JP2016125240A - Ventilation structure for building - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a ventilation structure for a building that ensures ventilation between an outdoor side and an attic side while suppressing water infiltration into the attic side from a gap between a roof board material and a ventilation furring strip.SOLUTION: An edge part 60A of an outside waterproof sheet 60 is fixed on a surface on an indoor side of an upper wall part 38A of a steel sheet accessory 38, and the other edge part 60B of the outside waterproof sheet 60 is bonded on an outer surface part 56B on an outdoor side of a ventilation furring strip 56. As such, a gap that might be formed between the ventilation furring strip 56 and a side wall part 38B of the steel sheet accessory 38 is closed by the other edge part 60B of the outside waterproof sheet 60. Also, water that infiltrates from the gap between the ventilation furring strip 56 and the side wall part 38B of the steel sheet accessory 38 is blocked by the outside waterproof sheet 60 before infiltrating into an attic 46. Furthermore, the other edge part 60B of the outside waterproof sheet 60 adheres tightly on the outer surface part 56B of the ventilation furring strip, by being bonded on the outer surface part 56B. As such, water sprayed on the bonded part between the outside waterproof sheet 60 and the ventilation furring strip 56 may also be blocked.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a ventilation structure for a building.

  The following Patent Document 1 discloses an invention related to a ventilation structure of a building. In the ventilation structure of this building, the ventilator edge is arranged between the outer wall material and the side wall portion of the steel plate accessory (roof plate material). For this reason, the ventilation path which connects the outdoor side and the attic side is formed by the ventilation trunk edge, and ventilation of the attic can be performed.

JP2013-057213A (FIG. 1)

  However, in the ventilation structure of a building disclosed in Patent Document 1, the side wall portion and the ventilation trunk edge of the steel plate accessory are fixed to the outer wall material with a common tapping screw, and the side wall portion and the ventilation trunk edge are in contact with each other. However, these members are not in close contact with each other. For this reason, there was room for improvement with respect to water intrusion into the attic side from the gap between the steel plate member and the ventilator edge.

  In consideration of the above-mentioned fact, the present invention provides a ventilation structure for a building that can prevent water from entering the attic side from the gap between the roof plate material and the ventilation trunk edge while ensuring the air permeability between the outdoor side and the attic side. The purpose is to obtain.

  The building ventilation structure according to the first aspect is provided on the upper wall portion constituting the roof surface of the roof of the building and the peripheral portion of the upper wall portion, along the upper end portion of the outer wall of the building and the upper end portion A roof plate material that includes a side wall portion that extends from the outdoor side and is spaced from the upper end portion, and is disposed between the side wall portion and the upper end portion. A ventilator rim formed with a communicating portion that communicates the attic side of the building and the outdoor side, one end is fixed to the indoor side surface of the upper wall, and the other end is the ventilator rim And a waterproof sheet bonded to the surface on the outdoor side.

  In the ventilation structure of the building according to the first aspect, the roof plate material is configured to include an upper wall portion constituting the roof surface of the roof of the building and a side wall portion provided at a peripheral edge portion of the upper wall portion, Space is secured in the attic of the building. Further, the side wall portion of the roof plate extends along the upper end portion of the outer wall of the building so as to cover the upper end portion from the outdoor side, and is disposed at a distance from the upper end portion. A ventilator rim is disposed between the side wall portion of the roof plate material and the upper end portion of the outer wall of the building, and the attic side of the building and the outdoor side communicate with each other by a communication portion formed on the ventilator rim. Has been. For this reason, the attic side and the outdoor side of the building can be ventilated to ventilate the space of the attic.

  By the way, when a clearance gap arises between a ventilation trunk edge and the side wall part of a roof board | plate material, it is possible that water permeates into the attic side from the clearance gap.

  Here, in this aspect, one end portion of the waterproof sheet is fixed to the indoor side surface of the upper wall portion of the roof plate material, and the other end portion of the waterproof sheet is bonded to the outdoor side surface of the ventilation trunk edge. . For this reason, even if a clearance gap arises between a ventilation trunk edge and the side wall part of a roof board | plate material, the said clearance gap can be plugged up with the other end part of a waterproof sheet. Further, even if the gap between the ventilator edge and the side wall portion of the roof plate material cannot be completely blocked by the waterproof sheet, the water entering from the gap is blocked by the waterproof sheet before entering the attic. In addition, the other end portion of the waterproof sheet is adhered to the surface of the ventilator rim on the outdoor side, and is in close contact with the surface, and water sprayed on the adhesive portion between the waterproof sheet and the ventilator rim can also be blocked. .

  The building ventilation structure according to the second aspect is the building ventilation structure according to the first aspect, wherein the other end terminates at an end of the exterior side surface of the ventilation trunk edge on the building lower side. ing.

  In the building ventilation structure according to the second aspect, the other end portion of the waterproof sheet is terminated at the end portion on the outdoor side of the ventilation trunk edge on the building lower side. For this reason, compared with the case where the other end portion of the waterproof sheet is terminated on the upper side of the building relative to the end portion on the lower side of the building on the outdoor side surface of the ventilator edge, the adhesive area between the waterproof sheet and the ventilator edge Can be secured. Moreover, when the extra length part extended to the building lower side rather than the edge part of the building lower side of the outdoor side surface of the ventilation trunk edge is set in the waterproof sheet, water or wind blows on the extra length part. It is conceivable that the adhesive state between the waterproof sheet and the ventilator edge cannot be maintained. However, in this aspect of the above configuration, it is possible to stably maintain the adhesive state between the waterproof sheet and the ventilator edge without being affected by water or wind.

