External insulation structure and manufacturing method

Abstract

To provide an outer thermal insulation structure which can reduce production of waste and realize high adiathermancy, and a manufacturing method.SOLUTION: An outer thermal insulation structure of a building comprises: an outer wall 10: an existing exterior material 30 that is attached to the outer wall 10 with a space on the outside of the outer wall 10; multiple vertical furring strips 26 that are horizontally arrayed between the outer wall 10 and the existing exterior material 30; an upper seal 22 that is interposed between the existing exterior material 30 and the outer wall 10 in the space between the adjacent multiple vertical furring strips 26, blocking the top-end opening of the cavity between the existing exterior material 30 and the outer wall 10; a lower seal 24 that is interposed between the existing exterior material 30 and the outer wall 10 in the space between the adjacent multiple vertical furring strips 26, blocking the bottom-end opening of the cavity between the existing exterior material 30 and the outer wall 10; a sealed layer 28 that is sealed with the existing exterior material 30, the outer wall 10, the vertical furring strips 26, the upper seal 22 and the lower seal 24; and a thermal insulation material 45 that is attached to the existing exterior material 30.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to an external heat insulation structure and a manufacturing method thereof.

Background Art

[0002] Patent Document 1 discloses a reform technology for improving the heat insulation performance of existing wooden houses. Specifically, a part of the existing exterior material installed on the outer wall of the existing wooden house is cut off, and then the cut-off part is closed with a structural facing material. Next, a heat insulating material is attached to the outer surface of the structural facing material. Then, a body edge is installed on the outer surface of the heat insulating material, and finally, a new exterior material is installed on the body edge.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the technology described in Patent Document 1, the cut-off existing exterior material must be discarded as waste. The generation of waste has become a social problem from the perspective of the environment and the like. In addition, in order to sufficiently insulate the house with the newly installed heat insulating material, the heat insulating material needs to have high heat insulation performance, which results in the thickening of the heat insulating material.

[0005] The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an external heat insulation structure and a manufacturing method that can suppress the generation of waste and achieve high heat insulation performance.

Means for Solving the Problems

[0006] The reference numerals shown in the following parentheses are referred to in FIGS. 1 to 6.

[0007] According to the invention of claim 1, an external insulation structure for a building, comprising: an exterior wall (10); an existing exterior material (30) attached to the exterior wall (10) spaced apart from the exterior wall (10) toward the outside; a plurality of vertical furring strips (26) extending vertically between the exterior wall (10) and the existing exterior material (30) and arranged horizontally at intervals; and between adjacent vertical furring strips (26) the existing exterior material (30) and the exterior wall (1 An upper seal (22) is sandwiched between (0) and positioned near the upper end of the existing exterior material (30), closing the opening at the upper end of the cavity between the existing exterior material (30) and the exterior wall (10), and is sandwiched between adjacent vertical furring strips (26) between the existing exterior material (30) and the exterior wall (10), positioned near the lower end of the existing exterior material (30), and the cavity between the existing exterior material (30) and the exterior wall (10) lower end A lower seal (24) that closes the opening, a sealed layer (28) sealed by the existing exterior material (30), the exterior wall (10), the vertical furring strip (26), the upper seal (22) and the lower seal (24), and an insulating material (45) attached to the existing exterior material (30), An exterior material (70) attached to the insulation material (45) in the outdoor area so as to be spaced apart from the insulation material (45), and a ventilation layer (60) formed between the insulation material (45) and the exterior material (70) as the exterior material (70) is spaced apart from the insulation material (45), Equipped with The upper end of the exterior material (70) is in contact with the soffit material (80) above it, and ventilation holes (81) are formed in the soffit material (80) at a position between the upper end of the exterior material (70) and the upper end of the insulation material (45), and the upper end of the ventilation layer (60) is connected to a cavity (82) above the soffit material (80) by the ventilation holes (81). An external insulation structure characterized by the above is provided.

