JP4456418B2 - Watertight structure of composite roof - Google Patents

Description

The present invention relates to a water-tight structure of a composite roof part that can be used for a roof part of a building and can particularly improve the water-tight performance of a part where roof parts having different shapes are joined.

Conventionally, the joining structure of a roof part as shown in FIG. 10 is known (for example, refer patent document 1 etc.).

First, to explain from the configuration, in this conventional joint structure of roof parts, an inclined roof part 3 having a certain roof gradient is arranged on the upper part of the building 1 and is arranged adjacent to the inclined roof part 3. The composite roof portion 2 is mainly configured by providing the land roof portion 4 extending substantially horizontally.

Among these, the plurality of roof panel members 5 constituting the inclined roof portion 3 are connected in a substantially rectangular shape when viewed from above, and frame members 5a and 5b, which form a peripheral edge, and these frame members 5a. And 5b ...
And a flat panel surface member 5c laid so as to cover the upper surface portion of the main body.

In general, at the joint portion between these roof panel members 5 and the land roof portion 4 arranged adjacent to each other, as shown in FIG. 11, the front end surface 5d of the frame member 5a extending along the joint portion.
Moreover, the back side surface of the upper end part 6a of the rising panel surface material 6 of the flat roof part 4 is joined.

In such a joint portion, in order to prevent rainwater from entering the building 1, a waterproof paper 7 is laid on the upper surface side of the panel surface material 5 c of the roof panel member 5, and a front end of the waterproof paper 7 is provided. An overlapping portion 9 having a fixed width w is formed by overlapping the edge 7a with the upper edge 8a of the waterproof paper 8 attached so as to cover the outer surface of the rising panel surface material 6.

Further, on the upper surface side of the waterproof paper 7 of the inclined roof portion 3, roof finishing materials 10 and 10 made of metal folding plates are fixedly attached with nails 11.

Among these, the upper end bent portion 12a of the vertical surface finishing material 12 stuck on the outer surface side of the rising panel surface material 6 is fitted to the front end folded portion 10a of the roof finishing material 10 on the eaves side. ing.

  Next, the conventional watertight structure of the composite roof portion will be described.

In the conventional watertight structure of the composite roof portion, the roof finishing material 10,
Rainwater that has entered the interior from the connecting portion between the 10 flows down the upper surface of the waterproof paper 7 and passes through the upper surface side of the overlapping portion 9.

And the rainwater which passed the upper surface side of the said superposition | polymerization part 9 is the back surface side of the said vertical surface finishing material 12,
The gap between the waterproof paper 8 and the outer surface flows down.

In addition, a snow melting groove having a substantially flat bottom surface corresponding to a flat roof portion is provided in the vicinity of the eaves, and the snow trapped in the snow melting groove is forcibly melted before it falls below the eaves including the adjacent land. A device provided with a forced snow melting machine or the like is also known (see, for example, Patent Documents 2 and 3).
Japanese Patent Laid-Open No. 11-144102 (FIGS. 1 and 2, paragraphs 0012 to 0027) Japanese Patent Publication No. 8-16404 (FIGS. 1 to 3) Japanese Patent Laid-Open No. 7-279481 (FIGS. 1 to 3, paragraphs 0007 to 0023)

However, in the conventional watertight structure of the composite roof portion as shown in FIG. 11, the overlapping paper 9 is laid on the upper surface side of the panel face material 5 c, and the waterproof paper 7 is outside the rising panel face material 6. It only overlaps the upper edge 8a of the waterproof paper 8 attached so as to cover the side surface.

  For this reason, there was a possibility that water leaked from the overlapping portion 9 to the inside of the building 1 frame.

Moreover, the part by which the upper end bending part 12a of the vertical surface finishing material 12 affixed on the outer surface side of the said rising panel surface material 6 is fitted by the front end folding | returning part 10a of the said roof finishing material 10 by the eaves side. Also, there was a risk of rainwater entering and leaking into the building 1 frame.

Then, this invention makes it a subject to provide the watertight structure of the composite roof part which can acquire a watertight state reliably even if it is a junction part of the composite roof which has a complicated shape.

