The ventilation action and drainage action by the ridge ventilation structure thus configured are as follows.

That is, the air in the back of the hut rises in the ventilation tube 3A through the gap 2 formed in the butt portion of the roof base material 1 in the building, and is guided outside along the inner surface of the lid 3B. Flip downward. And ventilation tube 3
A flows out of the ridge ventilation device 3 through the gap 4 formed between the A and the lid 3B, and is further discharged outside through the gap 9 formed between the capping 7 and the ridge covering material 8. Is done. Since the ventilation tube 3A and the gaps 2, 4, and 9 are provided over substantially the entire length of the building, a sufficient amount of ventilation can be obtained.

With respect to specific values of such ventilation, for example, in the illustrated embodiment, the facing distance between the upright plates 31 is about 20 mm, the width of the water return pieces 36 is about 5 mm,
The width of B is set to about 50 mm, the width of the hanging piece 38 is set to about 20 mm, and the narrowest portion 8 to 1 is set between the ventilation tube 3A and the lid 3B.
When a gap 4 of about 0 mm is provided, 1
An effective ventilation area of 60 to 200 square cm can be secured.

On the other hand, with regard to drainage, most of the rainwater that wets the ridge is blocked by the shade 7 and the ridge door 6 and flows down on the surface of the roofing material 5.
Rainwater may enter from the gap 9 formed between the cap 7 and the ridge covering material 8 to the inside of the ridge covering material 8. In this case, the hanging piece 38 of the lid 3B covered on the upper part of the ventilation tube 3A prevents the blowing of rainwater into the ventilation tube 3A. This hanging piece 38 hangs down to a position below the water return piece 36 extending from the upper edge of the upright plate 31, and FIG.
As shown in the above, by hanging down to a position lower than the upper edge of the coping 7, rainwater blown over the upper side of the coping 7 is prevented from reaching the upper opening of the ventilation tube 3 </ b> A,
It works to drop rainwater on the surface of the roofing material 5 or the roof base material 1.

When the weather is more severe, the hanging piece 38
The rainwater blown to the lower side wets the outer surface of the upright plate 31, and the ventilation tube 3 rises up the outer surface of the upright plate 31 with the wind.
There is also a risk of infiltration into A. On the other hand, a water return piece 36 extending obliquely outward and downward at the upper edge of the upright plate 31 is provided.
Works to stop the rise of rainwater and to allow the rainwater to drop from the lower edge of the water return piece 36 onto the surface of the roof base material 1.

As described above, the ridge ventilation structure of the present invention is capable of almost completely preventing rainwater from being blown into the back of the hut by providing multiple return / drainage means.

Next, the procedure for constructing this building ventilation structure will be described with reference to FIGS. Each of these figures shows only one side of the ridge for convenience of illustration.

First, as shown in FIG. 4, a butt portion of the roof base material 1 is cut out along the ridge, and a gap 2 is formed in the ridge portion.
To form Alternatively, the roof base material 1 may be laid in a state where the gap 2 is provided in the abutting portion in advance. Then, the ridge ventilation device 3 is installed on the gap 2, and the fixing piece 35 is nailed to the roof base material 1 using a screw nail N1 or the like.

Next, as shown in FIG.
A roofing material 5 such as a roof tile,
Is laid up so as to overlap the fixing piece 35 of the ridge ventilation device 3.

Next, as shown in FIG. 6, the ridge door 6 is arranged on the roofing material 5 along the ridge, and the lower surface of the ridge door 6 is made to conform to the undulations 51 on the surface of the roofing material 5. . further,
A cap 7 is placed on the ridge door 6 and is attached to the roof base material 1 using a ring nail N2 or the like. The ridge side door 6 and the Kasagi 7 are also installed over the entire length of the ridge.

Then, as shown in FIG. 7, a ridge covering material 8 such as a ridge roof tile is put on the ridge portion, and the ridge portion is continuously arranged while overlapping in the ridge direction. .
Waterproofing is applied to the joints of the building covering members by sealing them as necessary.

As described above, the ridge ventilation structure of the present invention provides ventilation by a simple operation of nailing the ridge ventilation device 3 in which the ventilation tube 3A and the lid 3B are integrally formed in advance. The air communication part can be secured. In addition, except for the work of attaching the ridge ventilation device 3, the work can be performed without largely changing from a general roof construction procedure, and particularly, complicated on-site processing is not required.
Furthermore, the installation of the ridge ventilation device 3 does not complicate the water-proofing and does not require any special waterproofing treatment. Therefore, the construction can be performed easily and quickly, which greatly contributes to the improvement of the workability in the roof construction.

By the way, the ridge ventilation device 3 of the present invention is installed over substantially the entire length of the ridge, and the ridge director naturally differs depending on each house. In order to install the devices 3, ridge ventilation devices 3 of different lengths are prepared in advance, and a plurality of them are connected and installed as appropriate. Therefore, ridge ventilation device 3
It is reasonable to prepare several types of standard lengths such as 45 cm, 90 cm, 180 cm, or 50 cm, 1 m, 2 m, etc., corresponding to the basic module of the building. And about the ridge ventilation apparatus 3 which set length long, it is preferable to aim at structural stability by increasing the attachment position of the connection member 32 and the spacer 39 suitably.

The connecting member 32 of the ventilation tube 3A is not limited to the one shown in the above-mentioned embodiment. For example, a plate orthogonal to the upright plate 31 is formed integrally with an end of the upright plate 31. And the like.

