JP4366383B2 - Outer wall structure with wooden outer insulation - Google Patents

Description

  The present invention relates to an outer wall structure of an outer heat insulation in which a wooden building is externally attached with a heat insulating composite panel, and more specifically, a formed thin rigid plate is layered on a heat insulating layer having a vertical groove group for ventilation. The present invention relates to a breathable outer wall structure in which a close-contacting and breathable heat-insulating composite panel is externally attached to the outer surface of a wooden frame using a metal fitting, and belongs to the technical field of wooden construction.

It has been conventionally used to externally heat insulating materials on wooden buildings to form external heat insulating buildings.
FIG. 8 cited as a prior art example 1 is an externally stretched wooden building, which is shown in Non-Patent Document 1, in which a heat insulating material is attached to an outer wall frame such as a pillar or a stud via a structural face material, The vertical ventilator rim is placed outside the heat insulating material, and the ventilator rim is fixed to the housing by a fixing nail penetrating the heat insulating material from above the rim, and the exterior base material is fixed on the ventilator rim. In addition to covering the wooden building with a heat insulating material, the space between the heat insulating material formed on the outer surface of the heat insulating material and the exterior base material is used as a ventilation layer, and the air flow is applied to the lower end of the outer wall. It is made to flow in and out from the drainage fitting, and flows out from the upper end of the outer wall to the outside through the eaves ceiling ventilation opening.

  Further, FIG. 9 cited as the conventional example 2 is an external thermal insulation method for a wooden building disclosed in Patent Document 1, in which a steel plate base material and a kraft paper covering material are foamed from a synthetic resin in an intermediate layer. This is an outer wall structure with an outer wall that employs a heat-insulating panel that is attached to the pillars and inter-columns with a fixture, and that has a heat-insulating panel that is integrally layered with solidified adhesive strength.

  FIG. 10 cited as Conventional Example 3 is disclosed in Patent Document 2, which was developed by the inventor of the present application and applied to the construction of an external insulation building of reinforced concrete by the applicant of the present application. As shown in FIG. 10 (A), a heat insulating composite panel having a 25 mm thick extruded cement board with a group of grooves for ventilation on the inner surface is integrally formed with a 75 mm thick plate heat insulating material. The cement board has a width of 490 mm, a heat insulation material width of 500 mm, and the cement board has a small step (10 mm) on one edge and a large step (20 mm) on the other edge. The groove has a depth of 13 mm and a width of 30 mm.

FIG. 10B of Conventional Example 3 is a modification of the breathable heat insulating composite panel shown in FIG. 10A and improves the ventilation function of the groove.
That is, on the surface of the heat insulating material to be layered with the cement board, a heat insulating material groove having the same width as the groove of the cement board and a depth of 10 mm is arranged oppositely, and the cement board groove and the heat insulating material groove are arranged. The depth of the groove for ventilation inside the composite panel, in which the cement board and the heat insulating material are layered and integrated with each other, is determined as follows: cement plate groove depth 13 mm + heat insulating material groove depth Although it is a composite panel having the same thickness as the composite panel in FIG. 10 (A), the depth of the ventilation groove is increased without increasing the cement plate thickness, and the depth of the air groove is 10 mm. It improves the flow-through function.
Foundation, Building Environment and Energy Conservation Organization, issued on June 1, 2002, “Explanation of Energy Conservation Standards for Houses”, 1st edition, pages 199-206, “6.4 Outer Thermal Insulation Method” Japanese Patent Laid-Open No. 11-159032 Utility Model Registration No. 3084180 (issued March 8, 2002)

[Problem of Conventional Example 1 (FIG. 8)]
In the external thermal insulation wall method disclosed in Non-Patent Document 1, as shown in FIG. 8, the ventilation layer is formed by arranging the ventilation drum edge on the heat insulation material and using the ventilation drum edge fixing nail. The construction of the ventilation structure with the desired function is required because the exterior base material (face material) is fixed to the ventilator edge with the exterior base material fixing nails. This is a complicated task.
In addition, during long-term durability, the nail creeps and the exterior base material hangs down, cracks and peels off the outer wall finishing material, and damages the outer wall.

In addition, when a large exterior finish material such as a tile is placed on the exterior base material, in order to prevent the exterior base material from sagging, the horizontal beam of the same thickness as the heat insulation material is appropriately spaced. It is necessary to arrange the inside of the inside, or to adopt a ventilation cylinder edge of the insulation material thickness + the ventilation layer thickness, and to fix the ventilation cylinder edge to the pillar with a nail. The arrangement of the trunk edge and the fixing work require skill, a lot of man-hours, and the workability of the outer heat insulating wall is poor.
In addition, since the surface of the plastic heat insulating material is deteriorated and peeled off due to the influence of ultraviolet rays, it is necessary to cover the surface of the heat insulating material with a moisture permeable waterproof sheet or the like to suppress the ultraviolet ray deterioration.

[Problem of Conventional Example 2 (FIG. 9)]
As shown in FIG. 9, the outer insulation method of the conventional example 2 is a factory-produced product in which a steel base material and a covering material such as kraft paper are integrally layered by the solidified adhesive force of a synthetic resin foam heat insulating layer. Because the heat insulation panel is externally attached to the wooden frame, only the heat insulation layer can be reasonably constructed, but the exterior base material and / or the exterior finish material must be attached outside the coating material. In the case of forming a ventilation layer on the outside of the heat insulation panel, the arrangement of the exterior base material and / or the exterior finish material on the outside of the panel is the same as that of the conventional example 1, and the construction is interposed between the trunk edges, Also in the conventional example 2, the construction of the breathable outer heat insulating outer wall has many man-hours and the workability is poor.

[Problem of Conventional Example 3 (FIG. 10)]
The breathable composite panel of Conventional Example 3 was developed by the inventor of the present invention in order to adopt a reinforced concrete exterior heat insulating building as a discarded frame of an outer wall. A composite panel made of cement, oxalic acid raw material, and fiber-based raw material, extruded into an autoclave-cured plate with a ventilation groove on one side, and layered integrally with a heat insulating material Is a dry contact type composite panel, but has a ventilation layer formed by a groove group on the inner surface of the panel.

  Therefore, the panel shown in FIG. 10 (A) of Conventional Example 3 has sufficient strength as a discarded frame of the concrete outer wall, but the cement board is a strip having a depth of 13 mm necessary for exhibiting the ventilation function. Because of the groove group, the cement board thickness is 25mm, and moreover, warpage is likely to occur in the manufacturing process, and the width of the cement board is avoided in order to avoid cracking during press working when wearing an integrated layer with a heat insulating material. Can not be formed wide, it is implemented in a width of 490mm.