In order to achieve the above object, according to the first aspect of the present invention, there is provided an inclined roof portion having a certain roof slope at an upper part of a building, and an adjacent to the inclined roof portion. A land roof portion extending substantially horizontally, and a plurality of roof finishing materials joined together to form a watertight structure of a composite roof portion that continuously covers the inclined roof portion and the land roof portion. In addition, at the joint portion between the eaves side of the inclined roof portion and the rising surface portion of the flat roof portion, the housing side roof finishing that is erected substantially vertically inside the roof finishing material provided along the rising surface portion The upper end portion of the material is bent according to the inclination angle of the inclined roof portion to form an extended interposed portion, and the extended interposed portion is waterproofed laid on the upper surface side of the inclined roof portion. By interposing under the edge of the edge of the paper eaves side, the waterproof paper and the front A skeleton side roof coverings, the upper surface side of the inclined roof portion, is characterized in watertight structure of the composite roof having a polymerization unit of polymerizing.

According to a second aspect of the present invention, there is provided a casing-side waterproof paper so as to be doubled on the lower surface side of the waterproof paper laid on the upper surface side of the inclined roof portion, and the casing-side waterproof The watertight structure of the composite roof portion according to claim 1, wherein the edge portion of the paper eaves side is overlapped and superposed on the lower side of the extended interposing portion of the frame side roof finish.

Further, according to a third aspect of the present invention, a watertight member is attached between the upper surface of the edge side edge of the eaves side waterproof paper and the lower surface of the extended interposing part of the roof side roofing material. The watertight structure of the composite roof part according to claim 2 is characterized.

And what was described in Claim 4 is the upper end part of the said roof finishing material provided along this rising surface part, and the eaves edge side edge part of the roof finishing material provided in the eaves side of the said inclined roof part, The joint portion is protruded in the eaves direction toward the upper side of the flat roof portion to be separated from the upper flow path of the waterproof paper laid on the upper surface side of the inclined roof portion, and the joint portion and the extension A flow path in the rising surface part communicating with the flow path of the inclined roof part is formed between the installation part and the flow opening,
The watertight structure of the composite roof part according to any one of claims 1 to 3, which is formed between the housing-side roof finishing material of the rising surface part and the roof finishing material.

According to the first aspect of the present invention configured as described above, the extended interposed portion is interposed under the eaves edge side edge portion of the waterproof paper laid on the upper surface side of the inclined roof portion. Thus, the waterproof paper and the casing side roof finishing material are superposed on the upper surface side of the inclined roof portion.

For this reason, in the inclined roof portion, rainwater that has entered the lower surface side of the roof finishing material from the joints between the roof finishing materials passes through the overlapping portion from the upper surface side of the waterproof paper of the inclined roof portion. Then, it flows down to the outside of the outer side surface of the frame side roof finishing material.

The extended interposing part is integrally formed by bending the upper end part of the housing side roof finishing material erected substantially vertically inside the roof finishing material according to the inclination angle of the inclined roof part. Since it is comprised, compared with what overlapped two waterproof papers like the conventional superposition | polymerization part, while being able to improve durability, a construction error can be reduced.

  Therefore, variation in watertight performance can be reduced.

Further, according to the second aspect of the present invention, in the inclined roof portion, along with the waterproof paper, an eaves edge side end edge portion is overlapped on the lower side of the extended interposing portion of the frame side roof finishing material. The waterproof paper is laid so as to be doubled by the polymerized casing-side waterproof paper.

For this reason, even if rain leaks from the upper waterproof paper or the like,
Infiltration of rainwater into the building frame is prevented.

Furthermore, what is described in claim 3 is that the watertightness attached between the upper surface of the edge side edge of the eaves side waterproof paper and the lower surface of the extended interposing part of the roof side roofing material. Rain water flowing down the upper surface of the housing side waterproof paper by the member, from between the upper surface of the eaves edge side edge portion of the housing side waterproof paper and the lower surface of the extending interposition part of the housing side roofing material, Without entering the building housing, it passes through the upper surface side of the extended interposing part of the housing-side roof finishing material and is drained to the outside of the housing-side roof finishing material.

  For this reason, the stable watertight performance can be exhibited further.

Moreover, since the said junction part is formed spaced apart from the flow path of the upper side of waterproof paper, what was described in Claim 4 rains directly on this junction part, deteriorates, and is waterproof. The possibility of impairing the properties can be reduced.

Furthermore, the rising water formed by the rainwater flowing down through the flow path of the inclined roof portion smoothly between the housing-side roof finishing material of the rising surface portion and the roof finishing material through the flow opening. The possibility of draining into the in-plane flow path and entering the building enclosure can be further reduced.

Moreover, the rainwater that has entered from the joint is immediately flowed into the channel in the rising surface portion formed between the roof-side roofing material of the rising surface portion and the roof finishing material,
Drained outside the building.