  The building ventilation structure according to a third aspect is the building ventilation structure according to the first aspect or the second aspect, wherein the one end portion constitutes the roof and is disposed on the building lower side of the upper wall portion. Is sandwiched between the roof member and the upper wall portion.

  In the building ventilation structure according to the third aspect, the one end portion of the waterproof sheet is sandwiched between the upper wall portion of the roof plate material and the roof member, so that the one end portion is in close contact with the upper wall portion.

  The building ventilation structure according to a fourth aspect is the building ventilation structure according to the third aspect, wherein the waterproof sheet covers a corner of a peripheral edge of the roof member from the outdoor side and the other end is the ventilation. An inner waterproof sheet bonded to the indoor side surface of the trunk edge, and a linear portion at the peripheral edge portion are arranged to cover the inner waterproof sheet as viewed from the outdoor side while covering the straight line portion from the outdoor side, and the other end portion is the ventilation And an outer waterproof sheet adhered to a surface on the outdoor side of the trunk edge.

  In the building ventilation structure according to the fourth aspect, the corners at the peripheral edge of the roof member are covered with the inner waterproof sheet, so that water can penetrate from the corners to the attic even if the corners are covered with water. Is suppressed. In addition, the linear portion at the peripheral edge portion of the roof member is covered with the outer waterproof sheet, and the outer waterproof sheet is arranged so as to overlap the inner waterproof sheet when viewed from the outdoor side, so that the air permeability by the ventilation trunk edge is provided. Secured.

  The building ventilation structure according to the fifth aspect is the building ventilation structure according to the fourth aspect, wherein the inner waterproof sheet is a molded product formed in accordance with the shape of the corner.

  In the building ventilation structure according to the fifth aspect, the inner waterproof sheet is a molded product, and the shape of the inner waterproof sheet can correspond to the shape of the corner of the roof member.

  The building ventilation structure according to a sixth aspect is the building ventilation structure according to any one of the first to fifth aspects, wherein the side wall includes the side wall and the outer wall. A draining portion is provided on the upper side of the building from the ventilation portion that is configured and capable of ventilation to the attic side.

  In the ventilation structure of the building according to the sixth aspect, water flowing from the upper side of the roof to the side wall portion of the roof plate material flows along the draining portion, and water enters from the ventilation portion provided on the lower side of the building of the draining portion. Can be suppressed.

  The building ventilation structure according to a seventh aspect is the building ventilation structure according to the sixth aspect, wherein the roof is a land roof and is provided with eaves along the longitudinal direction of the side wall portion. .

  In the building ventilation structure according to the seventh aspect, eaves walls are provided along the longitudinal direction of the side wall portion of the roof plate constituting the flat roof, and draining from the upper side of the roof without impairing the design of the building. The water that flows along the section can be drained.

  As described above, in the ventilation structure of the building according to the first aspect, water intrusion to the attic side from the gap between the roof plate material and the ventilation trunk edge is suppressed while ensuring the air permeability between the outdoor side and the attic side. It has an excellent effect of being able to.

  The building ventilation structure according to the second aspect has an excellent effect that the adhesion between the waterproof sheet and the ventilation trunk edge can be secured.

  The building ventilation structure according to the third aspect has an excellent effect that water can be prevented from entering the building upper side in the attic.

  The building ventilation structure according to the fourth aspect has an excellent effect that it is possible to achieve both the waterproofness of the attic and the ventilation of the attic in accordance with the shape of the roof.

  The building ventilation structure according to the fifth aspect has an excellent effect that the waterproofness of the attic can be improved at the corners of the roof.

  In the building ventilation structure according to the sixth aspect, there is an excellent effect that the intrusion of water flowing from the upper side of the building into the attic side can be suppressed.

  The building ventilation structure according to the seventh aspect has an excellent effect that it is possible to achieve both the securing of the design of the building and the suppression of the intrusion of water flowing from the upper side of the building into the attic side.

It is an expanded sectional view (enlarged view of the portion surrounded by the broken line X of FIG. 10) showing the ventilation structure of the building concerning this embodiment. (A) is an expanded sectional view (enlarged view of a portion surrounded by a broken line Y in FIG. 1) showing the accommodation on the roof side of the ventilation structure of the building according to the present embodiment, and (B) is the present embodiment. It is an expanded sectional view (enlarged view of the part enclosed with the broken line Z of FIG. 1) which shows the accommodation by the side of the outer wall of the ventilation structure of the building which concerns on. It is a perspective view which shows the accommodation of the waterproof sheet in the corner part of a roof member concerning this embodiment. It is a perspective view which concerns on this embodiment and shows the accommodation of a ventilation trunk edge. It is an enlarged perspective view which shows the accommodation of the waterproof sheet in the linear part of a roof member concerning this embodiment. It is a perspective view which shows the detail of the accommodation of the waterproof sheet in the protrusion corner part of a roof member concerning this embodiment. It is a perspective view which shows the detail of the accommodation of the waterproof sheet in the corner part of a roof member concerning this embodiment. It is sectional drawing (sectional drawing which shows the state cut | disconnected along the 8-8 line of FIG. 5) which concerns on this embodiment and shows arrangement | positioning of the waterproof sheet in the corner part of a roof member. It is an enlarged perspective view which shows the joint part of the waterproof sheet in the linear part of a roof member concerning this embodiment. It is sectional drawing which shows the ventilation structure of the building which concerns on this embodiment (sectional drawing which shows the state cut | disconnected along the 10-10 line of FIG. 11). It is a perspective view showing the building to which the ventilation structure of the building concerning this embodiment was applied.

