Sauna house and its manufacturing method

Abstract

To provide a sauna house which has high heat insulation and moisture retention, is lightweight while maintaining strength, has a freely selectable shape, has a high degree of freedom in installation and movement, suppresses VOC generation, and can be used at high temperatures, and a manufacturing method thereof. [Solution] A sauna house 1 of a type to be installed outdoors, which has, inside the wall between an interior material 45 and an exterior material 44 in a side wall portion 4, a metal core material 41 formed from a metal plate, an inner insulating resin material 42 attached to the inside of the metal core material 41, and an outer insulating resin material 43 which is an insulating material different from the inner insulating resin material 42 and is attached to the outside of the metal core material 41, and the inner insulating resin material 42 is formed from a high heat resistant insulating material that has heat resistance to high temperatures of 80°C or more.

Description

[Technical field]

[0001] The present invention relates to a sauna house to be installed outdoors and a method for manufacturing the same. [Background technology]

[0002] Saunas improve blood circulation through sweating, allowing oxygen and nutrients to circulate throughout the body. They also have a variety of other health benefits, such as regulating the autonomic nervous system, relieving stress and pain through hormone secretion, lowering blood pressure, and reducing stress, which is why they are used by many people.

[0003] Traditionally, saunas were mainly installed in bathing facilities such as public baths and hot springs. However, with the recent popularity of saunas, more and more people are installing their own saunas at home or in vacation homes, and so far a number of inventions and products relating to these private saunas have been developed.

[0004] For example, Utility Model Registration No. 3246034 proposes an invention relating to a concrete sauna that can be installed outdoors, such as in a home garden or a villa, and is used as a high-temperature dry sauna (Patent Document 1).

[0005] In addition, a sauna house made of polystyrene foam that can be loaded onto a tow vehicle and moved has been developed and is on sale (Non-Patent Document 1). [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Utility Model Registration No. 3246034 [Non-patent literature]

[0007] [Non-Patent Document 1] Freely Base Co., Ltd., Corporate website, Company profile, [online], [Search date 2024.10.2], Internet<URL:https: / / freelybase.jp / company / > Summary of the Invention [Problem to be solved by the invention]

[0008] However, the concrete sauna described in Patent Document 1 has a heavy weight because the housing is made of concrete, and it can be difficult to install or move. In addition, concrete has a high thermal conductivity and its insulation performance is several to several dozen times lower than that of wood, etc., so if a concrete sauna is installed outdoors, the heat inside the sauna will rapidly escape to the outdoors, and there is a problem that the temperature inside the sauna does not reach a high level.

[0009] Moreover, the sauna house described in Non-Patent Document 1 is generally made of polystyrene foam, which is the material of the casing, and has a heat resistance temperature of about 70°C to 80°C. However, dry saunas are used at high indoor temperatures of about 80°C to 110°C, and using them in this temperature range can cause problems such as deformation due to thermal decomposition and the generation of VOCs (volatile organic compounds). Furthermore, polystyrene foam is weak in strength, and if installed in an area with snowfall, it may be crushed by the weight of the accumulated snow.

[0010] The present invention has been made to solve the above-mentioned problems, and aims to provide a sauna house and a manufacturing method thereof that has high insulation and moisture retention properties, is lightweight while maintaining its strength, has a freely selectable shape, has a high degree of freedom in installation and movement, suppresses VOC emissions, and can be used at high temperatures. [Means for solving the problem]

[0011] The sauna house of the present invention is a type that is lightweight, has a freely selectable shape, and can be used in high temperature ranges (for example, 80°C or higher and 110°C or lower) used in dry saunas, and is installed outdoors in order to solve the problem of suppressing the generation of VOCs.The sauna house of the present invention has, inside the wall between the interior and exterior materials in the side wall portion, a metal core material formed from a metal plate, an inner insulating resin material attached to the inside of the metal core material, and an outer insulating resin material that is an insulating material different from the inner insulating resin material and is attached to the outside of the metal core material, and the inner insulating resin material is formed from a high heat-resistant insulating material that has heat resistance to high temperatures of 80°C or higher.