[0008] Claim 4 According to the invention relating to the present invention, a method for manufacturing an external insulation structure of a building, comprising: an upper sealing step of sealing the opening at the upper end of the cavity between adjacent vertical furring strips (26) that are arranged vertically and spaced apart horizontally between an existing exterior material (30) spaced apart from the exterior wall (10) and the exterior wall (10) with an upper seal (22); and a lower sealing step of sealing the opening at the lower end of the cavity between adjacent vertical furring strips (26) with a lower seal (24). A drilling step to form ventilation holes (81) in the soffit material (80) at a position spaced apart from the existing exterior material (30) toward the outside, and , The insulation material (45) is positioned closer to the existing exterior material (30) than to the ventilation holes (81). The insulation material (45) is attached to the existing exterior material (30). Therefore, the insulation material (45) does not block the ventilation holes (81) and keeps them open. The exterior cladding process, An exterior finishing process is performed by attaching the exterior finishing material (70) to the insulation material (45) in such a way that the exterior finishing material (70) is separated from the insulation material (45) outdoors and the upper end of the exterior finishing material (70) touches the soffit material (80) on the outdoor side of the ventilation holes (81), thereby forming a ventilation layer (60) between the insulation material (45) and the exterior finishing material (70), and passing the upper end of the ventilation layer (60) through the ventilation holes (81) into the cavity (82) above the soffit material (80), A manufacturing method is provided that is characterized by including the following.

[0009] Claim 1 or as described above 4According to the invention, since the existing exterior material (30) remains without being removed, the generation of waste is suppressed. Because the sealing layer (28) between the existing exterior material (30) and the exterior wall (10) is sealed by vertical furring strips (26), upper seal (22), and lower seal (24), air is trapped in the sealing layer (28). Therefore, the sealing layer (28) has thermal insulation properties. With such a sealing layer (28) present between the existing exterior material (30) and the exterior wall (10), and because the insulation material (45) is attached to the existing exterior material (30), the thermal insulation performance of the exterior insulation structure is high. Even if the thermal insulation performance of the insulation material (45) is low due to reasons such as the insulation material (45) being thin, the sealing layer (28) compensates for the lack of thermal insulation performance. The sealing layer (28) contributes to the thinness of the insulation material (45) and the high thermal insulation performance of the exterior insulation structure, and in turn contributes to the thinness of the exterior insulation structure. The exterior material (70) protects the insulation material (45) from sunlight, outside air, and wind and rain. The exterior material (70) also contributes to improving the aesthetic design of the building. When the humidity inside the exterior wall (10), sealing layer (28), existing exterior material (30), and insulation material (45) rises, moisture is discharged from inside the exterior wall (10), sealing layer (28), existing exterior material (30), and insulation material (45) into the ventilation layer (60). As a result, condensation inside the exterior wall (10), sealing layer (28), existing exterior material (30), and insulation material (45) is prevented, and deterioration of the exterior wall (10), existing exterior material (30), and insulation material (45) is prevented.

[0010] According to the invention of claim 2, the external insulation structure described in claim 1, The upper end of the insulation material (45) is in contact with the soffit material (80). An external insulation structure characterized by the above is provided.

[0011] Claim 5 According to the invention, 4 The manufacturing method described above, The upper end of the insulation material (45) is brought into contact with the soffit material (80) on the side of the existing exterior material (30) rather than the ventilation hole (81). A manufacturing method characterized by the above is provided.

[0016] Claim 3 According to the invention, 1 or 2 An external insulation structure is provided, characterized in that the insulation material (45) is bonded to the existing exterior material (30).

[0017] Claim 6 According to the invention, 4 or 5 A manufacturing method is provided, characterized in that the thermal insulation material (45) is bonded to the existing exterior material (30) in the exterior cladding step.

[0018] The above Claim 3 or 6 According to the invention related thereto, since the heat insulating material (45) is adhered to the existing exterior material (30), the heat insulating material (45) is firmly attached to the existing exterior material (30).