  Hereinafter, an example of a building to which the ventilation structure of the building according to the present invention is applied will be described with reference to FIGS.

  First, the overall structure of the building 10 according to the present embodiment will be described. As shown in FIG. 11, a building 10 includes a plurality of building units including building units 14, 16 installed on a foundation 12, and the lower floor side is configured. And the upper floor side of building 10 is constituted by installing a plurality of building units including building units 18 and 20 on these lower floor side building units.

  The construction of a building unit housing (not shown) will be described taking the building unit 18 as an example. The building unit housing connects the pillars erected at the four corners, the ceiling frame that connects the upper ends of the columns, and the lower ends of the columns. The floor frame is configured in a substantially box shape. The ceiling frame is configured in a ladder shape by two types of long and short ceiling beams each formed of channel steel. On the other hand, the floor frame has the same configuration as that of the ceiling frame, and has two types of long and short channel steels arranged in a ladder shape. And the outer wall panel 24 is attached along with the outer peripheral surface of the building 10 to the floor frame and the ceiling frame, and constitutes a part of the outer wall 22 of the building 10.

  As shown in FIG. 10, the outer wall panel 24 is configured by attaching a rectangular flat plate-like outer wall member 26 to the outer wall frame 30 with screws or the like (not shown). In addition, the upper end portion 26A of the outer wall member 26 is thinner than the general portion 26B of the outer wall member 26. In other words, the upper end portion 26A of the outer wall member 26 has the upper end portion 26A in the general portion 26B of the outer wall member 26. A step which is recessed toward the indoor side with respect to the design surface 26B1 is formed. Hereinafter, the portion where the step is formed is referred to as “recess 28”. In addition, the surface along the building up-down direction of the recessed part 28 is the attachment surface 28A to which the ventilation trunk edge 56 mentioned later is attached.

  On the other hand, the outer wall frame 30 is configured in a rectangular frame shape or a ladder shape including a horizontal beam 32 and a vertical beam 34 formed of channel steel. The outer wall frame 30 is fixed to a ceiling beam (not shown) on the upper side of the building and to a floor beam (not shown) on the lower side of the building by bolts or the like not shown. Further, a roof frame (not shown) is attached to the ceiling beam to which the building upper side of the outer wall frame 30 is fixed, and the roof portion 36 of the building 10 is supported by the roof frame.

  The roof portion 36 includes a steel plate accessory 38 as a roof plate material, a field plate 40 and a heat insulating material 42 as roof members. The roof portion 36 is configured as a so-called flat roof in which the roof surface 44 is a flat surface having no inclination. In addition, the flat shape without inclination includes a flat shape that is inclined to the extent that a water gradient can be secured.

  The field plate 40 is disposed on the building frame upper side of the roof frame, and is formed of plywood, ALC (lightweight concrete) or the like. The heat insulating material 42 is disposed on the upper surface portion 40 </ b> A facing the building upper side of the field board 40 and is formed of a foaming resin such as polystyrene foam, and suppresses condensation on the indoor side of the building 10. It has a function.

  The steel plate member 38 includes an upper wall portion 38A constituting the roof surface 44 of the building 10 and a side wall portion 38B provided integrally with the upper wall portion 38A on the peripheral edge portion of the upper wall portion 38A. , DN steel plate. More specifically, the upper wall portion 38A of the steel plate accessory 38 extends in the building girder direction and the building wife direction, and is disposed on the upper surface portion 42A of the heat insulating material 42 facing the building upper side. In addition, the center part of the roof surface 44 is comprised with the DN sheet | seat which is not shown in figure. That is, when viewed as the entire roof surface 44, the upper wall portion 38 </ b> A of the steel plate accessory 38 constitutes the outer peripheral portion of the roof surface 44.

  On the other hand, the side wall part 38B is bent from the peripheral part of the upper wall part 38A to the lower side of the building, and extends along the upper end part 26A of the outer wall material 26 (upper end part 22A of the outer wall 22). The upper end portion 26 </ b> A is spaced from the upper end portion 26 </ b> A. Further, as shown in FIG. 1, the lower end portion 38B1 of the side wall portion 38B reaches a position sufficient to cover the concave portion 28 of the outer wall material 26 with the side wall portion 38B when viewed from the outdoor side, and the side wall portion 38B. Is folded so as to overlap the outer wall 22 side at the lower end 38B1. Hereinafter, a portion of the side wall portion 38B that is folded back toward the outer wall 22 is referred to as a “hemming portion 38B2.” In addition, in the space covered with the DN sheet constituting the steel plate member 38 and the roof surface 44, a portion on the indoor side with respect to the outer wall 22 is referred to as “attic 46”. And the eaves 48 is arrange | positioned at the outdoor side of the side wall part 38B of the steel plate accessory 38. As shown in FIG.