[0012] In addition, as one aspect of the present invention, in order to solve the problems of enabling use in high temperature zones while providing high moisture retention and increasing the load-bearing performance of the roof at low cost, the inner insulating resin material may be formed from phenol foam and the outer insulating resin material may be formed from bead method polystyrene foam.

[0013] Furthermore, as one aspect of the present invention, in order to solve the problem of protecting the side wall portion near the heat source device, the insulating resin material that is affixed to the outside of the metal core material on the side wall portion at the rear position of the heat source device installed in the sauna house may be made of the same high heat resistant insulating material as the inner insulating resin material, rather than the outer insulating resin material.

[0014] In addition, as one aspect of the present invention, in order to solve the problem of forming a curved side wall portion, the outer insulating resin material of the side wall portion that is to be curved may have a plurality of curving grooves formed in the left-right direction on its inner surface from the upper end to the lower end, the grooves having a depth of more than half the thickness of the outer insulating resin material, and the adhesive filled in the curving grooves may be applied along the outside of the curved metal core material.

[0015] The manufacturing method for a sauna house of the present invention is a method for manufacturing a sauna house in order to solve the problem of easily creating a side wall portion that is lightweight, has a freely selectable shape, can be used in high temperature ranges (for example, 80°C or higher and 110°C or lower) used in dry saunas, and can suppress the generation of VOCs, and includes a temporary frame forming step of forming a temporary frame along the outer peripheral edge of the floor from the floor to the ceiling, a metal core installing step of installing a metal core material made of a metal plate on the outside of the temporary frame, an outer resin material applying step of applying an outer insulating resin material to the outside of the metal core material and screwing the outer insulating resin material together with the metal core material to the floor, the ceiling and any intermediate parts thereof with a plurality of screws, a temporary frame removing step of removing the temporary frame from the metal core material, and an inner resin material applying step of applying an inner insulating resin material to the inside of the metal core material.

[0016] In addition, as one aspect of the present invention, in order to solve the problem of improving the insulation performance of the sauna house by suppressing heat dissipation through the screws in the side wall portions, the present invention may include a screw removal step in which, of the multiple screws fastening the outer insulating resin material, the screws in the middle portions are removed while leaving the screws in the floor and ceiling portions.

[0017] Furthermore, as one aspect of the present invention, in order to solve the problem of forming a curved side wall portion, when the outer insulating resin material is applied to the curved metal core in the outer resin material application step, a plurality of curving grooves having a depth of more than half the thickness of the outer insulating resin material from the upper end to the lower end may be formed in the left-right direction on the inner surface of the outer insulating resin material, and adhesive may be filled into the curving grooves and applied while curving along the outer surface of the metal core. Effect of the Invention

[0018] According to the present invention, it is possible to obtain a material that has high heat insulation and moisture retention properties, is lightweight while maintaining strength, has a freely selectable shape, has a high degree of freedom in installation and movement, suppresses VOC emissions, and can be used at high temperatures. [Brief description of the drawings]

[0019] [Figure 1] A front view showing one embodiment of the sauna house of the present invention. [Diagram 2] A side view showing the sauna house of this embodiment. [Diagram 3] A cross-sectional view showing the sauna house of this embodiment. [Figure 4] 4 is an enlarged cross-sectional view showing the internal structure of a side wall portion in the present embodiment. FIG. [Diagram 5] A vertical cross-sectional view showing the sauna house of this embodiment. [Figure 6] 1 is a perspective view showing an outer insulating resin material corresponding to a curved metal core material in this embodiment. FIG. [Figure 7] FIG. 1 is a side view and a plan view showing a temporary frame forming step according to one embodiment of the method for manufacturing a sauna house of the present invention. [Figure 8] FIG. 4 is a plan view showing a metal core setting step in this embodiment. [Figure 9] 10 is a plan view showing an outer resin material applying step in this embodiment. FIG. [Figure 10] FIG. 11 is a plan view showing a screw removing step in the present embodiment. [Figure 11] FIG. 11 is a plan view showing a temporary frame removing step in the present embodiment. [Figure 12] 10 is a plan view showing an inner resin material applying step in this embodiment. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] Hereinafter, an embodiment of a sauna house and a manufacturing method thereof according to the present invention will be described with reference to the drawings.