  For this reason, the composite roof part with favorable watertightness is provided further.

Next, the watertight structure of the composite roof part of the best mode for carrying out the present invention will be described with reference to the drawings.

  The same or equivalent parts as those in the conventional example will be described with the same reference numerals.

  1 to 4 show a watertight structure of a composite roof portion according to the preferred embodiment of the present invention.

First, the structure of this embodiment will be described. As shown in FIG. 2, the unit building 14 as the building of this embodiment is arranged above the plurality of one-floor room units 15 ... and 16 ...
The second-floor room units 17 are placed, and the living space on the first floor and the living space on the second floor are mainly formed.

  Composite roof portions 18 and 19 are provided on the upper portions of the first and second floor portions, respectively.

Among these, the composite roof portion 19 provided at the upper part of the second floor portion is disposed adjacent to the inclined roof portion 20 having a certain roof slope and the north eaves portion of the inclined roof portion 20, As shown in FIG. 3, the inclined roof portion 21, the flat roof portion 21, and the flat roof portion 21 are provided on the upper part of the second-floor room unit 17 on the adjacent land boundary L side. Are connected to each other.

Of these, the inclined roof portion 20 is spaced from the ridge portion 20a provided substantially at the center so that an inclined surface having a constant inclination angle and descending toward both sides is formed. A plurality of rafters 22 extending along the flow direction are arranged side by side, and these rafters 22 are arranged in parallel.
Is provided along the eaves extending direction and is fixed so as to be integrated with the building frame 2
It is supported by 3 ...

Further, flat plate-like field plate members 24 are pasted on the upper surface side of the rafters 22 and are mounted on the upper surface side of the field plate members 24 as shown in FIG. Roof finishing material 10
, 10 and the nails 11...

Each of these roofing materials 10 has an elongated panel shape in which an engaging hook portion 10c and an engaged convex portion 10d are integrally bent at the front and rear side edges in the flow direction, and are arranged adjacent to each other. By engaging these engaging hooks 10c and engaged projections 10d between the other roof finishing materials 10, 10, a plurality of roof finishing materials 10 ... are like a single plate material, It is joined.

Further, a front end roof finishing material 10 </ b> A in which a front end folded portion 10 a that bends so that the front end edge is along the back surface side is laid on the eaves side edge of the inclined roof portion 20.

In addition, the flat roof portion 21 is provided on the eaves side and the left and right sides of the flat bottom surface portion 21a.
The side wall portions 21b, 21c,... Are formed with a certain height so as to surround the periphery from three directions. As shown in FIG. 9, sheet-like members 21d and 21e extending from the inner and outer surfaces are overlaid on the upper surfaces of the side wall portions 21b, 21c,. A parapet accessory 21 f made of a composite material of a steel plate and a sheet material as shown in FIG. 7 or FIG. 8 is fitted on 21 e.

Further, from above the parapet accessory 21f, a ventilation cap member 21h as shown in FIG. 3 or FIG. 5 covers an upper surface portion 21g of each of the side wall portions 21b, 21c,. It is fixed.

On the land roof portion 21, a rising surface portion 25 extends substantially vertically at a side edge on the ridge side.

The rising surface portion 25 is provided on the outer surface side of the cross girder member 23 located at the edge of the eaves side of the inclined roof portion 20, and is fixed along the vertical wall surface member 26 and the vertical wall surface member 26. The roof finishing material 10 has a vertical finishing member 27 as one of the roof finishing materials for fitting an upper end portion 27a integrally bent toward the eaves side to the front end folded portion 10a. It is configured.

As shown in FIGS. 4 and 5, the vertical finishing member 27 of this embodiment has a ventilation head member 21 h of the side wall portions 21 c and 21 c of the flat roof portion 21 over substantially the entire vertical direction of the rising surface portion 25. It extends to the vicinity of the upper end.

The vertical finishing member 27 has a fixing concave portion 27b formed in the vicinity of the upper end portion 27a and substantially in the center in the vertical direction, fixed to the vertical wall surface member 26 using the nails 11 and 11, The inclined roof portion 20 and the flat roof portion 21 are continuously covered.

At the joint portion between the eaves side of the inclined roof portion 20 and the upper end of the rising surface portion 25 of the flat roof portion 21, on the inside of the vertical finishing material 27 provided along the rising surface portion 25,
A frame-side roof finishing material 28 as shown in FIGS. 1 and 7 is provided so as to be erected substantially vertically, being interposed outside the vertical wall surface member 26.