  The eaves 48 is formed in a U shape with the upper side of the building open as viewed from the width direction of the outer wall panel 24 and extends in the width direction, and flows from a draining portion 54A of the draining 54 described later. Receive water. Further, a through portion (not shown) is formed in the bottom portion 48A of the eaves bowl 48, and a vertical rod 50 is connected to the through portion. Thereby, the water that has flowed into the eaves wall 48 flows into the vertical wall 50 and flows to the lower side of the building. The eaves rods 48 are arranged at a plurality of locations in the longitudinal direction of the eaves rods 48 and are held by suspension members 52 fixed to the outer wall panel 24 by screws or the like (not shown).

  Here, in this embodiment, the ventilation structure of a building is comprised including the drainer 54, the ventilation trunk edge 56, the outer side waterproof sheet 60, and the inner side waterproof sheet 62 as an example. Hereinafter, an example of the structure of the ventilation structure of the building which is the principal part of this invention is demonstrated in detail.

  First, the configuration of the drainer 54 will be described with reference to FIG. The drainer 54 includes a drainer 54A, a cover 54B, and an extension 54C, and is formed of a plate material such as aluminum. The drainer 54 is attached on the outdoor side of the side wall 38B of the steel plate accessory 38 so as to be disposed on the upper side of the building from the eaves 48. Specifically, the cover portion 54B is formed in a flat plate shape along the vertical direction of the building, and is attached to the outer wall panel 24 by a tapping screw 64 screwed from the outdoor side together with the side wall portion 38B of the steel plate member 38 and the ventilation trunk edge 56 and the like. It is attached. And the draining part 54A is provided in the upper end part 54B1 of the cover part 54B.

  The draining portion 54A is formed so as to incline toward the lower side of the building as it goes from the upper end portion 54B1 of the covering portion 54B to the outdoor side, and its tip end portion extends toward the lower side of the building. Thereby, the water which flowed from the roof part 36 flows along the draining part 54A, and flows down to the eaves wall 48 mentioned above.

  On the other hand, as shown in FIG. 1, the lower end portion 54B2 of the covering portion 54B reaches the lower end portion 38B1 of the side wall portion 38B, and the side wall portion 38B is from the outdoor side except for a part on the upper side of the building. Covered by the cover 54B. Further, the lower end portion 54B2 of the cover portion 54B is formed with a flat plate-like extension portion 54C extending toward the indoor side, more specifically, toward the lower end portion of the mounting surface 28A of the outer wall member 26. . Further, a predetermined gap is set between the distal end portion of the extending portion 54C and the mounting surface 28A of the recess 28, and the gap serves as a ventilation portion that leads from the outdoor side to the attic 46 side. The vent 66 is used. In addition, the front-end | tip part of 54 C of extension parts is folded and formed so that it may overlap with the building upper side.

  The ventilation trunk edge 56 is made of a prismatic resin material and is disposed between the side wall portion 38B of the steel plate accessory 38 and the mounting surface 28A of the outer wall material 26. Specifically, the inner surface portion 56 </ b> A facing the indoor side of the ventilator rim 56 is bonded to the mounting surface 28 </ b> A of the outer wall material 26 via an EPT SEALER 68 (registered trademark) or the like. On the other hand, an outer waterproof sheet 60 is bonded to the outer surface part 56B facing the outdoor side of the ventilator rim 56, as will be described later, and on the outdoor side of the outer waterproof sheet 60, the side wall part of the steel plate member 38 is attached. 38B is arranged. As described above, the ventilator edge 56 is attached to the outer wall panel 24 by the tapping screw 64 together with the side wall portion 38B of the steel plate member 38, the drainer 54 and the like. The ventilator edge 56 is in contact with the side wall 38B through the outer waterproof sheet 60 by screwing a tapping screw 64 from the outdoor side of the side wall 38B of the steel plate member 38. .

  Further, the outer surface portion 56B of the ventilating trunk edge 56 is provided with a ventilation groove 58 as a communication portion along the vertical direction of the building, and the cross-sectional shape of the ventilation groove 58 is a steel plate function when viewed in the vertical direction of the building. The side wall 38 </ b> B side of the object 38 has a semicircular shape opened. The space above the building (at the attic 46) side of the ventilation trunk edge 56 communicates with the space below the building (outdoor side) of the ventilation trunk edge 56 by the ventilation groove 58 of the ventilation trunk edge 56. Furthermore, the extension part 54C of the above-described drainer 54 is arranged on the building lower side of the ventilation groove 58, and the ventilation groove 58 is covered with the extension part 54C when viewed from the building lower side.

  As an example, the ventilation trunk edge 56 has a length L in the vertical direction of the building set to 30 mm, and the distance between the upper surface portion 56C facing the upper side of the building and the tip of the upper end portion 26A of the outer wall member 26. S is set to 10 mm. That is, the ratio of the length L of the ventilator edge 56 in the vertical direction of the building to the distance S between the upper surface portion 56C and the tip of the upper end portion 26A is set to L: S = 3: 1. According to the above configuration, it is possible to suppress the intrusion of water from the ventilation groove 58 of the ventilation trunk edge 56 to the attic 46 side while suppressing the expansion of the dimensions of the ventilation trunk edge 56 and the upper end portion 26A of the outer wall material 26. It has become. Specifically, even when water is sprayed from the lower side of the building of the ventilation trunk edge 56, the water adheres in the ventilation groove 58 of the ventilation trunk edge 56 so that the infiltration of water to the attic 46 side is suppressed. It has become. Even if water passes through the ventilation groove 58, the upper end portion 26A of the outer wall member 26 prevents water from entering the attic 46 side.