Moreover, since the specific gravity of the cement board with the required rigidity as a concrete disposal frame is 1.8 to 2.0, the cement board itself is 35 kg / m ² and is heavy. A panel having a cement board with a height of 2840 mm and a width of 490 mm, a weight of about 1 kg and a layer of 75 mm thick plate-like heat insulating material has a weight of about 50 kg.
Therefore, since the panel is heavy and difficult to handle, and is small in width, the workability of connecting and fastening the panels to the outer wall is also poor.
In addition, the presence of ventilation grooves in the cement board, and the fact that the vertical connection of the panel must have a joint spacing between the upper and lower edges of the cement board, makes it possible to connect the vertical grooves between the panels. In order to secure the ventilation structure by the group, it is necessary to adopt a special ventilation backer developed by the present inventor.

Further, the panel shown in FIG. 10 (B) is proposed as a modified example of the panel of FIG. 10 (A), and is intended to increase the ventilation function by deepening the groove in the panel. With a cement plate thickness of 25 mm, a 75 mm insulation material is provided with a 10 mm deep groove that creates a heat insulation defect. The groove depth is 13 mm on the cement plate side + 10 mm on the insulation material side, for a total of 23 mm. However, when laminating a cement plate and a heat insulating plate, the integrated layering operation in the form of alignment between the mold-formed cement plate side groove and the notched heat insulating plate side groove is complicated and labor-intensive. It becomes an elaborate work with.
Accordingly, the panel shown in FIG. 10B can be deeper (23 mm) than the groove depth (13 mm) of the panel of FIG. 10A, and a slight improvement in ventilation function can be obtained. 75 mm thickness) caused a heat insulation defect due to a 10 mm thick groove, and since the outer heat insulation function was lowered and the laminating workability was poor, the implementation effect could not be expected. This is implemented in the type shown in FIG.

  The present invention solves or improves the problems of the conventional examples and provides a new outer construction method for wooden buildings, and is a lightweight and wide new breathability developed for wooden outer coverings. By adopting an outer heat insulating composite panel, the present invention provides an outer wall structure that is far easier to construct than a conventional wooden outer heat insulating method and has a high function.

The present invention, for example, as shown in FIG. 1, is an outer wall structure of a wooden outer heat insulation in which a breathable heat insulating composite panel is externally attached to an outer wall of a wooden building, and the composite panel 1 is a heat insulating layer of a foamed plastic heat insulating material. On the layer attachment surface 1S of 1B, the ventilation groove G and the thick part 1C for layer wearing are arranged in the vertical direction alternately so that both sides become the thick part 1C. is obtained by integrating layers wearing outer base sheet 1A of the plate to the layer deposition surface 1S of the heat insulating layer 1B, the lower end of the composite panel 1, as shown in FIG. 3 (a), a vertical piece 7W the foundation 14C, plastic It is supported by a horizontal piece 7F provided with an air hole H7 of a panel bracket 7 having an angle cross section fixed by a heat bridge blocking structure through a seat plate 8 and is held so that air can flow into the groove G group. The composite panel 1 is fixed to the wooden frame WF as an outer wall, and from the lower end of the composite panel 1 The air flow a rising in the groove G group, in which the releasable via Nokiten vent 21 from the upper end of the composite panel 1.

In this case, the plate-like heat insulating layer 1B of the foamed plastic-based heat insulating material may be a plate-like material having a shape-retaining property that can be integrally layered on the exterior base material 1A of a molded thin rigid plate, such as an extruded polystyrene foam or bead method. A foamed plastic-based heat insulating material of JISA9511 such as polystyrene foam and rigid urethane foam is good, and typically, an extruded polystyrene foam plate of JISA9511 having a thickness of 75 mm.
Further, the ventilation groove G group may be cut by a cutter to a depth that guarantees a minimum draft air flow a flow and keeps a heat insulation defect to a minimum. Has a depth of 15 mm and a width of 45 mm, and the width of the groove G and the width of the thick portion 1C are equal.

Further, the exterior base material 1A of the molded thin rigid plate may be a minimum thin rigid plate (cement plate) having strength, impact resistance, and dimensional stability as the exterior base material of the outer wall, and the plate thickness is 15 mm. It is the following: light weight (10 kg / m ² ), high strength (100 kgf / cm ² ), mainly composed of magnesium oxide and cinnabar sand and embedded with glass fiber nonwoven fabric (Gc) on both sides, as shown in FIG. ) 12mm-thick magnesium cement plate 1A-1; as shown in FIG. 7 (C), sand and slaked lime, pulp is dispersed in water and formed into layers in the manner of spreading paper, and combined with calcium generated by autoclave curing A calcium silicate plate 1A-2 having a light weight (13.2 kg / m ² ), a high strength (100 kgf / cm ² ) and a thickness of 12 mm, which is obtained by adding vermiculite (Va) to the base material of calcium oxalate produced as described above; Volcanic gravel (7) A light weight (12.4 kg / m ² ), high strength (100 kgf / cm ² ), 13 mm thick phenolic resin plate using Ka) and fly ash as raw materials and hardened with phenolic resin using glass fiber as a reinforcing material 1A-3 is preferred.

Further, the air inflow into the groove G at the lower end of the composite panel 1 can be achieved even if the air hole H7 is disposed at a position corresponding to the groove G of the panel bracket 7 that supports the composite panel 1 as shown in FIG. ), A transverse groove G ′ communicating with the groove G group is formed in the composite panel 1, and the panel groove is arranged on the transverse groove G ′ having a port function with respect to the groove G group. The air hole H7 may allow air to flow in.
Then, as shown in FIG. 3, in the panel bracket 7 having an angle section, the vertical piece 7W is firmly fixed to the base 14C via the plastic seat plate 8 with a thermal bridge prevention structure, and the air hole H7 is formed. Since the provided horizontal piece 7F supports the lower end of the composite panel 1, the panel bracket 7 firmly supports the composite panel 1 without forming a thermal bridge to the wooden building skeleton WF. Ensures ventilation function.
Therefore, the breathable heat-insulating composite panel 1 provided with a ventilation layer formed by the grooves G in the interior is supported by the panel receiving bracket 7 at the lower end, and is fixed to a column of the housing WF with a long screw 4A, or the composite panel 1 By simply bonding and fixing the heat insulation layer 1B surface to the structural surface material 13 stretched on the housing WF, the outer wall of the wooden building can be constructed to be a breathable external heat insulation that suppresses the thermal bridge action. The outer wall of the breathable heat insulation of the wooden outer layer can be obtained by a much simpler and better workability than the existing wooden outer wall thermal insulation method.