[0021] The sauna house 1 of this embodiment is a sauna building of the type to be installed outdoors, and as shown in Figures 1, 2 and 3, has a foundation 2 that serves as the base when installed outdoors, a floor 3 installed on the foundation 2, side wall parts 4 installed around the floor 3, a ceiling part 5 placed on the side wall parts 4, and a heat source device 6 installed indoors.

[0022] The foundation 2 is a structure for fixing the sauna house 1 to the ground or the like, and in this embodiment is formed from wood into an oval shape when viewed from above, with the outer peripheral surface coated with weather-resistant paint.

[0023] The construction of the foundation 2 is not limited to wood, and for example, when the sauna house 1 is placed on a towing vehicle, it may be made of L-shaped metal fittings, H-shaped steel beams, square pipes, etc. to be fixed to the towing vehicle.

[0024] The floor section 3 is a section that is installed on the foundation section 2 to become the floor of the indoor space, and in this embodiment, as shown in Fig. 3, is formed in an oval shape that is slightly larger than the foundation section 2. This floor section 3 is made of wood, and has a heat insulating material built in or buried therein. The bottom surface of the floor section 3 is painted with the same paint as the foundation section 2 as an exterior material. Furthermore, a metal plate is attached to the upper surface of the floor section 3 to improve waterproofing, and a flame-retardant floor material 31 is laid on the upper surface as an interior material in the area where the electric stove 61 of the heat source device 6 is to be installed, and flooring material 32 is laid in the other areas.

[0025] The insulation material built into or embedded in the floor portion 3 is not particularly limited, but it is preferable that the portion that comes into contact with the indoors via the interior material be made of the same high heat-resistant insulation material as the interior insulation resin material 42 used in the side wall portion 4.

[0026] The side wall 4 is a part that serves as a side wall separating the inside and outside of the room, and is a wall structure that has high thermal insulation and moisture retention, is lightweight while maintaining strength, has high thermal insulation performance, and is also designed with measures against VOCs (volatile organic compounds). As shown in Figures 1 and 2, the side wall 4 in this embodiment is provided with an entrance door 7 that serves as an entrance to the inside of the room, and a window 8 for letting in light.

[0027] In addition, as shown in Figure 4, the side wall portion 4 in this embodiment has, as a structure between the exterior material 44 and the interior material 45, a metal core material 41 made of a metal plate, an inner insulating resin material 42 attached to the inside of this metal core material 41, and an outer insulating resin material 43 attached to the outside of the metal core material 41.

[0028] The metal core 41 is intended to increase the tensile strength while reducing the weight of the side wall 4, and in this embodiment is made of a steel plate with a thickness of about 1 mm. This metal core 41 is installed in a portion other than the openings in the entrance door 7 and window 8, and in this embodiment, as shown in Fig. 5, is fastened to the side surface of the floor portion 3 and the side surface of the ceiling portion 5 with screws 46.

[0029] The metal core 41 is not limited to a steel plate, but may be appropriately selected from an aluminum plate, a stainless steel plate, a copper plate, etc. The thickness of the metal core 41 is not limited to about 1 mm, but may be appropriately selected taking into account the balance between weight and strength.

[0030] The inner insulating resin material 42 is intended to improve the insulating performance of the side wall portion 4, and is an insulating material that can suppress deformation due to thermal decomposition and the like in a high-temperature environment and the generation of VOCs while achieving weight reduction. The inner insulating resin material 42 in this embodiment is formed of a highly heat-resistant insulating material that has heat resistance to high temperatures of 80°C or higher, and specifically, is formed of phenol foam with a thickness of about 35 mm.

[0031] Phenolic foam is an insulating material made by mixing phenolic resin with a foaming agent and a hardener and forming it into a plate shape. It is lightweight, has high insulating and heat resistance, and has low water absorption and moisture permeability, so it can maintain high indoor humidity. Specifically, the weight of the phenolic foam used is about 17 kg / m. 3 It has a heat insulation performance of approximately 0.020 W (m K), making it lightweight and highly heat insulating. It also has heat resistance of 120°C or higher, specifically, it can withstand continuous exposure to heat of 130°C. Therefore, while the indoor temperature of a typical dry sauna or Finnish sauna loyly (sauna using hot stones as a heat source) is approximately 80°C to 110°C, phenol foam does not decompose thermally and can suppress the generation of VOCs even when used in such temperature ranges.