  On the other hand, the hemming portion 38B2 of the steel plate accessory 38 described above extends to the upper side of the building from the upper surface portion 56C of the ventilating drum edge 56. The 56 ventilation grooves 58 are not arranged below the building. That is, the steel plate accessory 38 is configured so as not to block the ventilation groove 58 of the ventilation trunk edge 56 by the hemming portion 38B2.

  Next, the structure of the inner waterproof sheet 62 and the outer waterproof sheet 60 will be described mainly using FIGS. As shown in these drawings, the outer waterproof sheet 60 and the inner waterproof sheet 62 are configured to be elastically deformable by a rubber material or a rubber-like foamed elastic body each made of a CR sheet or the like. As shown in FIGS. 3 and 5, the outer waterproof sheet 60 is on the straight portion 36 </ b> A at the peripheral edge of the roof portion 36, and the inner waterproof sheet 62 is on the right-angled corner 36 </ b> B at the peripheral edge of the roof portion 36. Each is arranged. As shown in FIG. 11, in this embodiment, no corner is set at the peripheral edge of the roof portion 36, but the roof portion 36 is shown in FIGS. 4, 5, and 8 for convenience of explanation. The right inner corner 36C is shown, and the inner waterproof sheet 70 disposed in the corner 36C will also be described.

  As shown in FIG. 5, the outer waterproof sheet 60 is formed in a rectangular band shape in a plan view, and constitutes a straight portion 42 </ b> B in the peripheral portion of the heat insulating material 42, that is, a straight portion 36 </ b> A of the roof portion 36 in the heat insulating material 42. It is arranged along the part to be. This outer waterproof sheet 60 covers from the outdoor side from the upper surface portion 42A of the heat insulating material 42 to the ventilation trunk edge 56 in the straight portion 42B of the heat insulating material 42, and as shown in FIG. One end portion 60A is fixed to the indoor side surface of the upper wall portion 38A of the steel plate accessory 38. On the other hand, the other end portion 60 </ b> B of the outer waterproof sheet 60 on the lower side of the building is fixed to the ventilation trunk edge 56.

  Specifically, as shown in FIG. 2A, one end portion 60 </ b> A of the outer waterproof sheet 60 is bonded to the upper surface portion 42 </ b> A of the heat insulating material 42 through a double-sided tape 72 at the lower surface of the building. On the other hand, the upper surface of the building at the one end portion 60A of the outer waterproof sheet 60 is in close contact with the indoor surface of the upper wall portion 38A of the steel plate member 38 through a sealing material 74 made of rubber foam such as EPDM. It has become a state. That is, one end portion 60A of the outer waterproof sheet 60 is sandwiched between the heat insulating material 42 and the upper wall portion 38A via a member.

  Further, as shown in FIG. 2B, the other end portion 60B of the outer waterproof sheet 60 has an indoor surface bonded to the outer surface portion 56B of the ventilator rim 56 via a butyl tape 76 or the like. Yes. On the other hand, the surface on the outdoor side of the other end portion 60B of the outer waterproof sheet 60 is in close contact with the side wall portion 38B by attaching the side wall portion 38B of the steel plate accessory 38 to the outer wall panel 24 as described above. Yes. As shown in FIG. 1, the position of the tip of the other end portion 60B of the outer waterproof sheet 60 and the position of the end portion of the outer surface portion 56B of the ventilator rim 56 on the lower side of the building coincide, in other words. For example, the other end portion 60 </ b> B of the outer waterproof sheet 60 is terminated at the end portion of the outer surface portion 56 </ b> B of the ventilation trunk edge 56 on the lower side of the building.

  On the other hand, as shown in FIGS. 3 and 6, the inner waterproof sheet 62 constitutes a right-angled corner 42 </ b> C at the peripheral edge of the heat insulating material 42, that is, a corner 36 </ b> B of the roof 36 in the heat insulating material 42. Placed in the part. The inner waterproof sheet 62 is a molded product including an upper surface portion 62A facing the upper side of the building and two side surface portions 62B provided integrally with the upper surface portion 62A. Specifically, the upper surface portion 62A is formed in a concave hexagonal plate shape in which one corner of a square is cut into a square shape smaller than the square, and the side surface portion 62B is the longest of the upper surface portion 62A. It is formed in a rectangular plate shape extending from the two sides to the building lower side. The inner waterproof sheet 62 is fixed by adhering the lower surface of the upper surface portion 62 </ b> A to the upper surface portion 42 </ b> A of the heat insulating material 42 via the two butyl tapes 78.

  Specifically, as shown in FIG. 6, the length of the butyl tape 78 is set to the same length as the two longest sides of the upper surface portion 62A, and the indoor side is parallel to the two sides of the upper surface portion 62A. Are attached along the two sides. In addition, the edge part by the side of the protruding corner part 36B of the roof part 36 in the two butyl tapes 78 has overlapped.