Moreover, since the composite panel 1 is a homogenous product produced at the factory, and the work of attaching the composite panel 1 to the wooden frame is a simple operation that does not cause variations in the product, the wooden structure attached with the composite panel 1 is used. The outer wall structure of the outer layer becomes a breathable outer layer heat insulating structure that is reliable in quality.
In addition, the cement board (exterior base material) 1A is thin and lightweight, so the unit area is much lighter than the composite panel of Conventional Example 3, and it is easy to handle as a wide (standard: 900 mm) panel. Combined with the reduction in the number of panels, the construction period can be shortened.

Further, since the grooves G for ventilation are arranged only in the heat insulating layer 1B, the width and depth of the grooves can be freely set by adjusting the dimensions of the cutter itself before the composite panel 1 is deposited. A desired bypass groove, a transverse groove, etc. for the G group can be freely attached.
Since the cement plate 1A is simply a thin and rigid plate, various lightweight thin and rigid plates can be used, and a composite panel can be freely formed from a functional aspect, an application aspect, and a design aspect.
In addition, since the groove G for ventilation in the composite panel 1 is formed only on the heat insulating layer 1B side, as shown in FIG. 4B, the heat insulation of the upper and lower panels 1 is provided at the connection portion of the upper and lower panels. By simply abutting the layers 1B against each other, the upper and lower grooves G are connected to each other, and as shown in FIG. 1, the draft rising air flow a is also released from the cement plate 1A at the upper end of the panel. It becomes discharge | release from the groove G group in the exposed surface of the heat insulation layer 1B, and it becomes easy to ensure the distribution path | route of the draft raising airflow a.

Further, in the present invention, as shown in FIG. 3, panel pivot bracket 7 is an angle form, e Bei horizontal plate 7F air holes H7, a vertical piece 7W to the soil block 14C, plastic interposed the seat plate 8, will lock with thermal bridge blocking structure is also a requirement.
In this case, the panel bracket 7 is typically a 7 mm thick JISG 3192 unequal side angle steel, and has a water piece 7G on the lower surface of the front end of the horizontal piece 7F.
Further, the air hole H7 may ensure air inflow into the groove G group of the panel 1.

Further, the horizontal piece 7F of the panel bracket 7 is advantageous in filling the sealing 12 if the tip upper surface has a curved surface 7R for flowing rainwater and protrudes from the exterior finishing material 2 attached to the surface of the exterior base material 1A. And show a sense of stability.
Accordingly, the panel bracket 7 that is firmly fixed to the base 14C guarantees the strong support of the composite panel 1 and introduces the draft rising air flow a from the lower end of the composite panel 1 to the groove G group. Guarantees the heat insulation function and ventilation function of the outer wall.
And by fixing the panel bracket 7 to the base 14C via the plastic seat plate 8, the thermal bridge from the panel bracket 7 to the housing WF can also be suppressed.

Further, in the present invention, as shown in FIG. 3, the composite panel 1 placed on the panel bracket 7 is provided with a transverse groove G ′ that communicates with the lower end of the groove G group. It is preferable that an air hole H7 disposed in the horizontal piece 7F communicates with the transverse groove G ′.
In this case, the transverse groove G ′ may be formed with a cutter at the same time when the longitudinal steel group G is notched with a cutter (not shown) in the heat insulating layer 1B when the composite panel 1 is formed. The depth and width of the groove G ′ may be formed with the same dimensions as the groove G.

  Therefore, as shown in FIG. 3A, the composite panel 1 whose lower end is supported by the horizontal piece 7F of the panel bracket 7 crosses the entire width of the heat insulating layer 1B at the lower end of the longitudinal groove G group. Since the groove G ′ has a port function for each groove G, the air hole H7 of the panel bracket 7 for allowing the air flow a to flow into the transverse groove G ′ is appropriately positioned in the transverse groove G ′. In addition, it is only necessary to communicate in the form of a free hole such as a round hole or a long hole, and the perforation arrangement of the air hole H7 to the horizontal piece 7F of the panel bracket 7 is arranged while suppressing the strength reduction of the horizontal piece 7F. And drilling work becomes easy.

Further, as shown in FIG. 1, the composite panel 1 has a structural face member 13 stretched on the outer surface of the pillars 14 </ b> A and 14 </ b> B of the wooden frame WF, and the composite panel 1 is stretched integrally on the outer surface of the structural face member 13. It is preferable to do this.
In this case, the structural face material 13 may be stretched in the same manner as in Conventional Example 1 (FIG. 8) by a conventional technique.
In addition, the tensioning of the composite panel 1 of the present invention to the wooden frame WF does not require the arrangement of the ventilator edge + the cross rail as in the conventional example 1, and therefore, it may be simply integrated with the structural surface material 13. .
Therefore, it is possible to stretch the composite panel 1 to the wooden frame WF by supporting the panel receiving bracket 7 at the lower end and bonding and integrating the structural heat insulating layer 1B on the inner surface of the panel with the structural face material 13; Since the panel 1 can be assigned to the outer wall W without being restricted by the arrangement positions of the columns 14A and the inter-columns 14B, the composite panel 1 can be stretched with good workability.

  Further, in the outer wall structure of the present invention, the upper and lower connections of the composite panel 1 are, as shown in FIG. 4B, a large step d3 protrusion with respect to the cement plate 1A of the heat insulating layer 1B at the upper end of the lower composite panel 1. When the lower end of the upper composite panel 1 enters the small step d2 of the heat insulating layer 1B with respect to the cement plate 1A, the heat insulating layer 1B abuts against each other, and the lower cement plate upper end eu and the upper cement plate lower end It is preferable that the flat backup material 12B is abutted and extended on the front surface of the heat insulating layer 1B and the front surface of the backup material 12B is filled with the sealing 12 to form the horizontal joint dx at the joint interval d2 with ed.

  In this case, for example, when the upper and lower panels of the first floor panel and the second floor panel are joined, as shown in FIG. 6 (A), the heat insulation layer 1B is d3 (standard: 40 mm) from the cement board 1A. As shown in FIG. 4 (B), if the lower end of the second floor panel is protruded and the heat insulation layer 1B is inserted d2 (standard: 20 mm) from the cement board 1A as shown in FIG. 6 (B), A horizontal joint dx interval of an interval d2 (standard: 20 mm) can be formed between the upper side eu of the cement plate of the lower panel and the lower end ed of the cement plate of the upper panel.