Effect of the Invention

[0019] According to the present invention, generation of waste can be suppressed. The heat insulation property of the external heat insulation structure is high. Thinning of the heat insulating material and the external heat insulation structure can be achieved.

Brief Description of the Drawings

[0020] [Figure 1] It is a vertical sectional view of the external heat insulation structure of a building. [Figure 2] It is a horizontal sectional view of the side part of the external heat insulation structure of a building. [Figure 3] It is a vertical sectional view of the outer wall of the building before renovation and the existing exterior material. [Figure 4] It is an explanatory view of the rainproof process. [Figure 5] It is an explanatory view of the drilling process, the upper sealing process, the lower sealing process, and the exterior covering process. [Figure 6] It is an explanatory view of the exterior finishing process.

Mode for Carrying Out the Invention

[0021] Hereinafter, embodiments will be described with reference to the drawings. The features and technical effects of the embodiments will be understood from the following detailed description and drawings. However, the scope of the present invention is not limited to the embodiments disclosed below. Since the drawings are provided for illustrative purposes only, the scope of the present invention is not limited to the illustrations in the drawings.

[0022] <1. External Heat Insulation Structure> Figure 1 is a vertical cross-sectional view showing the external insulation structure of the building. The building is a wooden house with a wall structure. A wall structure refers to a structure in which the building is supported by planar structures such as walls and floors. More specifically, the building is a wooden house constructed using the wood panel construction method. Alternatively, the building may be a wooden house with a wall structure constructed using the wood frame wall construction method. Alternatively, the building may be a wooden house with a rigid frame structure constructed using the wood frame construction method. This building is a two-story house. However, the building may also be a one-story or three-story house. This building has been renovated, and its thermal insulation performance has been improved as a result of the renovation. In other words, the building's external insulation structure was added during the renovation.

[0023] The exterior insulation structure includes an existing exterior wall 10, an existing waterproof and breathable sheet 20, an upper seal 22, a lower seal 24, vertical furring strips 26, a sealing layer 28, existing exterior cladding 30, insulation material 45, a waterproof and breathable sheet 50, vertical furring strips 55, a ventilation layer 60, exterior cladding 70, and flashing 75. The existing exterior wall 10, existing waterproof and breathable sheet 20, vertical furring strips 26, and existing exterior cladding 30 were installed before the renovation, while the seals 22, 24, insulation material 45, waterproof and breathable sheet 50, vertical furring strips 55, ventilation layer 60, exterior cladding 70, and flashing 75 were newly installed during the renovation. With the installation of seals 22 and 24, the existing ventilation layer 90 described later becomes the sealing layer 28.

[0024] The existing exterior wall 10 is installed on the foundation 12. A horizontal intervening material 15 is laid on the upper end of the foundation 12 and may also be sandwiched between the existing exterior wall 10 and the foundation 12. The intervening material 15 is, for example, a ventilation base ring. The ventilation base ring has numerous ventilation holes that lead from the underfloor space of the first floor to the outside.

[0025] The existing exterior wall 10 has a plurality of wall panels 11 that are erected and joined along a vertical plane. The wall panels 11 are hollow wooden panels. Specifically, the wall panel 11 has a rectangular frame 11a having a pair of vertical frames and a pair of horizontal frames, two facing materials 11b, 11c that are attached to the front and back surfaces of the rectangular frame 11a, respectively, to cover the inside of the rectangular frame, and one or more auxiliary battens assembled vertically, horizontally, or vertically and horizontally inside the rectangular frame. Insulation material may be filled between the two facing materials. The wall panels 11 on the first floor are arranged horizontally on a horizontal sill plate 13 on the foundation 12, and adjacent wall panels 11 in the horizontal direction are joined to each other. Horizontal girders 14 extending horizontally are joined to the upper ends of the wall panels 11 on the first floor. The wall panels 11 on the second floor are arranged horizontally on the girders 14, and adjacent wall panels 11 in the horizontal direction are joined to each other. Furthermore, if the building is a wooden house with a rigid frame structure constructed using a wooden frame construction method, the existing exterior wall 10 has multiple studs, sheathing attached to those studs from the outside, and sheathing attached to those studs from the inside.