The frame-side roof finishing material 28 of this embodiment is made of stainless steel plate, and its upper end portion is bent in accordance with the inclination angle of the inclined roof portion 20 so as to have an extended interposed portion 28a having a certain width dimension w1.
Is formed.

Furthermore, the lower end portion of the frame-side roof finishing material 28 is integrally bent toward the eaves direction at a substantially right angle so as to exhibit a substantially L-shaped cross section, and covers the upper surface of the bottom surface portion 21a of the land roof portion 21. It is so extended.

In addition, an upper asphalt roofing 31 as a waterproof paper is laid on the upper surface side of the inclined roof portion 20 of this embodiment, and the casing is doubled on the lower surface side of the upper asphalt roofing 31. Lower asphalt roofing 32 as side waterproof paper
Is laid.

Then, the extended interposing part 28a is interposed below the eaves edge side edge 31a of the upper asphalt roofing 31, so that the upper asphalt roofing 31 and the frame-side roof finishing material 28 are On the eaves upper surface side of the inclined roof portion 20, the overlapping portion 4 is superposed.
0 is provided.

Furthermore, in the superposition | polymerization part 40 of this embodiment, the eaves edge side edge part 32a of the said lower side asphalt roofing 32 is piled up and superposed | stacked on the lower side of the extending interposed part 28a of the said housing side roof finishing material 28. ing.

That is, between the upper surface of the eaves edge side edge portion 32a of the lower asphalt roofing 32 and the lower surface of the extended interposing portion 28a of the housing side roof finish 28, a rubber sponge member 41 as a watertight member is provided. Is attached so that rainwater does not enter the building housing side from between the eaves edge portion 32a and the extended intervention portion 28a.

And in the connection part 30 of this embodiment, the front end of 10 A of roof finishing materials provided in the upper end part 27a of the said vertical finishing member 27 provided along the said rising surface part 25, and the eaves side of the said inclined roof part 20 The joint portion with the folded portion 10a is the upper end portion 2 of the vertical finishing member 27.
When the vicinity of 7 a is fixed using the nails 11, 11, the wooden bridges 42, 43 are interposed so as to project upward in the eaves direction toward the upper portion of the land roof portion 21. The upper asphalt roofing 31 laid on the upper surface side is separated from the upper flow path.

Furthermore, a flow-down opening 44 is formed between the joint and the end edge of the extended intervention part 28a.

Further, the rising surface portion inner passage 45 communicating with the upper flow passage of the upper asphalt roofing 31 of the inclined roof portion 20 includes the outer surface of the housing side roof finishing material 28 of the rising surface portion 25, and the vertical finishing material 27. It is formed between the back side.

Further, decorative parapet members 50, 50 as shown in FIGS. 2 and 3 are mounted around the inclined roof portion 20, and the appearance harmony with the ventilation headboard member 21h of the land roof portion 21 is achieved. In addition, a skylight portion 51 is provided on the inclined roof portion 20 on the opposite side.

  Next, the effect | action of the watertight structure of the composite roof part of this embodiment is demonstrated.

In this embodiment, the extended interposing part 28a is interposed below the eaves side edge 31a of the upper asphalt roofing 31 laid on the upper surface side of the inclined roof part 20, thereby The upper asphalt roofing 31 and the frame side roof finishing material 28 are superposed on the upper surface side of the field plate member 24 of the inclined roof portion 20.

For this reason, in the inclined roof portion 20, even if rainwater enters the lower surface side of the roof finishing material 10 from the joints between the roof finishing materials 10 and 10, as shown in FIG. From the upper surface side of the upper asphalt roofing 31 of the inclined roof portion 20, it passes above the overlapping portion 40 and smoothly flows down into the rising surface portion 25 through the flow opening 44.

Then, this rainwater flows down from the outer surface of the frame-side roof finishing material 28 toward the upper surface of the bottom surface portion 21 a of the land roof portion 21 from the channel 45 in the rising surface portion.

The extended intervention part 28a is formed on the lower inner side of the roof finishing material 10A and the vertical finishing member 27.
Since the upper end portion of the roof-side roof finishing material 28 erected substantially vertically is bent in accordance with the inclination angle of the inclined roof portion 20 on the inner side of the building housing direction, It can be made of a corrosion-resistant metal material such as a stainless steel plate.

For this reason, it is possible to improve the durability and reduce the construction error as compared with the case where two waterproof papers are overlapped as in the conventional overlapped portion.

  Therefore, variation in watertight performance can be reduced.