As shown in FIG. 4 (B), the horizontal contact interface hf of the heat insulating layers of the upper and lower panels is protected by the inner surface of the cement board 1A, so that a decrease in the heat insulating function due to the inflow of air can be suppressed, and the grooves G are insulated. Since it is arranged only on the layer 1B side, the abutment contact between the heat insulating layers 1B of the upper and lower panels makes the groove groups G of the upper and lower panels communicate with each other, and the grooves at the intervals of the horizontal joints dx of the heat insulating layer 1B. By simply closing the exposed part of the G group, the air communication of the groove group G of the upper and lower panels can be guaranteed.
Thus, the upper and lower cement plate spacing d2 (joint spacing), conventional, only Hama charge of ceiling 12 through the flat backup material 12B, breathable structure securing panel upper and lower connection portion becomes possible, in a conventional cement board Compared with the vertical connection between the upper and lower cement plates at the joint interval between the composite panels (Fig. 10) having the groove, it is possible to secure the ventilation structure much more simply and reliably.

In the present invention, as shown in FIG. 2B, the left and right connection of the composite panel 1 is performed by abutting contact between the heat insulating layer 1B protruding from the small step d1 and the heat insulating layer 1B entering the small step d1. Thus, it is preferable to connect the left and right composite panels 1 with each other.
In this case, when the composite panel 1 is manufactured, as shown in FIG. 7A, the heat insulation layer 1B and the cement board 1A having the same width may be layered with a small step difference d1. The heat insulation layer width BW is 900 mm, the cement board width AW is 900 mm, and the small step d1 is 10 mm.

Accordingly, since the parallel connection between the composite panels 1 is a phase-missing connection, the abutting contact operation between the panels 1 is easy, and the abutting vertical contact interface Vf between the heat insulating layers 1B is the cement plate 1A. It is protected by, and the heat insulation function decline by the air inflow can be suppressed.
As shown in FIG. 1, when the composite panel 1 is stretched on the structural face material 13, the connection portion J13 between the structural face materials 13 and the vertical contact interface Vf between the composite panel 1 Arranging so as not to overlap is advantageous in improving the airtightness of the outer wall.

Further, in the present invention, as shown in FIG. 5, the composite panel 1 on the lower side of the window 10 has a transverse groove G ′ communicating with the groove G group at the upper end of the heat insulating layer 1B. The composite panel 1 on the upper side of the window 10 has a transverse groove G ′ communicating with the groove G group at the lower end of the heat insulating layer 1B, and an air flow a rising in the composite panel 1 on the lower side of the window is generated. It is preferable to bypass the outside of the window rigid frame 10C and flow into the groove G group in the composite panel 1 on the upper side of the window.
In this case, the upper and lower transverse grooves G ′ of the window 10 may be communicated with the outer vertical grooves G of the window rigid frame 10C as shown in FIG.
Therefore, both the transverse groove G ′ of the lower panel of the window 10 and the transverse groove G ′ of the upper panel perform the port function to each groove G group. Therefore, the window lower frame 10B and the window upper frame 10A In the upper and lower composite panel inner groove G group which has been cut off, the ascending air flow a from all below can flow through, and the entire outer wall becomes air-permeable outer heat insulation.

The composite panel 1, the thick portion 1C of the heat insulating layer 1B accounted for 50% of the area on the layer adhesive surface 1S, exterior base sheet 1A, the thickness T2 is 12~13mm
The specific gravity is preferably 0.8 to 1.1 and the bending strength is preferably 100 to 120 kgf / cm ² .
In this case, an exterior base material having a thickness T2 of 12 to 13 mm, a specific gravity of 0.8 to 1.1, and a bending strength of 100 to 120 kgf / cm ² is typically shown in FIG. Magnesium cement plate 1A-1 shown in FIG. 7, calcium silicate plate 1A-2 shown in FIG. 7C, and phenol resin plate 1A-3 shown in FIG. 7D.
If the thick part 1C occupies an area of 50% of the layering surface 1S, an integrated layered structure that maintains a sufficient adhesive force is obtained, and the thick part 1C exists on both sides of the heat insulating layer 1B. In addition, delamination does not occur in the handling process of the composite panel.

Further, by the 50% of the area of the layer deposition surface 1S of the heat insulating layer 1B and the thick portion 1C of the layer worn, releasing water vapor (moisture) from the heat insulating layer 1B, and, over the exterior base material 1A The ventilation groove G for cooling the heating also occupies a half of the area 1S of the heat insulating layer 1B, and the arrangement of the grooves G group is appropriately dispersed as shown in FIG. If it arranges, it will become a composite panel which can expect the uniform ventilation effect to the whole panel surface stuck as an outer wall.

Thus, the outer base member (cement board) 1A, taken as 1 m ² per weight of 9～15Kg, Conventional Example 3 extruded cement plate (Figure 10) half of the following (35.0kg / m ²⁾ Because of the weight, the composite panel 1 used in the present invention is lighter than the conventional composite panel even if the cement board 1A is made wider (900 mm) than the cement board width (490 mm) of the conventional composite panel. As a result, handling of the composite panel at the construction site becomes easy and workability is improved.
And if it has the intensity | strength of 100-120 kgf / cm < ² >, the intensity | strength as a structural material of a panel will be enough, and sufficient intensity | strength will be exhibited as an exterior base material.

In the composite panel 1, as shown in FIG. 7A, the thickness T3 of the heat insulating layer 1B is 75 mm, the depth Gd of the groove G is 12 to 20 mm, and the groove width a1 is 45 mm. Is preferred.
In this case, as shown in FIG. 7A, if the groove width a1 is 45 mm, the width a2 of the thick portion 1C is also 45 mm, so that the thickness of 45 mm is obtained when the composite panels 1 are connected in parallel. The outer wall surface of the composite panel 1 has a uniform moisture-releasing function from the heat insulating layer 1B and a uniform ventilation through the entire surface. The uniform endothermic cooling function of the base material 1A is exhibited.