[0026] The existing waterproof and breathable sheet 20 is attached to the outer surface of the existing exterior wall 10. The outer surface of the existing exterior wall 10 refers to the side facing the outdoors, and the inner surface of the existing exterior wall 10 refers to the side facing the indoors. In Figure 1, the existing waterproof and breathable sheet 20 is shown separated from the outer surface of the existing exterior wall 10, but in reality, the existing waterproof and breathable sheet 20 is in contact with the outer surface of the existing exterior wall 10.

[0027] The existing exterior cladding 30 is attached to the existing exterior wall 10, away from the existing waterproof and breathable sheet 20 and the existing exterior wall 10, towards the outside. Specifically, multiple vertical furring strips 26 are fixed to the outer surface of the existing exterior wall 10 from the outside side of the existing waterproof and breathable sheet 20, and these vertical furring strips 26 are sandwiched between the existing cladding 30 and the existing exterior wall 10, with the existing cladding 30 fixed to these vertical furring strips 26. The vertical furring strips 26 extend in the vertical direction and are fixed to the outer surface of the existing exterior wall 10 by screws or adhesive. These vertical furring strips 26 are arranged along the existing exterior wall 10 at intervals. The vertical furring strips 26 function as spacers that form a gap between the existing cladding 30 and the existing exterior wall 10.

[0028] The upper seal 22 is sandwiched between the existing exterior material 30 and the existing exterior wall 10 between adjacent vertical furring strips 26. The upper seal 22 is positioned towards the upper end of the existing exterior material 30. The upper seal 22 closes the opening at the upper end of the cavity between the existing exterior material 30 and the existing exterior wall 10.

[0029] The lower seal 24 is sandwiched between the existing exterior cladding 30 and the existing exterior wall 10 between adjacent vertical furring strips 26. The lower seal 24 is positioned towards the lower end of the existing exterior cladding 30. The lower seal 24 closes the opening at the lower end of the cavity between the existing exterior cladding 30 and the existing exterior wall 10. The seals 22 and 24 are made of resin, foam material, synthetic rubber, or silicone rubber.

[0030] The sealed layer 28 is a cavity sealed by seals 22, 24, vertical furring strips 26, existing exterior material 30, and existing exterior wall 10. Specifically, the existing exterior material 30 covers the sealed layer 28 from the outside, the existing exterior wall 10 covers the sealed layer 28 from the inside, the vertical furring strips 26 seal the sides of the sealed layer 28 from the side, the upper seal 22 seals the upper end of the sealed layer 28 from above, and the lower seal 24 seals the lower end of the sealed layer 28 from below. Since the air inside the sealed layer 28 is trapped by seals 22, 24, vertical furring strips 26, existing exterior material 30, and existing exterior wall 10, the sealed layer 28 has thermal insulation properties. Adjacent sealed layers 28 are separated by vertical furring strips 26 between them. A desiccant may also be contained in the sealed layer 28.

[0031] The insulation material 45 is attached to the outer surface of the existing exterior material 30. The method of attaching the insulation material 45 to the existing exterior material 30 can be any method, and the insulation material 45 is supported, attached, fixed, or bonded to the existing exterior material 30. The insulation material 45 may be directly fixed to the existing exterior material 30 by fasteners such as screws or metal fittings, or it may be indirectly fixed to the existing exterior material 30 by being directly fixed to the existing exterior wall 10 by fasteners such as screws or metal fittings. For example, screws may be driven into the insulation material 45 and the existing exterior material 30 from the outside. The screws may or may not reach the existing exterior wall 10. The screws contribute to the firm fixation of the insulation material 45. For example, an adhesive such as a special putty bond may be applied to the outer surface of the existing exterior material 30, and the insulation material 45 may be bonded to the existing exterior material 30 by the adhesive. If the outer surface of the existing exterior material 30 is uneven, the adhesive will fill the recesses in the outer surface of the existing exterior material 30, thus contributing to the suppression of gaps between the insulation material 45 and the existing exterior material 30.