  Further, as shown in FIG. 6, the side surface 62B of the inner waterproof sheet 62 has its lower end 62B1 offset to the upper side of the building with respect to the lower end of the mounting surface 28A of the outer wall material 26. The indoor side surface of the portion 62B1 is in surface contact with the mounting surface 28A. Note that the outdoor side surface of the lower end 62B1 of the side surface portion 62B of the inner waterproof sheet 62 is in contact with the inner surface portion 56A of the ventilator rim 56 as shown in FIG. By configuring the inner waterproof sheet 62 as described above, in the protruding corner portion 42C of the heat insulating material 42, the inner waterproof sheet 62 extends from the upper surface portion 42A of the heat insulating material 42 to the indoor side of the ventilation trunk edge 56 from the outdoor side. Covered.

  On the other hand, as shown in FIG. 3, the inner waterproof sheet 70 is disposed at a right corner portion 42 </ b> D at the peripheral edge portion of the heat insulating material 42, that is, a portion constituting the corner portion 36 </ b> C of the roof portion 36 in the heat insulating material 42. Is done. As with the inner waterproof sheet 62, the inner waterproof sheet 70 is a molded product including an upper surface portion 70A facing the upper side of the building and two side surface portions 70B provided integrally with the upper surface portion 70A. ing. Specifically, as shown in FIG. 7, the upper surface portion 70A is formed in a concave hexagonal plate shape in which a part of a square is cut out in the same manner as the upper surface portion 62A. Each of the portions 62A is formed in a rectangular plate shape extending from the two sides parallel to the longest side to the building lower side. The inner waterproof sheet 70 is fixed by adhering the lower surface of the upper surface 62A to the upper surface 42A of the heat insulating material 42 via the two butyl tapes 80 and 82.

  Specifically, the length of the butyl tape 80 is set to the same length as the two longest sides of the upper surface portion 70A, and is attached along one of the two sides of the upper surface portion 70A. On the other hand, the length of the butyl tape 82 is set to a length shorter than the length of the two longest sides of the upper surface portion 62A by the width of the butyl tape 80, and is not overlapped with the butyl tape 80. It is attached along one of the two sides in 70A.

  Further, as shown in FIG. 7, the side surface portion 70B of the inner waterproof sheet 70 has its lower end portion 70B1 offset to the upper side of the building with respect to the lower end portion of the attachment surface 28A of the outer wall material 26. The surface is in contact with 28A. In addition, the lower end portion 70B1 of the side surface portion 70B of the inner waterproof sheet 70 is in contact with the mounting surface 28A of the outer wall member 26 on the indoor side surface, similarly to the inner waterproof sheet 62. On the other hand, although not shown, the surface on the outdoor side of the lower end 70 </ b> B <b> 1 of the inner waterproof sheet 70 is in contact with the inner surface 56 </ b> A of the ventilator rim 56. By configuring the inner waterproof sheet 70 as described above, in the corner 42D of the heat insulating material 42, the inner waterproof sheet 62 extends from the upper surface portion 42A of the heat insulating material 42 to the indoor side of the ventilation trunk edge 56 from the outdoor side. Covered.

  Next, an example of an installation process of the ventilation trunk edge 56, the outer waterproof sheet 60, and the inner waterproof sheets 62 and 70 in the ventilation structure of the building having the above configuration will be described with reference to FIGS.

  First, as shown in FIG. 3, as shown in FIG. 3, the inner waterproof sheet 62 is fixed to the protruding corner portion 42 </ b> C of the heat insulating material 42 using butyl tape 78, and butyl is added to the entering corner portion 42 </ b> D of the heat insulating material 42. The inner waterproof sheet 70 is fixed using the tapes 80 and 82.

  Next, as a second step, as shown in FIG. 4, the ventilator edge 56 is fixed to the attachment surface 28 </ b> A of the outer wall member 26 using an ept sealer 68. At this time, the lower end portion 62B1 of the inner waterproof sheet 62 and the lower end portion 70B1 of the inner waterproof sheet 70 are sandwiched between the ventilation trunk edge 56 and the attachment surface 28A of the outer wall member 26. Further, the joint portion between the ventilation trunk edges 56 is connected by a quadrangular columnar sealing material 84 made of a rubber foam such as EPDM. In addition, as FIG. 8 shows, it aligned so that the position of the front-end | tip of the lower end part 62B1 of the inner side waterproof sheet 62 and the position of the edge part of the inner surface part 56A of the ventilation trunk edge 56 on the building lower side may correspond. Yes. Although not shown, the lower end portion 70B1 of the inner waterproof sheet 70 is also located at the end of the inner surface 56A of the ventilator rim 56 on the lower side of the building, similarly to the lower end portion 62B1 of the inner waterproof sheet 62. It matches the position of the part.