Further, the thickness of the heat insulating layer 1B may be determined so that the heat flow resistance (Rt) of the wooden outer wall integrated with the coating satisfies the specified value (the standard of the heat flow rate of the wall in the next generation energy saving standard). The standard of the I district (Hokkaido), which has the strictest standard values in Japan, has a heat flow resistance Rt (m ² h ° C / kcal) of 2.86 m ² h ° C / kcal or more (other than reinforced concrete structures, etc.) The outer wall with a heat insulation layer 1B with a thickness of 75 mm and a thermal conductivity of 0.024 kcal / mh ° C. or less is attached to a wooden outer wall provided with an interior surface material and a structural surface material. Even if the groove G is formed with a depth of 20 mm and a heat insulation defect having a depth of 20 mm is generated in the heat insulation layer 1B having a thickness of 75 mm, the standard value of the I region of Japan (Hokkaido) is still satisfied.

Further, the depth Gd of the groove G is up to 40 mm at which the maximum flow velocity of the draft rising air flow is obtained, and the flow velocity of the rising air flow increases as the groove depth Gd increases. The larger the groove depth Gd in 1B, the larger the heat insulation defect, and the heat insulation defect due to the groove G in the heat insulation layer 1B and the ventilation function are in a trade-off relationship, but the depth Gd of each groove G is If it is 12 mm, the adiabatic defect is negligible and a minimum effective draft air flow velocity ≈ 0.026 m / s is obtained. If Gd is 20 mm, the adiabatic defect is close to the allowable limit value. A high draft air flow rate (≈0.034 m / s) is obtained.
Therefore, since the groove depth Gd is selected to be 12 to 20 mm in the 75 mm thick heat insulating layer 1B to which the foamed plastic heat insulating material of JISA9511 is applied, the deterioration of the heat insulating function due to the heat insulating defect is suppressed within an allowable range, and The required draft rising air flow a as an air-permeable layer can be generated at an effective speed.

In the outer wall structure of the present invention, the lower end of the breathable insulation composite panel 1, and supported by a horizontal piece 7F panel receiving brackets 7 fixed with thermal bridge blocking structure on the base 14C, the outer wall of the tree Zomukurotai WF Just by stretching, the wooden building can be covered with the heat insulation layer 1B to suppress the thermal bridge effect , and the draft rises at the interface between the outer surface of the heat insulation layer 1B and the exterior base material (cement board) 1A. Since the ventilation layer through which the air flow a flows can be formed by the vertical groove G group, it can be constructed with a much simpler and simpler work with better workability than the conventional wooden outer wall insulation method (FIG. 8).
Moreover, since the composite panel 1 is a factory-produced product and there is little variation in quality due to construction work, the outer wall structure of the wooden building obtained by the present invention is more than the outer wall structure obtained by the conventional method (FIG. 8), In terms of heat insulation function and ventilation function, it will be uniform, high quality and reliable.

  Further, since the ventilation groove G group of the composite panel 1 is arranged only in the heat insulating layer 1B in the panel manufacturing process, the trouble of the heat insulating defect with respect to the thickness of the heat insulating layer 1B is suppressed within an allowable range, and the draft rising air flow Under conditions that cause a suitable flow rate of a, for example, it is desirable to minimize heat insulation defects and at the same time lower the ventilation function, or to make the heat insulation function excellent with the heat insulation defect as an allowable limit value. Depending on the situation, it can be cut out freely with a cutter, and by selecting a composite panel appropriately from both sides of the heat insulation function and the ventilation function, it is possible to construct an external heat insulation wooden house according to the construction area and the demand of the customer.

Moreover, since the groove G as the ventilation layer of the composite panel 1 exists only in the heat insulating layer 1B, when the composite panel 1 is vertically connected, such as two stories, three stories, etc. It is easy to ensure the communication structure of the groove G by the heat insulation layer abutting which is essential for the mutual abutting contact.
Moreover, since the exterior base material (cement board) 1A of the composite panel 1 can be selectively used as long as it is a light thin rigid plate, it can meet the demands of the customer and is applied to the outer surface of the exterior base material 1A. The exterior finishing material 2 can also be selected by the customer, and the outer wall structure of the outer wall can be freely adapted to the preference of the customer in terms of function, design and cost.

[Composite panel (Fig. 6, Fig. 7)]
The composite panel 1 is externally attached to the wooden frame WF. FIG. 6 (A) is a perspective view of a panel for the first floor, and FIG. 6 (B) is a perspective view of a panel for the second floor. The panel 1 that is externally attached to the general wall portion is different between the first floor (lower floor) and the second floor (upper floor) at the upper and lower ends of the panel, but the cross-sectional structure is the same.
That is, as shown in FIG. 7A, the composite panel 1 has a width GW of 900 mm and a thickness T3 of 75 mm and a rigid urethane foam (JISA9511) heat-insulating layer 1B having a depth Gd of 15 mm. In the groove G group having a width a1 of 45 mm, a thick part 1C having a width a2 of 45 mm exists between the grooves G, and a thick part 1C having a width a3 of 22.5 mm at both ends. Each of the grooves G is penetrated in the vertical direction (length direction) with a cutter so that there is a gap, and a magnesium cement plate having a width AW of 900 mm and a thickness T2 of 12 mm on the surface 1S of the heat insulating layer 1B. 1A-1 is layered and integrated by shifting d1 (10 mm) in the left-right width direction.

In the standard panel, the first-floor heat insulation layer 1B and the second-floor heat insulation layer 1B have the same width BW (900 mm) and the same height Bh (2832 mm), and the exterior base material 1A is suitable for the first floor. As shown in FIG. 6A, the upper end of the heat insulating layer 1B is d3 (40 mm) from the heat insulating layer 1B and the lower end is d1 (10 mm). As shown in FIG. 6B, it is assumed that the cement board 1A has an upper end entering d3 (40 mm) and a lower end protruding d2 (20 mm) with respect to the heat insulating layer 1B.
Further, as shown in FIG. 3 (A), a transverse groove G ′ that transversely penetrates the longitudinal groove group G is provided at the lower end of the layering surface of the heat insulating layer 1B of the composite panel 1 for the first floor. The same width and the same depth as the port to each groove G are formed at the same time when the groove G is notched with a cutter.