[0032] The insulation material 45 consists of, for example, phenolic foam, polystyrene foam, glass wool, rock wool, urethane foam, polyolefin foam, or cellulose fiber.

[0033] The insulation material 45 may consist of multiple standardized rectangular or square insulation modules installed along the outer surface of the existing exterior material 30. The side length of the insulation module is an integer multiple of a standard length, such as 910 mm or 1000 mm. The insulation module may have a rectangular frame, a facing material attached to one or both sides of the rectangular frame, and an insulating material (e.g., phenolic foam, polystyrene foam, glass wool, rock wool, urethane foam, polyolefin foam, or cellulose fiber) filled inside the rectangular frame. When multiple insulation modules are used in the insulation material 45, and the end of the insulation material 45 is located at an outside corner of the building, an insulating fitting may be attached to that end.

[0034] The waterproof and breathable sheet 50 is attached to the outer surface of the insulation material 45. The outer surface of the insulation material 45 refers to the side facing the outdoors, and the inner surface of the insulation material 45 refers to the side facing the indoors. In Figure 1, the waterproof and breathable sheet 50 is shown separated from the outer surface of the insulation material 45, but in reality, the waterproof and breathable sheet 50 is in contact with the outer surface of the insulation material 45.

[0035] The exterior cladding 70 is attached to the insulation material 45, away from the waterproof and breathable sheet 50 and the insulation material 45, towards the outside. Specifically, multiple vertical furring strips 55 are attached to the insulation material 45 from the outside side of the waterproof and breathable sheet 50, and these vertical furring strips 55 are sandwiched between the exterior cladding 70 and the insulation material 45, fixing the exterior cladding 70 to these vertical furring strips 55. These vertical furring strips 55 extend in the vertical direction and are arranged horizontally at intervals. These vertical furring strips 55 function as spacers that form a gap between the exterior cladding 70 and the insulation material 45. A cavity is formed between the exterior cladding 70 and the insulation material 45, and this cavity is a ventilation layer 60. The lower end of the ventilation layer 60 is open and leads to the outside, and the upper end of the ventilation layer 60 leads to the cavity 82 above the soffit material 80 and the ceiling space of the second floor through ventilation holes 81 in the soffit material 80. Furthermore, the upper end of the exterior material 70 may be separated downward from the soffit material 80, and the upper end of the ventilation layer 60 may be open to the outside. In this case, the ventilation holes 81 are not formed.

[0036] The flashing 75 is installed beneath the insulation 45, the ventilation layer 60, and the exterior cladding 70. The flashing 75 is fixed, for example, to the lower end of the existing exterior cladding 30. The flashing 75 slopes downward outward and is separated from the exterior cladding 70. The lower end of the ventilation layer 60 is not blocked by the flashing 75 and is open.

[0037] As shown in Figure 2, when the exterior material 70 and insulation material 45 are adjacent to the sash 85, the edges of the exterior material 70 and insulation material 45 closer to the sash 85 are covered by the trim material 77. The trim material 77 is positioned on the outdoor side of the existing trim material 87 embedded between the sash frame 86 of the sash 85 and the existing exterior material 30, and extends vertically along the existing trim material 87. The trim material 77 is fixed to the existing exterior material 30, for example. Since the trim material 77 and the existing trim material 87 are provided in a box shape with a hollow interior, the trim material 77 and the existing trim material 87 are also called a casing.