Further, in the inclined roof portion 20, the eaves edge side edge portion 32a is superposed on the lower side of the extended interposing portion 28a of the frame side roof finish 28 together with the upper asphalt roofing 31, and is polymerized. Lower asphalt roofing 32 is provided, and waterproof paper is laid so as to be double.

For this reason, even if rain leaks from the upper asphalt roofing 31 or the like, the lower asphalt roofing 32 prevents the rainwater from entering the building frame.

  Therefore, the watertight performance is further good.

Moreover, in the unlikely event that rainwater has entered the upper surface of the lower asphalt roofing 32, the rainwater that has entered the upper edge of the eaves side edge 32 a of the lower asphalt roofing 32 and the extended interposing part 28 a of the roof roofing material 28 are also provided. The rubber-based sponge member 41 attached between the lower surface and the lower surface is dammed.

For this reason, it exudes from between the upper surface of the eaves edge side edge part 32a of the lower asphalt roofing 32 and the lower surface of the extended interposition part 28a of the said housing side roof finishing material 28, and infiltrates the inside of a building frame. There is nothing.

In addition, in this embodiment, since the eaves side end edge portion 31a of the upper asphalt roofing 31 is superimposed on the upper surface of the extended intervention portion 28a, the overlapping portion 40 is configured. The rainwater on the upper surface of the lower asphalt roofing 32 is drained from between the upper surface of the extended intervention part 28a and the lower surface of the eaves edge part 31a.

For this reason, rainwater passes over the extended intervening portion 28a of the frame-side roof finishing material 28 and passes through the upper surface side, and travels from the flow-down opening 44 to the outside of the outer surface of the frame-side roof finishing material 28. Then, it flows down from the flow path 45 in the rising surface portion and is drained.

Therefore, the rainwater flowing down the upper surface of the lower asphalt roofing 32 is drained without staying, and can exhibit stable watertight performance.

Further, in the connection portion 30 of this embodiment, the upper end portion 27a of the vertical finishing member 27 provided along the rising surface portion 25 and the front end of the roof finishing material 10A provided on the eaves side of the inclined roof portion 20 are provided. A joint portion with the folded portion 10a is projected in the eaves direction toward the upper side of the flat roof portion 21, and is separated from the upper flow path of the upper asphalt roofing 31 laid on the upper surface side of the inclined roof portion 20. Has been.

Moreover, the rainwater that has entered the upper surface of the upper asphalt roofing 31 flows smoothly into the rising surface portion 25 via the flow-down opening 44 through the outer side of the outer side of the frame-side roof finishing material 28. Is done.

For this reason, it is possible to reduce the possibility that rainwater is directly applied to the joint portion formed in the front end folded portion 10a of the roof finishing material 10A and deteriorates to impair waterproofness.

Further, when the vicinity of the upper end portion 27a of the vertical finishing member 27 is fixed using the nails 11 and 11, the flow opening 44 can be easily formed by interposing the wooden crosses 42 and 43, and the flow down Since the water is drained into the flow path 45 in the rising surface portion through the opening 44, the possibility of entering the building housing can be further reduced.

Moreover, rainwater that has entered from the joint formed in the front end folded portion 10a of the roof finishing material 10A immediately passes through the flow-down opening 44 and the roof-side roof finishing material 28 of the rising surface portion 25 and the vertical roof. The rising surface portion internal flow path 4 formed between the finishing member 27 and the finishing member 27.
It flows down into 5 and drains outside the building.

For this reason, a composite roof part with good water tightness is further provided. For example, as shown in FIGS. 2 and 3, these inclined roof parts 20 are provided on the upper part of the second-floor room unit 17 on the adjacent boundary line L side. And the connection part 30 which connects the land roof part 21 can be provided, and this land roof part 21 can be used as a snow stopper for snowfall prevention.

The embodiment of the present invention has been described in detail above with reference to the drawings. However, the specific configuration is not limited to this embodiment, and design changes that do not depart from the gist of the present invention are not limited to this embodiment. Included in the invention.

That is, in the said embodiment, the composite roof parts 18 and 19 used for the unit building 14 comprised combining the some 1st floor room unit 15 ..., 16 ... and the 2nd floor room unit 17. FIG.
However, the present invention is not limited to this, for example, in the composite roof portion of a building constructed by another construction method such as a prefab building using another construction method such as a wooden conventional construction method or a two-by-four construction method,
It may be used, and the shape of the composite roof portion, the inclination angle of the inclined roof portion 20 and the like are not limited. In addition, the roof side roof finishing material 28, the upper and lower asphalt roofing 31, 3
2 and the material of the constituent members such as the rubber sponge member 41 are not particularly limited.

