JP6991032B2 - Ventilation structure at the corner of the hipped roof - Google Patents

Ventilation structure at the corner of the hipped roof Download PDF

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JP6991032B2
JP6991032B2 JP2017193371A JP2017193371A JP6991032B2 JP 6991032 B2 JP6991032 B2 JP 6991032B2 JP 2017193371 A JP2017193371 A JP 2017193371A JP 2017193371 A JP2017193371 A JP 2017193371A JP 6991032 B2 JP6991032 B2 JP 6991032B2
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容 林
慶人 神
剛大 木村
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日本住環境株式会社
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Description

本発明は、寄棟屋根の隅棟部の換気構造に関するものである。 The present invention relates to a ventilation structure at a corner of a hipped roof.

棟の四方に流れる４つの斜面で形成される屋根である寄棟屋根は、近時、日照権等による法規制の関係から、一般住宅のみならず、アパート等にも採用されることが多くなってきている。この寄棟屋根の場合、切妻屋根に比べて棟換気部が短くなるため、その隅棟部においても換気を行うことが要請される。その他の隅棟部を有する屋根についても同様である。 The hipped roof, which is a roof formed by four slopes flowing on all sides of the building, has recently been adopted not only for general houses but also for apartments, etc. due to legal restrictions such as the right to sunshine. It's coming. In the case of this hipped roof, the ridge ventilation section is shorter than that of the gable roof, so it is required to ventilate the corner ridge section as well. The same applies to roofs with other corner ridges.

隅木と垂木の上端が同一仕上げ面になっている寄棟における隅棟部の一般的な収まり構造において、屋根断熱の場合は、各通気経路（垂木４，４間）が独立していて、通気の出口が塞がった状態の場合が多い（図６参照）。また、平棟長さが短い場合は、棟部に十分な換気用開口を設けることができないため、隅棟部に躯体開口して換気材を設置する必要性が生ずる。しかし、その現場施工は容易ではなく、大変な作業となる。 In the general fitting structure of the corner ridge in a hipped roof where the upper ends of the corners and rafters are the same finished surface, in the case of roof insulation, each ventilation path (between the rafters 4 and 4) is independent and ventilation. In many cases, the exit of is blocked (see FIG. 6). Further, when the flat ridge length is short, it is not possible to provide a sufficient ventilation opening in the ridge portion, so that it becomes necessary to open the skeleton in the corner ridge portion and install a ventilation material. However, the on-site construction is not easy and it is a difficult task.

特開平１０－２３８０４７号公報Japanese Unexamined Patent Publication No. 10-238047 特開２０１７－４０１０５号公報Japanese Unexamined Patent Publication No. 2017-40105

上述したように、寄棟屋根の場合、切妻屋根に比べて棟換気部が短くなるため、隅棟部においても換気を行う必要性が生ずるが、従来、隅棟部についての好適な換気構造は提供されていない。 As mentioned above, in the case of a hipped roof, the ventilation section of the ridge is shorter than that of the gable roof, so it is necessary to ventilate the corner ridge as well. Not provided.

そこで本発明は、施工が容易で、隅棟部における良好な通気環境を実現し得る寄棟屋根の隅棟部の換気構造を提供することを課題とする。 Therefore, it is an object of the present invention to provide a ventilation structure for a corner ridge of a hipped roof, which is easy to construct and can realize a good ventilation environment in the corner ridge.

上記課題を解決するための請求項１に係る発明は、隅木の上面において野地板が前記隅木の幅以上にオフセットされ、前記隅木の上面の前記野地板間に隅木通気材が配置され、垂木間の空気が前記隅木通気材を通って排気可能であり、
前記隅木通気材は、プラスチック製プレートに、先端部を平坦にした円錐体を密に設けた通気プレートを２枚、前記円錐体の頂面同士を当接させて貼り合わせて成る原材を帯状に裁断し、幅方向一側面が斜面にカットされて逆台形状にされたものであることを特徴とする寄棟屋根の隅棟部の換気構造である。 In the invention according to claim 1 for solving the above-mentioned problems, the field board is offset to the width of the corner tree or more on the upper surface of the corner tree, the corner tree ventilation material is arranged between the field boards on the upper surface of the corner tree, and the rafters are separated. Air can be exhausted through the rafter ventilator,
The corner wood ventilation material is a strip of raw material made by sticking two ventilation plates densely provided with a cone with a flat tip on a plastic plate, and the top surfaces of the cones are brought into contact with each other. It is a ventilation structure of a corner ridge of a hipped roof, which is characterized by being cut into an inverted trapezoidal shape by cutting one side surface in the width direction into a slope .