[0038] <2. Manufacturing method for external insulation structure> This section explains the manufacturing method for external insulation structures, that is, the method for renovating the exterior walls of buildings.

[0039] As shown in Figure 3, before the renovation, the existing waterproof and breathable sheet 20 was attached to the outer surface of the existing exterior wall 10, the existing exterior material 30 was attached to the existing exterior wall 10, away from the existing waterproof and breathable sheet 20 and the existing exterior wall 10 toward the outside, and the existing ventilation layer 90 as a cavity was formed between the existing exterior material 30 and the existing exterior wall 10. The lower end of the existing ventilation layer 90 is open and leads to the outside. The upper end of the existing ventilation layer 90 leads to the cavity 82 above the soffit material 80 and to the ceiling space of the second floor.

[0040] (1) Washing process First, the existing exterior material 30 is cleaned. Additionally, the existing flashing 75 located below the existing exterior material 30 will be removed.

[0041] (2) Rainproofing process Next, as shown in Figure 4, multiple support columns 100 are erected on the ground at a location away from the existing exterior material 30, and these support columns 100 are arranged horizontally along the existing exterior material 30. Scaffolding support columns may be used for the support columns 100. A temporary roof 101 is placed between the upper ends of these support columns 100 and the building's roof 110, and the temporary roof 101 is fixed to the support columns 100. Scaffolding planks may be used for the temporary roof 101. A recess 102 is formed on the underside of the temporary roof 101 for the upper ends of the support columns 100 to catch on. A buffer material 103 is provided on the edge of the underside of the temporary roof 101 to protect the building's roof 110. The buffer material 103 is made of rubber, for example. By installing such a temporary roof 101, the renovation work can proceed even if it rains during the renovation period, and materials and the existing exterior material 30 will not get wet in the rain.

[0042] (3) Drilling process Next, as shown in Figure 5, ventilation holes 81 are made in the soffit material 80 at a position away from the existing exterior material 30 by the thickness of the insulation material 45. Note that it is not necessary to form ventilation holes 81.

[0043] (4) Upper sealing process and lower sealing process Next, as shown in Figure 5, uncured resin, synthetic rubber, silicone rubber, or foam material is injected into the opening at the upper end of the existing ventilation layer 90 to seal the opening at the upper end of the existing ventilation layer 90 with the resin, synthetic rubber, silicone rubber, or foam material. At this time, the uncured resin, synthetic rubber, silicone rubber, or foam material may be injected into the opening at the upper end of the existing ventilation layer 90 from the cavity 82 above the soffit material 82. Alternatively, the upper end of the existing exterior material 30 may be cut off, and the uncured resin, synthetic rubber, silicone rubber, or foam material may be injected from the outside through the cut-off section into the opening at the upper end of the existing ventilation layer 90. The upper seal 22 is formed by the curing of the resin, synthetic rubber, silicone rubber, or foam material.

[0044] Uncured resin, synthetic rubber, silicone rubber, or foam material is injected into the opening at the lower end of the existing ventilation layer 90 to seal the opening at the lower end of the existing ventilation layer 90 with the resin, synthetic rubber, silicone rubber, or foam material. The lower seal 24 is formed by the curing of the resin, synthetic rubber, silicone rubber, or foam material.

[0045] As described above, by installing the upper seal 22 and the lower seal 24, the existing ventilation layer 90 is sealed, and the existing ventilation layer 90 becomes a sealed layer 28.

[0046] Alternatively, a desiccant may be placed in the existing ventilation layer 90 before installing the upper seal 22 or the lower seal 25, or both thereof.

[0047] Alternatively, a dry method may be used instead of a wet method. That is, a dry joint as an upper seal 22 may be fitted into the opening at the upper end of the existing ventilation layer 90, or a dry joint as a lower seal 22 may be fitted into the opening at the upper end of the existing ventilation layer 90. A dry joint refers to a pre-cured resin, synthetic rubber, silicone rubber, or foam material. In this case, the dry joint may be bonded to the existing exterior material 30 and the existing exterior wall 10 with an adhesive.