The upper plate 37 of the lid 3B is also
The cross-sectional shape is not limited to the mountain shape, and may be, for example, an arc shape bulging upward.

The slope of the fixing piece 35 extending from the lower edge of the ventilation tube 3A corresponds to the roof slope, but the range of the roof slope is not particularly limited.

Further, in the above-described embodiment, the roof is tiled, but the present invention is not limited to tiled roofing but can be applied to other roofing materials 5 such as metal plates and singles. When another roofing material 5 is used, the shape, material, and the like of the ridge-side door 6 and the ridge covering material 8 are appropriately selected.

[0053]

According to the ridge ventilation structure of the present invention, it is possible to provide a gap for discharging the air in the back of the hut to the outside over substantially the entire length of the ridge, so that a sufficient amount of ventilation can be obtained. Become. In addition, since a ridge covering material such as a ridge tile can be attached to a tiled roof, there is no unnatural feeling in appearance. In addition, even when a roof is laid with a roofing material having an uneven surface such as a corrugated tile, it can be carried out without inconvenience by using a ridge door.

Further, by the water return / drainage action of the ventilation tube and the lid, it is possible to prevent rainwater blown into the ridge covering material from flowing back inside the ventilation tube and entering / dropping into the back of the cabin. .

In this way, it is possible to prevent damage to the house due to dew condensation or rainwater intrusion, and it is possible to secure good habitability.

Further, according to the ridge ventilation device of the present invention, the ridge ventilation structure can be easily and reliably implemented, and the workability of roof construction can be improved.

[Brief description of the drawings]

FIG. 1 is a sectional view of a ridge part showing an embodiment of a ridge ventilation structure according to the present invention.

FIG. 2 is a perspective view showing a configuration of a ridge ventilation device according to the present invention.

FIG. 3 is a perspective view of a connecting member of the ridge ventilation device.

FIG. 4 is a first partial perspective view showing a construction procedure of the ridge ventilation structure.

FIG. 5 is a second partial perspective view showing a construction procedure of the ridge ventilation structure.

FIG. 6 is a third partial perspective view showing a construction procedure of the ridge ventilation structure.

FIG. 7 is a fourth partial perspective view showing a construction procedure of the ridge ventilation structure.

FIG. 8 is a partial side view of a ridge-side door used for the ridge ventilation structure.

FIG. 9 is a cross-sectional perspective view of a ridge portion showing a first example of a ridge ventilation structure according to the related art.

FIG. 10 is a sectional view of a ridge portion showing a second example of a ridge ventilation structure according to the related art.

FIG. 11 is a sectional view of a ridge part showing a third example of a ridge ventilation structure according to the related art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Roof base material 2 Air gap 3 Building ventilation system 3A ventilation tube 3B Lid 31 Upright board 32 Connecting member 35 Fixing piece 36 Water return piece 37 Top plate 38 Hanging piece 4 Air gap 5 Roofing material 6 Building door 7 Kasagi 8 building Material 9 Gap C ridge

Claims (5)

[Claims] 1. A gap is formed over a substantially entire length of a ridge at an abutting portion of a roof base material in the ridge, and is vertically opened along the ridge, and a water return piece is formed outside an upper edge portion, and a lower edge is formed. A ventilation tube having a fixing piece provided on the outside thereof, the fixing piece is superimposed on the upper surface of the ridge side edge of the roof base material, and the fixing piece is superimposed and installed in a series on the gap. An air gap is formed between the ventilation tube and the lid by providing a top plate having a substantially mountain-shaped or substantially arc-shaped cross section and a pair of hanging pieces extending downward from both side edges of the top plate. A roofing material is laid on the fixed piece, and a cap is attached near the ridge side edge of the roofing material. The air inside the cabin rises inside the ventilation tube and is guided along the inner surface of the lid. Ridge ventilation structure flows to the outside of the lid inverted outwardly downwardly, characterized in that it is discharged from the space formed between the ridge covering material and coping outdoors. 2. The shelter is attached via a ridge door conforming to the surface shape of the roofing material.
Building ventilation structure described in. 3. A pair of upright plates standing upright on both sides of the ridge center along the ridge and opposed at predetermined intervals across the ridge center, and each extending outward from the lower edge of each of the upright plates along the roof slope. A fixed piece provided, a water return piece extending diagonally outward and diagonally downward from the upper edge of each upright plate, and a connecting member for connecting each upright plate in a plurality of locations in a direction orthogonal to the ridge, A ventilation tube installed on top of the gap by superimposing the fixing piece on the upper surface of the ridge side edge of the roof base material laid with a gap at the abutting portion in the building, and having a substantially mountain-shaped or substantially arc-shaped cross section The formed top plate, comprising a pair of hanging pieces respectively extending downward from both side edges of the top plate, a lid provided over the ventilation tube by providing a gap between the ventilation tube and A ridge ventilation device characterized by comprising: 4. The ridge ventilation device according to claim 3, wherein the hanging piece of the lid is formed such that a lower edge thereof is located below a lower edge of a water return piece of the ventilation tube. . 5. In a state in which a roofing material is laid on a fixing piece of a ventilation tube, and a cap for fixing a ridge covering material is added near a ridge side edge of the roofing material, 5. The ridge ventilation device according to claim 3, wherein the hanging piece of the lid is formed such that a lower edge thereof is positioned lower than an upper edge of the coping. 6.