一実施形態においては、前記隅木通気材は前記隅木の水下から水上にかけて設置され、前記隅木通気材を通り抜けた空気は、その水上の前記野地板間の空間を抜けて、棟通気部の通気路内に流入して大気に放出される。 In one embodiment, the corner tree ventilation material is installed from under the water to the water of the corner tree, and the air passing through the corner tree ventilation material passes through the space between the field boards on the water to ventilate the building ventilation portion. It flows into the road and is released into the atmosphere.

他の実施形態においては、前記隅木通気材の上側の屋根材の端面間が隔てられて開口され、その開口部を覆うように換気装置が配置され、前記隅木通気材を通り抜けた空気は、前記開口部から前記換気装置内に流入して大気に放出される。 In another embodiment, the roofing material on the upper side of the corner wood ventilator is opened so as to be separated from each other, and a ventilation device is arranged so as to cover the opening, and the air passing through the corner wood ventilator is the air passing through the corner wood ventilator. It flows into the ventilation device through the opening and is released into the atmosphere.

本発明に係る寄棟屋根の隅棟部の換気構造は上記構成であるため、施工容易で、屋根断熱及び天井断熱のいずれの場合においても、隅棟部における良好な通気環境を実現し得る効果がある。 Since the ventilation structure of the corner ridge of the hipped roof according to the present invention has the above configuration, it is easy to construct and has an effect of realizing a good ventilation environment in the corner ridge in both roof insulation and ceiling insulation. There is.

本発明に係る寄棟屋根の隅棟部の換気構造の第１の実施形態の縦断面図である。It is a vertical sectional view of the 1st Embodiment of the ventilation structure of the corner ridge part of the hipped roof which concerns on this invention. 本発明に係る寄棟屋根の隅棟部の換気構造の第１の実施形態の横断面図である。It is sectional drawing of the 1st Embodiment of the ventilation structure of the corner ridge part of the hipped roof which concerns on this invention. 本発明に係る寄棟屋根の隅棟部の換気構造に用いられる隅木換気材の構成例を示す図である。It is a figure which shows the structural example of the corner tree ventilation material used for the ventilation structure of the corner ridge part of the hipped roof which concerns on this invention. 本発明に係る寄棟屋根の隅棟部の換気構造の第２の実施形態の縦断面図である。It is a vertical sectional view of the 2nd Embodiment of the ventilation structure of the corner ridge part of the hipped roof which concerns on this invention. 本発明に係る寄棟屋根の隅棟部の換気構造の第２の実施形態の施工状態を示す斜視図である。It is a perspective view which shows the construction state of the 2nd Embodiment of the ventilation structure of the corner ridge part of the hipped roof which concerns on this invention. 従来の隅棟部の構造図である。It is a structural drawing of a conventional corner ridge.

本発明を実施するための形態につき、添付図面を参照しつつ詳細に説明する。図１，２は、本発明に係る寄棟屋根の隅棟部の換気構造の第１の実施形態の収まり例を示すもので、そこには、屋根断熱の場合が示されている。その換気構造は、隅木１の上面において野地板２，２が隅木１の幅以上にオフセットされ、隅木１の上面の野地板２，２間に隅木通気材３，３が配置され、垂木４，４間の空気が隅木通気材３，３を経て大気に放出可能にされる。垂木４，４間には、隅木１に突き当たるようにして、屋根断熱のための断熱材６，６が施工されている。また、野地板２，２及び隅木通気材３，３の上にルーフィング（図示してない）を介して屋根材７，７が配置され、その継ぎ目を被覆するように棟包８が設置される。 The embodiment for carrying out the present invention will be described in detail with reference to the accompanying drawings. FIGS. 1 and 2 show an example of fitting the first embodiment of the ventilation structure of the corner ridge portion of the hipped roof according to the present invention, and shows the case of roof insulation. In the ventilation structure, the field boards 2 and 2 are offset to the width of the corner tree 1 or more on the upper surface of the corner tree 1, and the corner tree ventilation materials 3 and 3 are arranged between the field boards 2 and 2 on the upper surface of the corner tree 1. The air between 4 can be released to the atmosphere through the rafter ventilators 3 and 3. Insulating materials 6 and 6 for roof insulation are installed between the rafters 4 and 4 so as to abut against the corner timber 1. Further, roofing materials 7 and 7 are arranged on the field boards 2 and 2 and corner wood ventilation materials 3 and 3 via roofing (not shown), and the ridge package 8 is installed so as to cover the seams. ..