[0048] (5) Exterior cladding process Next, as shown in Figure 5, the insulation material 45 is attached to the outer surface of the existing exterior material 30. For example, adhesive may be applied to the existing exterior material 30, the insulation material 45, or both, and the insulation material 45 may be bonded to the existing exterior material 30 with the adhesive. The insulation material 45 may be directly fixed to the existing exterior material 30 with fasteners such as screws or metal fittings, or the insulation material 45 may be indirectly fixed to the existing exterior material 30 by directly fixing the insulation material 45 to the existing exterior wall 10 with fasteners such as screws or metal fittings. Screws may also be driven into the insulation material 45 and the existing exterior material 30 from the outside.

[0049] Next, attach the waterproof and breathable sheet 50 to the insulation material 45.

[0050] (6) Exterior process Next, as shown in Figure 6, the vertical furring strips 55 are attached to the insulation material 45 from the outside of the waterproof and breathable sheet 50. Next, the exterior material 70 is fixed to the vertical furring strips 55 so as to be separated from the waterproof and breathable sheet 50 and the insulation material 45, thereby forming a ventilation layer 60 between the exterior material 70 and the insulation material 45. If ventilation holes 81 are formed, the opening at the upper end of the ventilation layer 60 is passed through the ventilation holes 81 when installing the exterior material 70. If ventilation holes 81 are not formed, the upper end of the exterior material 70 is separated from the soffit material 80 when installing the exterior material 70.

[0051] (7) Finishing process Next, the flashing 75 is positioned away from the insulation material 45 and the ventilation layer 60, and fixed to, for example, the lower end of the existing exterior material 30. Next, the edges of the exterior material 70 and insulation material 45 near the sash 85 are covered with the trim material 77, and the existing trim material 87 embedded between the sash frame 86 of the sash 85 and the existing exterior material 30 is also covered with the trim material 77. The trim material 77 may be fixed to the insulation material 45, the exterior material 70, or the existing trim material 87. Next, the temporary roof 101 and support columns 100 are removed.

[0052] <3. Summary> Since the existing exterior materials 30 and existing waterproof and breathable sheets 20 remain in place, waste generation is minimized. Furthermore, because there is no need to remove the existing exterior materials 30 and existing waterproof and breathable sheets 20, construction time, labor, and costs are reduced.

[0053] Because a heat-insulating airtight layer 28 is provided between the existing exterior material 30 and the existing exterior wall 10, and the insulation material 45 is attached to the existing exterior material 30, the insulation performance of the exterior insulation structure is high. Even if the insulation material 45 is thin and has low insulation performance, the airtight layer 28 compensates for the lack of insulation performance. Therefore, the airtight layer 28 contributes to the thinness of the insulation material 45 and the high insulation performance of the exterior insulation structure, and in turn contributes to the thinness of the exterior insulation structure.

[0054] Because the insulation material 45 is bonded to the existing exterior material 30 with adhesive, the insulation material 45 is firmly attached to the existing exterior material 30. In particular, even if the outer surface of the existing exterior material 30 is uneven, the adhesive fills in the recesses on the outer surface of the existing exterior material 30, making it unlikely for gaps to form between the insulation material 45 and the existing exterior material 30.

[0055] Since the existing waterproof and breathable sheets 20 and 50 are breathable, when the humidity inside the existing exterior wall 10, sealing layer 28, existing exterior material 30, and insulation material 45 rises, moisture is discharged from the existing exterior wall 10, sealing layer 28, existing exterior material 30, and insulation material 45 into the ventilation layer 60. Since the ventilation layer 60 is connected to the cavity 82 above the soffit material 80 and to the outside, moisture is discharged from the ventilation layer 60. As a result, condensation inside the existing exterior wall 10, sealing layer 28, existing exterior material 30, and insulation material 45 is prevented, and deterioration of the existing exterior wall 10, existing exterior material 30, and insulation material 45 is prevented.