In the watertight structure of the composite roof portion of the embodiment of the present invention, AA in FIG. It is an expanded sectional view near the upper end of the rising surface at a position corresponding to the position along the line. It is a watertight structure of the composite roof part of embodiment of this invention, and is a perspective view explaining the structure of the whole building. FIG. 3 is a cross-sectional view of the composite roof portion at a position along the line BB in FIG. 2 in the watertight structure of the composite roof portion of the embodiment of the present invention. It is a watertight structure of the composite roof part of embodiment, and is an expanded sectional view of the rising surface part vicinity vicinity in the position along the AA line in FIG. It is an expanded sectional view explaining the structure of the side wall part vicinity in the position along the CC line in FIG. 2 with the watertight structure of the composite roof part of embodiment. It is the watertight structure of the composite roof part of embodiment, and is a top view of the building explaining the composite roof part mounted on the second-floor room unit. In the watertight structure of the composite roof portion of the embodiment, the upper end of the rising surface portion at a position corresponding to the position along the line AA in FIG. It is an expanded sectional view of the neighborhood. In the watertight structure of the composite roof portion of the embodiment, in the state before mounting the roof finishing material, the configuration of the main part is explained. The vicinity of the side wall portion at a position corresponding to the position along the line CC in FIG. It is an expanded sectional view explaining the structure. It is a longitudinal cross-sectional view explaining the structure of the upper part of the side wall part before mounting | wearing with the watertight structure of the composite roof part of embodiment, and attaching a ventilation headboard member. It is a perspective view of the building explaining the whole structure with the compound roof part of a prior art example. It is sectional drawing in the position which shows an example which applied the general waterproofing structure to the connection part of a composite roof, and corresponds to the position along the DD line in FIG.

Explanation of symbols

10, 10A Roof finishing material 27 Vertical finishing material (Roof finishing material)
14 unit building
18, 19 Composite roof part 20 Inclined roof part 21 Flat roof part 25 Rising surface part 28 Housing side roof finishing material 28a Extension interposing part 30 Connection part waterproof paper 31 Upper asphalt roofing 32 Lower asphalt roofing (body side waterproof paper)
31a, 32a eaves side edge 40 overlapped portion 41 rubber sponge member (watertight member)

Claims (4)

In the upper part of the building, an inclined roof portion having a certain roof slope and a land roof portion arranged adjacent to the inclined roof portion and extending substantially horizontally are provided, and a plurality of roof finishes are provided. The material is joined to form a watertight structure of a composite roof portion that continuously covers the inclined roof portion and the flat roof portion,
At the joint portion between the eaves side of the inclined roof portion and the rising surface portion of the flat roof portion, the inside of the roof finishing material provided along the rising surface portion, the frame-side roof finishing material erected substantially vertically The upper end portion is bent according to the inclination angle of the inclined roof portion to form an extended interposed portion, and the extended interposed portion is made of waterproof paper laid on the upper surface side of the inclined roof portion. A composite comprising a superposition part for polymerizing the waterproof paper and the roof side roof finishing material on the upper surface side of the inclined roof part by interposing under the eaves side edge part Watertight structure of the roof. The housing side waterproof paper is laid on the lower surface side of the waterproof paper laid on the upper surface side of the inclined roof portion so as to be doubled, and the eaves side edge of the housing side waterproof paper is disposed on the housing side. 2. The watertight structure of a composite roof portion according to claim 1, wherein polymerization is performed by superimposing on the underside of the extended interposed portion of the roof finishing material. 3. The composite according to claim 2, wherein a watertight member is attached between an upper surface of an eaves edge side edge portion of the frame side waterproof paper and a lower surface of an extended interposed portion of the frame side roof finish. Watertight structure of the roof. A joint portion between the upper end portion of the roof finishing material provided along the rising surface portion and the eave edge side edge portion of the roof finishing material provided on the eave side of the inclined roof portion is directed upward of the land roof portion. Projecting in the direction of the eaves away from the flow path on the upper side of the waterproof paper laid on the upper surface side of the inclined roof portion, and a flow-down opening between the joint portion and the extended interposing portion The rising surface portion in-flow passage formed and communicated with the inclined roof portion is formed between the housing-side roof finishing material of the rising surface portion and the roof finishing material. The watertight structure of the composite roof part as described in any one of thru | or 3.

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