隅木通気材３，３は、例えば、プラスチック製プレート、即ち、例えば厚さ０．１～０．３ｍｍ程のポリプロピレン等製の薄手のプレートに、エンボス加工等によって、先端部を平坦にした高さ５～１０ｍｍ程の円錐体３ａを密に設けた通気プレートを設け、その通気プレートを２枚、その円錐体３ａの頂面同士を当接させて貼り合わせて成る原材を、帯状に裁断して形成される（図３参照）。そして、幅方向一側面が斜面３ｂにカットされて逆台形状にされ、上面に両面テープ３ｃが、幅方向に延出するように張着される。 The corner wood ventilators 3 and 3 have a height of, for example, a plastic plate, that is, a thin plate made of polypropylene or the like having a thickness of about 0.1 to 0.3 mm, and the tip thereof is flattened by embossing or the like. A ventilation plate with a cone 3a of about 5 to 10 mm densely provided is provided, and two ventilation plates are cut into a strip shape from the raw material formed by abutting the top surfaces of the cone 3a against each other and pasting them together. (See FIG. 3). Then, one side surface in the width direction is cut into a slope 3b to form an inverted trapezoidal shape, and the double-sided tape 3c is attached to the upper surface so as to extend in the width direction.

かかる構成の隅木通気材３，３は、圧潰力に対してかなりの抵抗力を示す通気プレートを、その円錐体３ａ同士が向かい合うようにして貼り合わせて構成されるため、より一層強度を有するものとなる。また、その構成の場合、突合された円錐体３ａ間に、通気路となるのに十分な広さの菱形の間隙が確実に形成保持されるので、強度と通気性とを併せ有するものとなり、ここで用いる通気材として好適である。 The corner wood ventilators 3 and 3 having such a configuration have further strength because they are configured by laminating ventilation plates showing considerable resistance to crushing force so that their cones 3a face each other. Will be. Further, in the case of the configuration, a rhombic gap having a sufficient width to serve as a ventilation path is surely formed and maintained between the butt cones 3a, so that the strength and the breathability are combined. It is suitable as a ventilation material used here.

野地板２，２は、隅木１の上面において隅木１の幅以上にオフセットされ、そこに一対の隅木通気材３，３の配置スペースが生成される。一対の隅木通気材３，３はそれぞれ、隅木１の上面傾斜面に、その底面の端部を隅木１の上面傾斜面の端部に合わせて載置し、両面テープ３ｃを野地板２，２上に接着して固定する（図１参照）。その状態において、斜面３ｂと野地板２，２の端面との間に通気空間５，５が生成され、垂木４，４間の空気は、この通気空間５，５から隅木通気材３，３内に流入する。 The field boards 2 and 2 are offset on the upper surface of the corner tree 1 to be equal to or larger than the width of the corner tree 1, and a space for arranging the pair of corner tree ventilation materials 3 and 3 is generated there. Each of the pair of corner wood ventilators 3 and 3 is placed on the upper surface inclined surface of the corner tree 1 with the end of the bottom surface aligned with the end of the upper surface inclined surface of the corner tree 1, and the double-sided tape 3c is placed on the field board 2 and 2. Adhere and fix on top (see Figure 1). In that state, ventilation spaces 5 and 5 are generated between the slope 3b and the end faces of the field boards 2 and 2, and the air between the rafters 4 and 4 is introduced from the ventilation spaces 5 and 5 into the corner wood ventilation materials 3 and 3. Inflow to.