[0056] The external insulation structure and its manufacturing method described above contribute to reducing energy consumption in homes and suppressing waste generation. In other words, the external insulation structure contributes to promoting carbon neutrality, realizing a decarbonized society, and achieving the Sustainable Development Goals (SDGs). [Explanation of symbols]

[0057] 10 Existing exterior wall 22 Upper seal 24 Lower Seal 26 Vertical framing 28 Sealing layer 30 Existing exterior materials 45 Insulation 60 Ventilation layer 70 Exterior materials 90 Existing ventilation layer (cavity)

Claims

1. The building has an external insulation structure, The exterior walls and The existing exterior material attached to the exterior wall is spaced apart from the exterior wall toward the outside, A plurality of vertical furring strips extending vertically between the exterior wall and the existing exterior material, and arranged horizontally at intervals, An upper seal is sandwiched between adjacent vertical furring strips, between the existing exterior material and the exterior wall, positioned near the upper end of the existing exterior material, and closing the opening at the upper end of the cavity between the existing exterior material and the exterior wall. A lower seal is sandwiched between adjacent vertical furring strips, between the existing exterior material and the exterior wall, positioned near the lower end of the existing exterior material, and closing the opening at the lower end of the cavity between the existing exterior material and the exterior wall. A sealed layer enclosed by the existing exterior material, the exterior wall, the vertical furring strips, the upper seal and the lower seal, The insulation material attached to the aforementioned existing exterior material, An exterior material attached to the insulation material so as to be spaced apart from the insulation material in the outdoor area, The exterior material is separated from the insulation material, thereby forming a ventilation layer between the insulation material and the exterior material, Equipped with, The upper end of the exterior material is in contact with the soffit material above it. Ventilation holes are formed in the soffit material at a position between the upper end of the exterior material and the upper end of the insulation material. An external insulation structure characterized in that the upper end of the ventilation layer is connected to a cavity above the soffit material through the ventilation holes.

2. The external insulation structure according to claim 1, The upper end of the aforementioned insulation material is in contact with the soffit material. An external insulation structure characterized by the following features.

3. An external insulation structure according to claim 1 or 2, The aforementioned insulation material is bonded to the existing exterior material. An external insulation structure characterized by the following features.

4. A method for manufacturing an external insulation structure for a building, An upper sealing step in which the openings at the upper ends of the cavities between adjacent vertical furring strips, which are arranged vertically and spaced apart horizontally between the existing exterior material spaced apart from the exterior wall and the exterior wall, are sealed with an upper seal, A lower sealing step is performed to seal the opening at the lower end of the cavity between adjacent vertical furring strips using a lower seal. A drilling step to form ventilation holes in the soffit material at a position spaced apart from the existing exterior material toward the outside, An exterior cladding step in which the insulation material is attached to the existing exterior cladding material so that the insulation material is positioned on the existing exterior cladding material rather than on the ventilation holes, thereby keeping the ventilation holes open without blocking them with the insulation material, An exterior finishing process is performed by attaching the exterior finishing material to the insulation material outdoors such that the exterior finishing material is separated from the insulation material and the upper end of the exterior finishing material is in contact with the soffit material on the outdoor side of the ventilation holes, thereby forming a ventilation layer between the insulation material and the exterior finishing material, and passing the upper end of the ventilation layer through the ventilation holes into the cavity above the soffit material. A manufacturing method characterized by including the following.

5. The manufacturing method according to Claim 4, In the exterior cladding process, the upper end of the insulation material is brought into contact with the soffit material on the existing exterior material side rather than on the ventilation holes. A manufacturing method characterized by the following features.

6. A manufacturing method according to claim 4 or 5, In the exterior cladding process, the insulation material is bonded to the existing exterior material. A manufacturing method characterized by the following features.

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