[0032] As shown in Fig. 5, the inner insulating resin material 42 in this embodiment has a height extending from the upper surface of the floor 3 to the lower surface of the ceiling 5, and is attached to the inside of the metal core material 41, between the floor 3 and the ceiling 5. As shown in Fig. 12, butyl rubber 47 is used as the adhesive for attachment. Butyl is a synthetic rubber produced by cationic copolymerization of isobutylene and a small amount of isoprene, has high heat resistance, and can suppress the generation of VOCs.

[0033] The inner insulating resin material 42 is not limited to phenol foam, but can be appropriately selected from high heat resistant insulating materials having heat resistance to high temperatures of 80°C or higher, such as insulating materials made of glass fiber. The thickness of the inner insulating resin material 42 is not limited to approximately 35 mm, but can be appropriately selected taking into consideration the necessary insulating performance based on the size of the sauna house 1, the indoor / outdoor temperature zones, the heat generation amount of the heat source device 6, etc. Furthermore, the inner insulating resin material 42 may be screwed to the metal core material 41 as necessary.

[0034] The outer insulating resin material 43 is an insulating material that is attached to the outside of the metal core material 41 to improve the insulating performance of the side wall portion 4 as well as to increase the compressive strength of the side wall portion 4, and in this embodiment is formed from bead-method polystyrene foam approximately 35 mm thick.

[0035] Bead method polystyrene foam has little change in its insulating performance over time, is resistant to bending and cracking, has high compressive strength, and has low water absorption and moisture permeability, making it possible to maintain high indoor humidity, and is a relatively inexpensive insulating material.

[0036] On the other hand, bead-method polystyrene foam has a heat resistance of about 77°C, and use at temperatures of 80°C or higher, such as in a dry sauna, may cause deformation and VOC generation due to thermal decomposition, etc. Therefore, in this embodiment, the outer insulating resin material 43 is attached to the outside via the inner insulating resin material 42 and the metal core material 41 so that the temperature does not exceed the heat resistance.

[0037] As shown in Figure 5, the outer insulating resin material 43 is formed to a height approximately equal to the height from the side of the floor portion 3 to the side of the ceiling portion 5, which is approximately the same as the height of the metal core material 41, and is attached to the outside of the metal core material 41 with an adhesive and several screws 46.

[0038] The outer insulating resin material 43, which is applied along the outside of the curved metal core material 41, has a plurality of curve grooves 431 formed on its inner surface from the upper end to the lower end, as shown in Fig. 6. Each curve groove 431 is formed to a depth of at least half the thickness of the outer insulating resin material 43, making it easy to curve along the metal core material 41. In this embodiment, the curve grooves 431 are filled with adhesive, and the outer insulating resin material 43 is applied while being curved along the metal core material 41.

[0039] Furthermore, the screws 46 that secure the outer insulating resin material 43 are mainly screwed to the side surfaces of the floor portion 3 and the ceiling portion 5 so as to penetrate the metal core material 41, as shown in FIG.

[0040] 3, the insulating resin material 43a attached to the outside of the metal core 41 at the rear side of the heat source device 6 is made of the same high heat resistant insulating material as the inner insulating resin material 42, rather than the outer insulating resin material, because there is a risk of it becoming unintentionally hot due to the heat from the heat source device 6. In this embodiment, an insulating material made of phenol foam is attached to the rear side of the heat source device 6 over an area that is about twice as wide as the width of the heat source device 6.

[0041] The outer insulating resin material 43 is not limited to a thermal insulating material made of bead-method polystyrene foam, but may be appropriately selected from other thermal insulating materials such as extruded polystyrene foam and hard urethane foam.

[0042] The exterior material 44 and the interior material 45 are materials for decorating the side wall portion 4, and in this embodiment, are coated with paint.