  Next, as a third step, as shown in FIG. 5, the outer waterproof sheet 60 is placed on the linear portion 42 </ b> B of the heat insulating material 42 from the outdoor side of the ventilation trunk edge 56, the field plate 40 and the heat insulating material 42. At this time, the outer waterproof sheet 60 also covers the inner waterproof sheets 62 and 70 except for a part thereof. In other words, the outer waterproof sheet 60 overlaps the inner waterproof sheets 62 and 70 when viewed from the outdoor side. Is arranged. Then, one end portion 60 </ b> A of the outer waterproof sheet 60 is fixed to the upper surface portion 42 </ b> A of the heat insulating material 42 with the double-sided tape 72, and the other end portion 60 </ b> B of the outer waterproof sheet 60 is fixed to the ventilation trunk edge 56 with the butyl tape 76. Then, in the ventilation structure of the building in which the ventilation trunk edge 56, the outer waterproof sheet 60, and the inner waterproof sheet 62 are installed through the above-described steps, as shown in FIG. The trunk edge 56 is sandwiched between the outer waterproof sheet 60 and the inner waterproof sheet 62. Although not shown, the ventilator edge 56 is sandwiched between the outer waterproof sheet 60 and the inner waterproof sheet 70 at the corner 42D of the heat insulating material 42.

  Further, when the length of the outer waterproof sheet 60 is insufficient, as shown in FIG. 9, the outer waterproof sheet 60 is used with its longitudinal ends connected by butyl tape 86. At this time, the length of the butyl tape 86 is adjusted so as not to overlap the double-sided tape 72.

<Operation and effect of this embodiment>
Next, the operation and effect of this embodiment will be described.

  In this embodiment, as shown in FIG. 1, the steel plate member 38 includes an upper wall portion 38 </ b> A constituting the roof surface 44 of the building 10 and a side wall portion 38 </ b> B provided at the peripheral edge portion of the upper wall portion 38 </ b> A. The attic 46 is secured in the building 10. Further, the side wall portion 38B of the steel plate member 38 extends along the upper end portion 22A of the outer wall 22 of the building 10 so as to cover the upper end portion 22A from the outdoor side, and is arranged at a distance from the upper end portion 22A. ing. A ventilation trunk edge 56 is disposed between the side wall portion 38B of the steel plate member 38 and the upper end portion 22A of the outer wall 22 of the building 10, and the building is defined by the ventilation groove 58 formed in the ventilation trunk edge 56. The attic 46 side of 10 and the outdoor side are connected. For this reason, the attic 46 side and the outdoor side of the building 10 can be ventilated to ventilate the attic 46.

  By the way, when a clearance gap arises between the ventilation trunk edge 56 and the side wall part 38B of the steel plate accessory 38, it is possible that water permeates into the attic 46 side from the clearance gap.

  Here, in the present embodiment, one end portion 60A of the outer waterproof sheet 60 is fixed to the indoor side surface of the upper wall portion 38A of the steel plate member 38, and the other end portion 60B of the outer waterproof sheet 60 is the ventilator edge. It is bonded to the outer surface portion 56B on the outdoor side. For this reason, even if a gap is generated between the ventilator edge 56 and the side wall portion 38 </ b> B of the steel plate accessory 38, the gap can be closed by the other end portion 60 </ b> B of the outer waterproof sheet 60. Even if the gap between the ventilator edge 56 and the side wall portion 38B of the steel plate member 38 cannot be completely closed by the outer waterproof sheet 60, the water entering from the gap does not enter the attic 46 before the outer waterproof sheet. Blocked by 60. In addition, the other end portion 60B of the outer waterproof sheet 60 is adhered to the outer surface portion 56B of the ventilator rim so as to be in close contact with the outer surface portion 56B, and is attached to the adhesive portion between the outer waterproof sheet 60 and the ventilator rim 56. The sprayed water can also be blocked. As described above, in this embodiment, it is possible to prevent water from entering the attic 46 through the gap between the steel plate member 38 and the ventilation trunk edge 56 while ensuring the air permeability between the outdoor side and the attic 46. .

  In the present embodiment, the other end 60 </ b> B of the outer waterproof sheet 60 terminates at the end of the outer surface 56 </ b> B of the ventilator edge 56 on the lower side of the building. For this reason, compared with the case where the other end portion 60B of the outer waterproof sheet 60 is terminated on the upper side of the building than the end portion on the lower side of the building of the outer surface portion 56B of the ventilator edge 56, the outer waterproof sheet 60 and the ventilator A bonding area with the edge 56 can be secured. Moreover, when the extra length part extended in the building downward side rather than the edge part of the outer side waterproof sheet 60 and the outer surface part 56B of the ventilation trunk edge 56 on the building lower side is set, water and wind will be in the extra length part. It is conceivable that the state of adhesion between the outer waterproof sheet 60 and the ventilation trunk edge 56 cannot be maintained by spraying. However, in the present embodiment having the above-described configuration, it is possible to stably maintain the adhesive state between the outer waterproof sheet 60 and the ventilator rim 56 without being affected by water or wind. The adhesion state with the edge 56 can be secured.

  In the present embodiment, the one end 60A of the outer waterproof sheet 60 is sandwiched between the upper wall 38A and the heat insulating material 42 of the steel plate member 38, so that the one end 60A is in close contact with the upper wall 38A. ing. For this reason, in this embodiment, it can suppress that water permeates into the building upper side in the attic 46.