この第１の実施形態の場合、通気空間５，５から隅木通気材３，３内に流入した空気は、隅木通気材３，３を幅方向に通流して隅木通気材３，３間の通気路９に抜け、そこを水上側に移動する（図２参照）。そして、隅木通気材３，３を長さ方向に通り抜けた空気は、更に水上側の野地板２，２間のスリット１０内を棟に向かって上昇し、棟部の野地板２，２間のスリット１０ａ内に流入し、棟部換気装置を経て大気に放出される。棟部換気装置は特に限定されるものではなく、任意の構成のものを用いることができる。 In the case of the first embodiment, the air flowing into the corner tree ventilation materials 3 and 3 from the ventilation spaces 5 and 5 passes through the corner wood ventilation materials 3 and 3 in the width direction to ventilate between the corner wood ventilation materials 3 and 3. Exit to Road 9 and move to the upper side of the water (see FIG. 2). Then, the air that has passed through the corner wood ventilators 3 and 3 in the length direction further rises toward the ridge in the slit 10 between the field plates 2 and 2 on the water side, and between the field plates 2 and 2 in the ridge. It flows into the slit 10a and is released into the atmosphere through the ridge ventilation device. The ridge ventilation system is not particularly limited, and any configuration can be used.

図４は、本発明に係る寄棟屋根の隅棟部の換気構造の第２の実施形態の収まり例を示すものである。ここに図示された例は、天井断熱の場合のものである。この場合の換気構造は、隅木１の上面において野地板２，２が隅木１の幅以上にオフセットされ、隅木１の上面の野地板２，２間に隅木通気材３，３が配置され、垂木４，４間の空気が隅木通気材３，３を経て大気に放出可能にされる点は、第１の実施形態と同じである。 FIG. 4 shows an example of fitting the second embodiment of the ventilation structure of the corner ridge portion of the hipped roof according to the present invention. The example illustrated here is for ceiling insulation. In this case, the ventilation structure is such that the field boards 2 and 2 are offset to the width of the corner tree 1 or more on the upper surface of the corner tree 1, and the corner tree ventilation materials 3 and 3 are arranged between the field boards 2 and 2 on the upper surface of the corner tree 1. It is the same as the first embodiment in that the air between 4 and 4 can be released to the atmosphere through the rafter ventilators 3 and 3.

この第２の実施形態の場合は、隅木通気材３，３の上側の屋根材７，７の端面間が大きく隔てられることによって開口部１７が設けられ、その開口部１７を覆うように換気装置１１が配置される。図示した例における換気装置１１は、山形に形成される、通例、金属製のカバー材１２と、カバー材１２内に配備される一対の通気部材１４，１４から成る。カバー材１２の山形形状の角度は、本装置が設置される隅棟部の野地板２，２（屋根材７，７）のなす角度に対応するように、予め、あるいは、現場において設定される。 In the case of the second embodiment, the opening 17 is provided by greatly separating the end faces of the roofing materials 7 and 7 on the upper side of the corner wood ventilation materials 3 and 3, and the ventilation device covers the opening 17. 11 is arranged. The ventilation device 11 in the illustrated example is usually composed of a metal cover material 12 formed in a chevron shape and a pair of ventilation members 14, 14 arranged in the cover material 12. The angle of the chevron shape of the cover material 12 is set in advance or in the field so as to correspond to the angle formed by the field boards 2 and 2 (roofing materials 7 and 7) in the corner ridge where the apparatus is installed. ..

通気部材１４，１４は、幅方向（図において左右方向）に通気する多数の通気路を有するもので、通例、幅方向に抜ける通気路を並設したプラスチック板を多数段積層し、熱線で溶断して所定幅にすると共に一体化する公知の方法により製造することができる（特許第２６１０３４２号公報等参照）。 カバー材１２の両端は直角に折曲され、そこに桟木２１が収まり、カバー材１２の上から桟木２１を通して屋根材７，７にくぎ留めされる。また、カバー材１２の両傾斜面の中間部に、長さ方向に延びる通気開口１３が形成される。通気開口１３は一連のものであってもよいが、通例、図５に示されるように、長尺の開口を適宜間隔置きに開設したものとされる。 The ventilation members 14 and 14 have a large number of ventilation passages for ventilation in the width direction (left-right direction in the figure), and are usually made by stacking a large number of plastic plates in which ventilation passages exiting in the width direction are arranged side by side and fusing with heat rays. It can be manufactured by a known method of making it into a predetermined width and integrating it (see Patent No. 2610342, etc.). Both ends of the cover material 12 are bent at a right angle, and the crosspiece 21 is fitted therein, and is nailed to the roofing materials 7 and 7 from above the cover material 12 through the crosspiece 21. Further, a ventilation opening 13 extending in the length direction is formed in the middle portion of both inclined surfaces of the cover material 12. The ventilation openings 13 may be a series, but usually, as shown in FIG. 5, long openings are opened at appropriate intervals.