[Composite panel for windows (Figure 5)]
The composite panel 1 arranged above and below the window 10 is formed by processing the general wall composite panel shown in FIG. 6 and FIG. 7 according to the panel layout diagram of the outer wall, and as shown in FIG. In the panel 1 on the lower side of the window 10, the heat insulating layer 1B and the exterior base material 1A are flush with each other at the upper end of the panel, and the groove G group is communicated with the upper end of the heat insulating layer 1B. An exterior base material piece 1A in which a transverse groove G ′ for performing a port function to G is arranged and the exterior base material 1A is cut into a thickness of 87 mm (heat insulation layer thickness 75 mm + exterior base material thickness 12 mm) of the composite panel 1 The top surface of the panel is covered with '.
Further, even in the composite panel 1 on the upper side of the window 10, the lower end of the panel is flush, and the groove G group is communicated with the lower end of the heat insulating layer 1B to provide a port function to each groove G. The transverse groove G ′ is arranged, and the lower end surface of the panel is covered with the exterior base material piece 1A ′.

[Basic composite panel (Fig. 1, Fig. 3)]
As shown in FIG. 1, the foundation composite panel 1 ′ is an outer insulation coating for the concrete foundation rising portion 5 below the panel bracket 7, and is the same quality as the insulation layer 1 </ b> B of the composite panel 1 and has a thickness of 50 mm ( The cement board 1A is layered and integrated with the foamed plastic heat insulating layer 1B ′ of T3 ′), and the panel height is prepared according to the height of the foundation rising portion 5 of the building.
The upper end of the base composite panel 1 ′ is flush with the cement board 1A and the heat insulating layer 1B ′, and the cement board 1A and the heat insulating layer 1B having the same width are placed on the left and right sides as in the case of the composite panel 1 for a general wall. The layers are integrated in layers by shifting them 10 mm in the left-right direction so that they can be phase-bonded.

[Panel bracket (Fig. 3)]
As shown in FIG. 3 (A), the panel bracket 7 is a long metal piece that stably supports the lower end of the composite panel 1 on the outer wall for a long period of time. FIG. FIG. 3B is a perspective view of a panel bracket, and FIG. 3C is a perspective view of a seat plate used together with the panel bracket.
That is, the panel bracket 7 is a long piece of unequal side angle iron (JIS G3192) having a thickness of 7 mm, and having a vertical piece 7W having a height of 75 mm and a horizontal piece 7F having a width of 100 mm. At the center in the height direction, bolt insertion holes H7 'with a diameter of 13.5mm are provided at intervals of 1200mm, and air holes with a diameter of 15mm are provided at the abutting position of the transverse groove G' of the composite panel 1 on the horizontal piece 7F. H7 is perforated at an appropriate interval (standard: 150 mm), and a horizontal piece 7F is provided with a curved surface 7R for flowing rain water on the upper surface of the front end and a water slice 7G having a protruding length of 7 mm on the lower surface of the front end.
Further, as shown in FIG. 3 (C), the seat plate 8 is used as the same thickness as the structural face material 13 (12 mm thick) so as to overlap with the vertical piece 7W of the panel bracket 7. It is a plastic plate member 8W, and is provided with a long hole H8 having a width of 15 mm for inserting the fixing bolt 7B.

[Formation of foundation concrete frame (Figs. 1 and 3)]
When placing foundation concrete, the foundation composite panel 1 'is used as a concrete outer formwork by chipping in parallel phases. Together with the inner formwork of plywood, the foundation of thickness T5 (120mm) is used by the conventional formwork method. As shown in FIG. 3 (A), the form of the rising portion 5 is constructed, and the fall prevention anchor 4C and the anchor bolt 7D at the tip of the fixing bolt 4B inserted through the basic composite panel 1 ′ are embedded in the form. When the concrete is cast and the formwork is disassembled after the concrete is solidified, the foundation composite panel 1 'is secured to the concrete foundation by the fixing bolts 4B secured by the fall-preventing anchor 4C embedded in the concrete foundation rising portion 5. It is integrally fixed to the outer surface of the rising portion 5.

In this case, since the foundation composite panels 1 ′ are in a phase-separated connection, the outflow of the cast concrete to the outer surface of the foundation composite panel 1 ′ can be suppressed, and contamination of the outer surface of the foundation panel can be suppressed.
Next, a heat insulating material 6A having the same quality and a thickness of 15 mm (d4) is attached to the upper surface of the heat insulating layer 1B ′ of the basic composite panel 1 ′ with a plastic nail SP to form a front mold frame, and on the rear side, a plywood for mold frame (not shown). Is placed on the rear surface of the foundation rising portion, the top end of the concrete foundation rising portion 5 is filled with the mortar 14D, and the top edge of the foundation rising portion 5 is adjusted to be uneven.

[Construction of wooden frame (Figs. 1 and 2)]
A base 14C made of wood having a square cross section is arranged in the center of the width on the leveling mortar 14D of the concrete foundation rising portion 5, and as shown in FIG. 3 (A), by fastening with a washer 7C and an anchor bolt 7D with a nut 7E. The base 14 </ b> C is fixed on the foundation rising portion 5.
Then, by a conventional means, the first floor pillar 14A is erected on the base 14C, the trunk difference 18A is disposed on the pillar 14A, and the second floor pillar 14A is erected on the trunk difference 18A. A spar 18B is disposed on 14A, and then a wooden outer wall W is formed by disposing a stud 14B between the base 14C and the trunk difference 18A, and between the trunk difference 18A and the spar 18B.

Further, as shown in FIG. 3 (A), the bottom surface of the horizontal piece 7F of the panel bracket 7 in the form of an angle on the heat insulating material 6A and the leveling mortar 14D placed on the heat insulating layer 1B 'of the basic composite panel 1'. And the vertical bracket 7W is fastened to the base 14C with a fixing bolt 7B having a diameter of 12 mm and a length of 90 mm through the plastic seat plate 8 on the base 14C.
In this case, the thickness of the seat plate 8 overlaps with the vertical piece 7W and is the same as the thickness of the structural face material 13. If the structural face material 13 is 12 mm thick, the plastic plate material 8W is 5 mm. Thickness should be adopted.
Then, a 12-mm-thick structural face material 13 is attached to the outer wall W such as the pillar 14A and the inter-column 14B from the upper surface of the vertical piece 7W of the panel bracket 7 to the field plywood 19B on the lower surface of the roof with a 36-mm long screw. And the joining part of the structural face material 13 and the joining part of the upper end of the structural face material 13 and the field plywood 19B adhere the conventional airtight tape 11, and hold | maintain airtightness.