[0043] The materials for the exterior material 44 and the interior material 45 are not particularly limited, and may be appropriately selected from materials for plastered walls such as plaster, siding materials, wood, wallpaper, and the like.

[0044] The ceiling section 5 is the part that will become the ceiling of the sauna house 1, and in this embodiment, is formed in the same oval shape as the floor section 3. This ceiling section 5 is made of wood, and has built-in or buried insulating material. The upper surface is inclined outward on the left and right sides, and is formed as a roof surface 51 from which rainwater, snow, etc. can easily slide off. This roof surface 51 is painted with a paint that allows snow to easily fall off as an exterior material, and is painted with a uniform paint as the interior material of the side wall section 4 as an interior material.

[0045] The interior material for the ceiling portion 5 is not particularly limited, and may be appropriately selected from materials for plastered walls such as plaster, siding materials, wood, wallpaper, and the like.

[0046] The heat source device 6 is a so-called sauna stove for heating a room, and in this embodiment, has an electric stove 61 equipped with an electric heater as an indoor unit, and a controller 62 as an outdoor unit that controls the power supply and temperature to the electric stove 61. As shown in Figures 2 and 3, the electric stove 61 is installed on the flame-retardant floor material 31, and the controller 62 is installed on the outer surface of the side wall portion 4.

[0047] The heat source device 6 is not limited to the electric stove 61, but may be a wood stove, a gas stove, or the like.

[0048] Next, a manufacturing method for the sauna house of this embodiment will be described.

[0049] The manufacturing method of the sauna house 1 of this embodiment is mainly a method for forming the side wall portion 4. Specifically, it includes a temporary frame forming step of forming a temporary frame 9, a metal core material installing step of installing a metal core material 41, an outer resin material applying step of applying an outer insulating resin material 43, a screw removing step of removing the intermediate screws 46, a temporary frame removing step of removing the temporary frame 9, and an inner resin material applying step of applying an inner insulating resin material 42.

[0050] 7, the temporary frame forming step is a process of forming a temporary frame 9 for installing a metal core material 41, and in this embodiment, the temporary frame 9 is formed along the outer periphery of the floor portion 3 from the upper surface of the floor portion 3 to the lower surface of the ceiling portion 5. The temporary frame 9 in this embodiment is formed by connecting square timber made of wood or the like into a rectangular frame shape, and a plurality of temporary frames 9 are arranged along the outer periphery of the floor portion 3 that follows the shape of the side wall portion 4.

[0051] The metal core installation step is a process of constructing a metal core 41 by placing a metal plate on the outside of the temporary frame 9, as shown in Figure 8. In this embodiment, the metal core 41 is installed so as to cover the outside of the temporary frame 9 other than the openings that will become the front door 7 and window 8.

[0052] Specifically, multiple metal plates that will become the metal core 41 are arranged so as to cover the outside of the temporary frame 9 from the side of the ceiling 5 to the side of the floor 3, and are fixed to the side of the ceiling 5 and the side of the floor 3 with screws 46. Furthermore, at intermediate positions between the upper and lower ends, the metal plates are fixed to each other with screws 46 as necessary.

[0053] The fixing of the metal core 41 to the temporary frame 9 and the like is not limited to the use of the screws 46, but may be performed by adhesive, double-sided tape, welding, or the like.

[0054] The outer resin material applying step is a process of applying an outer insulating resin material 43 to the outside of a metal core material 41, as shown in Figure 9. In this embodiment, the outer insulating resin material 43 is applied to the outside of the metal core material 41 using adhesive and screws 46.

[0055] 6, multiple grooves 431 for bending are formed on the inner surface of the outer insulating resin material 43, and adhesive is filled into the grooves 431 for bending, and the metal core material 41 is attached while bending along the metal core material 41. The groove widths on the left and right sides of the groove 431 provide a space that allows bending, allowing the metal core material 41 to be bent.