好ましくは、カバー材１２裏面の中央部、即ち、通気部材１４，１４設置部の内側に、長さ方向に延びる結露防止材１５が定着される。結露防止材１５としては、通例、厚さ１～２ｍｍ程度の発泡ポリエチレンシート材が用いられる。また、好ましくは、換気装置１１の空間部内に立ち上がる水切り２２が、隅木通気材３，３と屋根材７，７の間に挟持されて配設される。 Preferably, the dew condensation prevention material 15 extending in the length direction is fixed to the central portion of the back surface of the cover material 12, that is, the inside of the ventilation members 14, 14 installation portions. As the dew condensation prevention material 15, a foamed polyethylene sheet material having a thickness of about 1 to 2 mm is usually used. Further, preferably, a drainer 22 that rises in the space of the ventilation device 11 is arranged so as to be sandwiched between the corner wood ventilation materials 3 and 3 and the roof materials 7 and 7.

隅棟の場合は水下側棟包２４を取り付け、その後桟木２１を屋根材７，７から野地板２，２にかけてくぎ留めした後、裏面に通気部材１４，１４と結露防止材１５を固定した換気装置１１を、開口部１７を塞ぐように被装する。その際、カバー材１２の両側の角部内に桟木２１が収まるようにし、また、カバー材１２の水下側端部が、水下側棟包２４上に所定量（例えば７５ｍｍ）オーバーラップするようにする。そして、最後に水上側棟包２３が、その端部がカバー材１２の水上側端部上に所定量（例えば７５ｍｍ）、オーバーラップするように取り付けて施工完了となる（図５参照）。 In the case of a corner ridge, the underwater ridge 24 was attached, and then the stile 21 was nailed from the roofing materials 7 and 7 to the field boards 2 and 2, and then the ventilation members 14 and 14 and the dew condensation prevention material 15 were fixed to the back surface. The ventilation device 11 is covered so as to close the opening 17. At that time, the crosspiece 21 is set to fit in the corners on both sides of the cover material 12, and the underwater end of the cover material 12 overlaps the underwater ridge 24 by a predetermined amount (for example, 75 mm). To. Finally, the water upper ridge package 23 is attached so that the end portion thereof overlaps the water upper end portion of the cover material 12 by a predetermined amount (for example, 75 mm), and the construction is completed (see FIG. 5).

この第２の実施形態の場合、天井断熱のための断熱材（図示してない）と野地板２，２との間に大きな空間が生成される。この空間内の空気は、上記第１の実施形態の場合と同様に、各垂木４，４間から、通気空間５，５を通って隅木通気材３，３内に流入して、開口部１７に流出する。そして、開口部１７内の空気は、通気部材１４，１４を経て通気開口１３から大気に放出される。 In the case of this second embodiment, a large space is generated between the heat insulating material (not shown) for ceiling heat insulation and the field boards 2 and 2. As in the case of the first embodiment, the air in this space flows from between the rafters 4 and 4 through the ventilation spaces 5 and 5 into the corner wood ventilation materials 3 and 3, and the opening 17 Leaked into. Then, the air in the opening 17 is discharged to the atmosphere from the ventilation opening 13 through the ventilation members 14 and 14.

本発明に係る寄棟屋根の隅棟部の換気構造は上記構成であるため、施工容易で、隅棟部における良好な通気環境を実現し得るものであり、その産業上の利用可能性は大である。 Since the ventilation structure of the corner ridge of the hipped roof according to the present invention has the above configuration, it is easy to construct and can realize a good ventilation environment in the corner ridge, and its industrial applicability is great. Is.