[Tensioning of composite panel (Figs. 1, 2, 3, 4)]
FIG. 1 is a longitudinal sectional view of an outer wall structure in a state where the present invention is applied to a two-story wooden house.
As shown in FIG. 3A, the lower composite panel 1 is stretched by a notch C7 for receiving the protruding portion of the fixing bolt 7B of the panel bracket 7 on the rear surface of the lower end of the heat insulating layer 1B of the composite panel 1. And the head of the fixing bolt 7B is housed in the notch C7, the composite panel 1 is placed on the horizontal piece 7F of the panel bracket 7, and the rear surface of the panel heat insulating layer 1B is placed on the front surface of the structural surface material 13 and the vertical surface. It contacts the front surface of the piece 7W.
Then, the long screw 4A is inserted into the bolt insertion hole hb drilled in the thick part 1C of the panel 1, and the long screw 4A passes through the composite panel 1 and the structural face material 13 as shown in FIG. Then, it fastens to the column 14A and the intermediate column 14B.
In this case, if the course thread (trade name) of Sanko Techno Co., Ltd. having a diameter of 5.3 mm and a length of 130 mm is adopted as the long screw 4A, the long screw 4A is a steel round nail for woodwork of JIS A5508. Since it has 5 times the strength of (allowable shear strength: 70 kgf / piece), the use interval of the long screw 4A can be widened, and the long screw 4A can be prevented from being split by the long screw 4A, and the workability is also good.

In addition, the left and right connections and the upper and lower connections between the composite panels 1 are performed by a phase-missing connection by abutting contact between the heat insulating layers 1B.
At the upper and lower joints of the second floor composite panel 1 to the first floor composite panel 1, as shown in FIG. 4 (B), the interval between the lower cement board upper edge eu and the upper cement board lower edge ed, The horizontal joint dx interval is generated. In this dx interval, a flat plate-shaped backup material 12B for conventional joints is extended and disposed on the front surface of the heat insulating layer 1B, and the front surface of the backup material 12B is formed by a conventional sealing 12. The lower composite panel groove group G and the upper composite panel groove group G are used as a sealed air flow path.

Further, at the lower end of the composite panel 1 on the first floor, the cement plate 1A enters d1 (10 mm) from the heat insulating layer 1B, so that d1 (between the lower end side ed of the cement plate 1A and the upper surface of the horizontal piece 7F of the panel bracket. 10 mm), the gap crosses the ventilation backer 12C in which the partition plates CP are arranged at regular intervals between the parallel side plates cf as shown in FIG. 3 (D). It arrange | positions on the horizontal piece 7F in the groove G ', and the sealing 12 is filled with the front surface of this ventilation backer 12C.
In this case, the width of the transverse groove G ′, that is, the height in FIG. 3A is the same as the width of 45 mm of the groove G, so that the upper portion of the ventilation backer 12C is a port for the vertical grooves G group. It becomes.

Further, at the upper end of the composite panel 1, as shown in FIG. 4 (A), a heat insulating material 6B having the same thickness as the heat insulating layer thickness T3 (75 mm) is disposed at the upper end of the heat insulating layer 1B. 6B is sealed with a conventional airtight tape 11 between the structural face material 13 and the field plywood 19B, and between the heat insulating material 6B and the upper end of the panel heat insulating layer 1B.
And the elevating airflow a discharge | released from the groove G group of the heat insulation layer 1B protruded from the cement board 1A in the upper end of the composite panel 1 is arranged in the eaves finishing material 20A stretched around the roof edge 20B It can be discharged from the top ventilation port 21.
The roof structure is similar to the roof of the conventional example 1 (FIG. 8), in which two heat insulation layers 19D are arranged on the plywood 19B disposed on the field rafter 19A via the base trunk edge 19G. What is necessary is just to be able to distribute | circulate air to the ventilation layer AL between the heat insulation layer 19D and the roofing 19E from the nose cover 20C, 20C 'of the eaves to the ridge.

Further, in the window portion, as shown in FIG. 5 (A), between the pillars 14A of the wooden outer wall, a window lintel 18C of a horizontal member is provided on the upper side of the window 10, and a window base 18D is provided on the lower side. Arrangement is made to reinforce the window, and on the rear side of the window frame, the exterior base material piece 1A ′ at the upper end of the window lower panel 1 is fixed to the protruding piece 10E of the window lower frame with a screw S, and the window upper panel 1 The exterior base material piece 1A ′ at the lower end is fixed to the protruding piece 10E of the window upper frame with a screw S, and at the center part of the window frame, the protruding piece 10E rising from the center of the upper surface of the window upper frame 10A and the lower surface of the window lower frame 10B The protruding piece 10E hanging from the center and the exterior base material 1A of the panel 1 are fixed with screws S.
The gap between the window frame four-round and the panel exterior base material 1A is filled with the sealing 12 via the conventional backup material 12B, and the frame 10D is provided on the inner side of the window frame for extending the interior surface material 17C. Deploy.

[Others]
In the embodiment, the present invention is applied to a wooden two-story building. However, it is obvious to those skilled in the art that the present invention can be applied to a wooden one-story building and a wooden three-story building.
In addition, in the embodiment, the ventilation backer 12C is disposed in the transverse groove G ′ at the lower end of the composite panel 1 as a means for allowing air to flow into the composite panel 1 of the panel bracket 7. If the distance d1 (standard: 10 mm) with the horizontal piece 7F of the panel bracket is about 3 mm, the distance d1 can be reduced without interfering with the transverse groove G ′ by a conventional sealing technique even without the ventilation backer 12C. Sealing filling is possible.

  In the embodiment, the composite panel 1 is fixed to the wooden frame WF by fixing the long screws 4A to the pillars 14A and 14B. However, the structural face material 13 of the wooden frame WF is the columns 14A and 14B. Since the composite panel is lightweight and the lower end is supported by the panel bracket, the heat insulation layer 1B surface of the composite panel 1 is adhered to the structural surface material 13 It is also possible to do.

It is a partial notch longitudinal cross-sectional view of the outer wall structure of this invention. It is explanatory drawing of this outer wall, Comprising: (A) is a notch perspective view, (B) is a cross-sectional view. It is panel support explanatory drawing, (A) is a support state longitudinal cross-sectional view, (B) is a perspective view of a panel bracket, (C) is a seat plate perspective view, (D) is a ventilation backer perspective view. It is a principal part longitudinal cross-sectional view of an outer wall, Comprising: (A) is a panel upper end part, (B) is a figure which shows a panel up-down junction part. It is explanatory drawing of a window part, Comprising: (A) is a longitudinal cross-sectional view, (B) is a partially notched top view. It is explanatory drawing perspective view, Comprising: (A) is a figure for 1st floor panels, (B) is a figure which shows the panel for 2nd floors. BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing of a panel, (A) is a cross-sectional view, (B), (C), (D) is the B section enlarged view of the figure (A) which each employ | adopted a different cement board, (E ) Is a front view of the first floor panel, and (F) is a front view of the second floor panel. It is explanatory drawing of the prior art example 1. FIG. It is explanatory drawing of the prior art example 2, Comprising: (A) is a panel perspective view, (B) is a construction method explanatory drawing, (C) is an outer wall perspective view, (D) is a principal part cross-sectional view. It is explanatory drawing of the prior art example 3, Comprising: (A) is a cross-sectional view of a panel, (B) is a cross-sectional view of a modification.