[0056] Since the bending groove 431 is formed to a depth equal to or greater than half the thickness of the outer insulating resin material 43, a large space can be secured and the reaction force that tries to return the outer insulating resin material 43 to a straight state when it is bent can be weakened. Therefore, the bending groove 431 allows the outer insulating resin material 43 to be easily bent along the curved metal core material 41. Furthermore, the adhesive filled in the bending groove 431 can maintain the curved shape of the outer insulating resin material 43 by hardening.

[0057] The outer insulating resin material 43 is screwed to the side surfaces of the floor 3 and ceiling 5, and also to the metal core material 41 at an intermediate position between them. The outer insulating resin material 43 is attached to the metal core material 41 with adhesive, but there is a risk that it will fall under its own weight until the adhesive hardens. Furthermore, the outer insulating resin material 43 is made easy to bend by the bending grooves 431 with respect to the curved metal core material 41, but there is a risk that it will peel off due to the reaction force that tries to return it to a straight state. Therefore, the outer insulating resin material 43 in this embodiment is fixed to the outside of the metal core material 41 with screws 46 as well as adhesive.

[0058] The screw removal step is a process of removing some of the screws 46 that have been fixing the outer insulating resin material 43. The screws 46 are made of metal and have good thermal conductivity, which reduces the insulating performance of the outer insulating resin material 43. Therefore, in the screw removal step, after the adhesive has hardened and the outer insulating resin material 43 has been fixed to the metal core material 41, some of the screws 46 are removed to prevent the deterioration of the insulating performance.

[0059] Specifically, of the multiple screws 46 fastening the outer insulating resin material 43, the middle screws 46 fastened to parts other than the floor section 3 and the ceiling section 5 are removed. In this embodiment, the middle screws 46 fastened to the floor section 3 and the ceiling section 5 other than the left and right corners of the outer insulating resin material 43 are also removed.

[0060] However, because the outer insulating resin material 43 is fixed with screws at least at the left and right corners of the floor 3 and ceiling 5, it will not fall even if the adhesive strength weakens and it peels off from the metal core 41. Also, because the adhesive filled in the curved groove 431 maintains the curved shape of the outer insulating resin material 43, even if the intermediate screw 46 is removed, the outer insulating resin material 43 will not return to a straight state.

[0061] 11, the temporary form removal step is a process of removing the temporary forms 9 from the metal core material 41, and in this embodiment, all of the temporary forms 9 installed inside the metal core material 41 are removed. At this time, the ceiling part 5 is supported by the metal core material 41 and the outer insulating resin material 43, and will not fall due to its own weight.

[0062] 12, the inner insulating resin material applying step is a process of applying the inner insulating resin material 42 to the inside of the metal core material 41, and in this embodiment, the inner insulating resin material 42 is applied to the inside of the metal core material 41 using butyl rubber 47. The inner insulating resin material 42 is supported by the floor portion 3, and the reaction force that tries to straighten the curved metal core material 41 is a force toward the metal core material 41, so that it is not necessarily required to fasten with screws, and even if screws are used, the number of screws can be small.

[0063] After the step of applying the inner insulating resin material, although not shown, the exterior and interior surfaces of the sauna house 1, including the side wall portion 4, are decorated with paint or the like, and the front door 7 and window 8 are installed to complete the sauna house 1.

[0064] According to the present embodiment as described above, the following effects can be obtained. 1. Since the side wall portion 4 is mainly formed from a foam-type insulating resin material, the entire sauna house 1 can be made lightweight, making it easier to transport and install. 2. The inner insulation is made of a high heat resistant insulation material that has a heat resistance of 80°C or more, and is also attached to the metal core 41 with butyl rubber 47, so that deformation due to thermal decomposition and the generation of VOCs can be suppressed even when used in temperatures of 80°C or more, such as in a dry sauna. In particular, by using phenol foam, high insulation performance and high heat resistance can be obtained. 3. By using not only a metal core material 41 and an outer insulating resin material 43 but also an inner insulating resin material 42 as the internal structure of the side wall portion 4, high insulation and moisture retention properties can be obtained and the tensile strength and compressive strength of the side wall portion 4 can be increased. In particular, by using bead-method polystyrene foam as the outer insulating resin material 43, high insulation performance and high compressive strength can be obtained at low cost. 4. At the rear position of the heat source device 6, the same high heat resistant insulating material as the inner insulating resin material 42 is used instead of the outer insulating resin material 43, so that even if the outer insulating resin material 43a at that location rises to an unintended temperature by the heat source device 6, deformation due to thermal decomposition, etc. and the generation of VOCs can be suppressed. 5. Since the side wall portion 4 can be formed in a curved shape, it can be formed in various shapes, such as an oval shape as in this embodiment, as well as a rectangular parallelepiped shape. 6. By using the temporary frame 9 in the manufacturing method of the sauna house, the side wall portion 4 can be formed simply and reliably. 7. By removing the screws 46 used when attaching the outer insulating resin material 43 to the outside of the metal core material 41 to a minimum, the insulating performance of the outer insulating resin material 43 can be maximized.