１ 隅木
２ 野地板
３ 隅木通気材
４ 垂木
５ 通気空間
６ 断熱材
７ 屋根材
８ 棟包
９ 通気路
１０，１０ａ スリット
１１ 換気装置
１３ 通気開口
１７ 開口部 1 Sumiki
2 Field board
3 Lumber Ventilation Material 4 Rafters 5 Ventilation Space 6 Insulation Material 7 Roof Material 8 Building Package
9 Ventilation channel
10,10a Slit 11 Ventilation device
13 Ventilation opening 17 Opening

Claims (3)

隅木の上面において野地板が前記隅木の幅以上にオフセットされ、前記隅木の上面の前記野地板間に隅木通気材が配置され、垂木間の空気が前記隅木通気材を通って排気可能であり、
前記隅木通気材は、プラスチック製プレートに、先端部を平坦にした円錐体を密に設けた通気プレートを２枚、前記円錐体の頂面同士を当接させて貼り合わせて成る原材を帯状に裁断し、幅方向一側面が斜面にカットされて逆台形状にされたものであることを特徴とする寄棟屋根の隅棟部の換気構造。 On the upper surface of the corner tree, the field board is offset by the width of the corner tree or more, the corner tree ventilation material is arranged between the field boards on the upper surface of the corner tree, and the air between the rafters can be exhausted through the corner tree ventilation material.
The corner wood ventilation material is a strip of raw material made by sticking two ventilation plates densely provided with a cone with a flat tip on a plastic plate, and the top surfaces of the cones are brought into contact with each other. Ventilation structure at the corner of the hipped roof, which is characterized by being cut into an inverted trapezoidal shape by cutting one side in the width direction into a slope . 前記隅木通気材は前記隅木の水下から水上にかけて設置され、前記隅木通気材を通り抜けた空気は、その水上の前記野地板間の空間を抜けて、棟通気部の通気路内に流入して大気に放出される、請求項１に記載の寄棟屋根の隅棟部の換気構造。 The corner tree ventilation material is installed from under the water to the water of the corner tree, and the air that has passed through the corner tree ventilation material passes through the space between the field boards on the water and flows into the ventilation passage of the ridge ventilation portion. The ventilation structure at the corner of the hipped roof according to claim 1, which is released into the air. 前記隅木通気材の上側の屋根材の端面間が隔てられて開口され、その開口部を覆うように換気装置が配置され、前記隅木通気材を通り抜けた空気は、前記開口部から前記換気装置内に流入して大気に放出される、請求項１に記載の寄棟屋根の隅棟部の換気構造。 An opening is separated between the end faces of the roofing material on the upper side of the corner tree ventilation material, a ventilation device is arranged so as to cover the opening, and air passing through the corner tree ventilation material is introduced from the opening into the ventilation device. The ventilation structure of the corner ridge of the hipped roof according to claim 1, which flows into the air and is released into the atmosphere.
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001123608A (en) 1999-10-26 2001-05-08 S X L Corp Attic space ventilating structure
JP2004316270A (en) 2003-04-17 2004-11-11 Ichiro Nakajima Ridge ventilator and ridge ventilating structure using the same
JP2005256370A (en) 2004-03-11 2005-09-22 Tostem Corp Building with heat-insulating ventilation roof
JP2006104767A (en) 2004-10-05 2006-04-20 Nippon Jukankyo Kk Venting material
JP2006348525A (en) 2005-06-14 2006-12-28 Nippon Jukankyo Kk Attic space ventilation device, and tiled roof structure using the same

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10238047A (en) * 1997-02-27 1998-09-08 Kataoka Kawara Kogyo Kk Ridge ventilating device
JP5887452B1 (en) * 2015-08-20 2016-03-16 株式会社ハウゼコ Water return structure and ventilation ridge structure using the same

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001123608A (en) 1999-10-26 2001-05-08 S X L Corp Attic space ventilating structure
JP2004316270A (en) 2003-04-17 2004-11-11 Ichiro Nakajima Ridge ventilator and ridge ventilating structure using the same
JP2005256370A (en) 2004-03-11 2005-09-22 Tostem Corp Building with heat-insulating ventilation roof
JP2006104767A (en) 2004-10-05 2006-04-20 Nippon Jukankyo Kk Venting material
JP2006348525A (en) 2005-06-14 2006-12-28 Nippon Jukankyo Kk Attic space ventilation device, and tiled roof structure using the same

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