Explanation of symbols

1 Composite panel (panel)
1 'basic composite panel 1A exterior base material (cement board)
1A-1 Magnesium cement board (exterior base material, cement board)
1A-2 Calcium silicate board (exterior base material, cement board)
1A-3 Phenolic resin board (exterior base material, cement board)
1A 'exterior base material piece (cement board piece)
1B, 1B 'Heat insulation layer 1C Thick part 1S Layer surface 2 Exterior finishing material 3A Glass net 3B, 4M Resin mortar 4A Long screw 4B, 7B Fixing bolt 4C Fall prevention anchor 5 Foundation rising part (concrete foundation rising part)
6A, 6B Heat insulation material 7 Panel bracket 7C Washer 7D Anchor bolt 7E Nut 7F Horizontal piece 7G Water section 7R Curved piece 7W Vertical piece 8 Seat plate (plastic seat plate)
8W board (plastic board)
10 Window 10A Upper frame 10B Lower frame 10C Hard frame (window rigid frame)
10D Frame 10E Projection piece

DESCRIPTION OF SYMBOLS 11 Airtight tape 12 Sealing 12B Backup material 12C Ventilation backer 13 Structural surface material 14A Pillar 14B Space pillar (pillar)
14C foundation 14D leveling mortar 17C interior surface 18A trunk difference 18B span girder 18C window lintel 18D window base 19A field base rafter 19B field plywood 19C ventilation trunk edge 19D insulation layer 19E roofing edge 19G ground trunk edge 20A eaves finishing material 20B field Edge 20C, 20C 'Nasal concealment 21 Eaves ventilating port AL Ventilation layer a Air flow (draft rising air flow)
C7 Notch cf Face plate CP Partition plate dx Horizontal joint ed Lower end side eu Upper end side G Strip (vertical strip)
G 'transverse groove Gc glass fiber nonwoven fabric Gd groove depth hb bolt insertion hole hf horizontal contact interface J13 connection part H7 air hole H7' bolt insertion hole S screw SP plastic nail (nail)
Vf Vertical contact interface W Wooden outer wall (outer wall)
WF Wooden frame (frame)

Claims (8)

It is an outer wall structure of a wooden outer heat insulation in which a breathable heat insulating composite panel is externally attached to the outer wall of a wooden building, and the composite panel (1) is a layered surface (1S) of a heat insulating layer (1B) of a foamed plastic-based heat insulating material In addition, the ventilation groove (G) and the thick part (1C) for layering are arranged in the vertical direction alternately so that both sides become the thick part (1C), The board exterior base material (1A) is integrally layered on the layering surface (1S) of the heat insulating layer (1B), and the lower end of the composite panel (1) is perpendicular to the base (14C) (7W) Is supported by a horizontal piece (7F) provided with an air hole (H7) of a panel bracket (7) having an angle cross section fixed by a thermal bridge prevention structure through a plastic seat plate (8), (G) The composite panel (1) is secured to the wooden frame (WF) as an outer wall while allowing air to flow into the group. A wooden exterior that allows airflow (a) rising in the groove (G) group from the lower end of the panel (1) to be discharged from the upper end of the composite panel (1) through the eaves vent (21) Insulated outer wall structure. The composite panel (1) placed on the panel bracket (7) is provided with a transverse groove (G ') that communicates the lower end of the groove (G) group, and the horizontal piece (7F) of the panel bracket (7). The outer wall structure according to claim 1, wherein the air hole (H7) arranged in the hole communicates with the transverse groove (G '). The structural surface material (13) is stretched on the outer surface of the pillar (14A, 14B) of the wooden frame (WF), and the composite panel (1) is integrally stretched on the outer surface of the structural surface material (13). Item 3. The outer wall structure according to Item 1 or 2 . The upper and lower connections of the composite panel (1) are at the upper end of the lower composite panel (1) at the upper end of the upper composite panel (1) and the large step (d3) protrusion of the heat insulating layer (1B) with respect to the cement board (1A). Of the heat insulation layer (1B) with respect to the cement plate (1A), the heat insulation layer (1B) abuts against each other, the lower cement plate upper edge (eu), and the upper cement plate In the joint interval (d2) with the lower edge (ed), the flat backup material (12B) is abutted and extended on the front surface of the heat insulating layer (1B), and the front surface of the backup material (12B) is filled with the sealing (12). The outer wall structure according to any one of claims 1 to 3 , wherein a horizontal joint (dx) is obtained. The left and right connection of the composite panel (1) is achieved by the abutting contact between the heat insulating layer (1B) protruding from the small step (d1) and the heat insulating layer (1B) entering the small step (d1). The outer wall structure according to any one of claims 1 to 4 , wherein the phases are connected to each other in a phase-missing manner. The composite panel (1) on the lower side of the window (10) has a transverse groove (G ′) communicating with the groove (G) group at the upper end of the heat insulating layer (1B). The upper composite panel (1) has a transverse groove (G ′) communicating with the groove (G) group at the lower end of the heat insulating layer (1B), and the inside of the composite panel (1) below the window rising air stream (a), and flows into the grooves (G) a group of the composite panel (1) of the window upper bypasses the outside of Madokenwaku (10C), according to claim 1 to 5 The outer wall structure according to any one of the above. In the composite panel (1), the thick part (1C) of the heat insulating layer (1B) occupies 50% of the area on the layer attachment surface (1S), and the exterior base material (1A) has a thickness (T2) of 12 ~ 13mm
In, a specific gravity of 0.8 to 1.1, a bending strength of 100~120kgf / cm ^2, the outer wall structure according to any one of claims 1 to 6. In the composite panel (1), the thickness (T3) of the heat insulating layer (1B) is 75 mm, and the depth (Gd) of the groove (G) is 12 to 20 mm.
The outer wall structure according to claim 7 , wherein the groove width (a1) and the thick part width (a2) are the same 45 mm.

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