[0065] The sauna house and its manufacturing method according to the present invention are not limited to the above-mentioned embodiment, and can be modified as appropriate. For example, reinforcing materials such as square columns or pipes can be installed between the metal core material 41 and the inner insulating resin material 42 or between the metal core material 41 and the outer insulating resin material 43 to reinforce the side wall portion 4. [Explanation of symbols]

[0066] 1. Sauna House 2 Foundation part 3 Floor 4 Side wall 5 Ceiling 6 Heat source device 7. Entrance door 8. Windows 31 Flame-retardant flooring 32 Flooring materials 41 Metal core material 42 Inner insulation resin material 43 External insulation resin material 43a Insulating resin material 44 Exterior materials 45 Interior materials 46 Bis 47 Butyl rubber 431 Curved groove 51 Roof surface 61 Electric stove 62 Controller

Claims

1. A sauna house that is installed outdoors, The wall interior between the interior material and the exterior material in the side wall portion includes a metal core material formed of a metal plate, an inner insulating resin material attached to the inside of the metal core material, and an outer insulating resin material which is an insulating material different from the inner insulating resin material and is attached to the outside of the metal core material, The sauna house, wherein the inner insulating resin material is formed from a highly heat-resistant insulating material that has heat resistance to high temperatures of 80°C or higher.

2. 2. The sauna house according to claim 1, wherein the inner insulating resin material is formed of phenol foam and the outer insulating resin material is formed of bead-method polystyrene foam.

3. A sauna house as described in claim 1, wherein the insulating resin material attached to the outside of the metal core material on the side wall portion at the rear position of the heat source device installed in the sauna house is made of the same high heat resistant insulating material as the inner insulating resin material, rather than the outer insulating resin material.

4. The sauna house described in claim 1, wherein the outer insulating resin material of the side wall portion that is curved has a plurality of curving grooves formed in the left-right direction on its inner surface from the upper end to the lower end, the grooves having a depth of more than half the thickness of the outer insulating resin material, and the adhesive filled in the curving grooves is attached along the outside of the curved metal core material.

5. A method for manufacturing a sauna house, comprising: a provisional frame forming step of forming a provisional frame along an outer periphery of the floor portion from the floor portion to the ceiling portion; a metal core installation step of installing a metal core made of a metal plate material on the outer side of the temporary form; an outer resin material attaching step of attaching an outer insulating resin material to the outside of the metal core material and fastening the outer insulating resin material together with the metal core material to the floor portion, the ceiling portion, and intermediate portions thereof with a plurality of screws; a form removing step of removing the form from the metal core; an inner resin material attaching step of attaching an inner insulating resin material to the inside of the metal core material; A method for manufacturing the sauna house, comprising the steps of:

6. A method for manufacturing a sauna house as described in claim 5, further comprising a screw removal step of removing the screws in the middle portion of the multiple screws fastening the outer insulating resin material, leaving the screws in the floor and ceiling portions.

7. A method for manufacturing a sauna house as described in claim 5, wherein, when the outer insulating resin material is applied to the curved metal core in the outer resin material application step, a plurality of curving grooves having a depth of at least half the thickness of the outer insulating resin material are formed in the left-right direction on the inner surface of the outer insulating resin material from the upper end to the lower end, and adhesive is filled into the curving grooves and the outer surface of the metal core is applied while curving it along the outer surface.

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