  Moreover, in this embodiment, the entrance corner part 42D and the exit corner part 36B in the peripheral part of the heat insulating material 42 are covered with the inner waterproof sheets 62 and 70, so that the entrance corner part 42D and the exit corner part 42C are blown up. In addition, the intrusion of water from the entrance corner 42D and the exit corner 42C to the attic 46 is suppressed. Further, the linear portion 42B at the peripheral edge portion of the heat insulating material 42 is covered with the outer waterproof sheet 60, and the outer waterproof sheet 60 is disposed so as to overlap the inner waterproof sheets 62 and 70 when viewed from the outdoor side. Air permeability by the edge 56 is ensured. Therefore, in the present embodiment, it is possible to achieve both the air permeability of the attic 46 and the waterproofness of the attic 46 corresponding to the shape of the roof portion 36.

  Further, in the present embodiment, the inner waterproof sheets 62 and 70 are molded products, and the shapes of the inner waterproof sheets 62 and 70 are made to correspond to the shapes of the entrance corner portion 42D and the exit corner portion 42C of the heat insulating material 42. Can do. As a result, in this embodiment, the waterproofness of the attic 46 can be improved in the protruding corner portion 36B and the entering corner portion 36C of the roof portion 36.

  Moreover, in this embodiment, the water which flows into the side wall part 38B of the steel plate accessory 38 from the upper side of the roof part 36 flows along the draining part 54A, and from the vent 66 provided on the building lower side of the draining part 54A. Water can be prevented from entering. As a result, in this embodiment, the intrusion of water flowing from the upper side of the building into the attic 46 side can be suppressed.

  In addition, in this embodiment, the eaves wall 48 is provided along the longitudinal direction of the side wall part 38B of the steel plate member 38 constituting the flat roof, and the upper part of the roof part 36 is not impaired without impairing the design of the building 10. Water flowing from the side to the side wall portion 38B of the steel plate accessory 38 can be drained. As a result, in the present embodiment, it is possible to achieve both of ensuring the design of the building 10 and suppressing the intrusion of water flowing from the upper side of the building into the attic 46 side.

<Supplementary explanation of the above embodiment>
(1) In the above-described embodiment, the one end portion 60A of the outer waterproof sheet 60 is sandwiched between the heat insulating material 42 and the upper wall portion 38A, but is not limited thereto. That is, if sufficient adhesion between the outer waterproof sheet 60 and the upper wall portion 38A of the steel plate accessory 38 can be secured, the one end portion 60A of the outer waterproof sheet 60 is directly connected to the heat insulating material 42 and the upper wall portion 38A. It may only be pinched. According to such a configuration, the installation work of the outer waterproof sheet 60 can be simplified.

  (2) In the above-described embodiment, the inner waterproof sheets 62 and 70 are molded products. However, according to the shape of the roof portion 36, the inner waterproof sheet 62, 70 may be manufactured. According to such a structure, it becomes possible to reduce cost, maintaining work efficiency.

10 building 22 outer wall 22A upper end part 36 roof part (roof)
38 Steel plate role (roof sheet material)
38A Upper wall part 38B Side wall part 42 Heat insulating material (roof member)
42B Straight part 42C Outer corner (corner)
42D Corner (corner)
44 Roof surface 46 Attic 48 Eaves 54A Drainage portion 56 Ventilation trunk edge 56A Inner surface (surface on the indoor side of the ventilation trunk edge)
56B outer surface (outer side surface of ventilator edge)
58 Ventilation groove (communication part)
60 Outside waterproof sheet (waterproof sheet)
60A One end 60B The other end 62 Inside waterproof sheet (waterproof sheet)
66 Vent (vent)
70 Inside waterproof sheet (waterproof sheet)

Claims (7)

The upper wall part constituting the roof surface of the roof of the building, and the peripheral edge part of the upper wall part, extending along the upper end part of the outer wall of the building and covering the upper end part from the outdoor side, A roof plate material configured to include the upper end portion and a side wall portion spaced apart from each other,
A ventilator rim formed between the side wall and the upper end, and formed with a communicating portion that communicates the attic side and the outdoor side of the building;
One end is fixed to the indoor side surface of the upper wall, and the other end is bonded to the outdoor side surface of the ventilator rim,
Building ventilation structure. The other end portion terminates at an end portion on the building lower side of the outdoor side surface of the ventilator rim,
The building ventilation structure according to claim 1. The one end portion is sandwiched between a roof member that constitutes the roof and is disposed on the building lower side of the upper wall portion and the upper wall portion,
The building ventilation structure according to claim 1 or 2. The waterproof sheet includes an inner waterproof sheet in which a corner portion at a peripheral edge portion of the roof member is covered from the outdoor side and the other end portion is bonded to an indoor side surface of the ventilator rim, and a linear portion at the peripheral edge portion. An outer waterproof sheet that covers from the outside and is arranged so as to overlap with the inner waterproof sheet when viewed from the outdoor side, and has the other end bonded to the outdoor side surface of the ventilator rim.
The ventilation structure of a building according to claim 3. The inner waterproof sheet is a molded product formed in accordance with the shape of the corner,
The ventilation structure of the building according to claim 4. The side wall portion includes the side wall portion and the outer wall, and is provided with a draining portion on the upper side of the building from the ventilation portion capable of ventilation to the attic side.
The ventilation structure of a building according to any one of claims 1 to 5. The roof is a flat roof, and eaves are provided along the longitudinal direction of the side wall.
The ventilation structure of the building according to claim 6.